From 71094c959aa259f5166c4d0466aed195492a1890 Mon Sep 17 00:00:00 2001
From: "abdul.rehman" <abdul.rehman@evampsaanga.com>
Date: Wed, 11 Sep 2019 14:44:37 +0500
Subject: [PATCH] RTL language support added

---
 Example/Base.lproj/Main.storyboard            |  68 +++--
 Example/PopupViewController.swift             |  19 ++
 Sources/Classes/ContentScrollView.swift       |  41 ++-
 Sources/Classes/SwipeMenuView.swift           | 285 ++++++++++--------
 Sources/Classes/SwipeMenuViewController.swift |  30 +-
 Sources/Classes/TabItemView.swift             |  22 +-
 Sources/Classes/TabView.swift                 | 239 ++++++++-------
 .../project.pbxproj                           |   6 +-
 8 files changed, 427 insertions(+), 283 deletions(-)

diff --git a/Example/Base.lproj/Main.storyboard b/Example/Base.lproj/Main.storyboard
index 3c3b591..a4f382f 100644
--- a/Example/Base.lproj/Main.storyboard
+++ b/Example/Base.lproj/Main.storyboard
@@ -1,11 +1,11 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="14109" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="BYZ-38-t0r">
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="14460.31" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="BYZ-38-t0r">
     <device id="retina4_7" orientation="portrait">
         <adaptation id="fullscreen"/>
     </device>
     <dependencies>
         <deployment identifier="iOS"/>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14088"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14460.20"/>
         <capability name="Safe area layout guides" minToolsVersion="9.0"/>
         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
     </dependencies>
@@ -67,19 +67,19 @@
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                         <subviews>
                             <view tag="2" contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="VOm-Qd-6BU">
-                                <rect key="frame" x="27" y="20" width="320" height="627"/>
+                                <rect key="frame" x="27" y="20" width="321" height="627"/>
                                 <subviews>
                                     <stackView opaque="NO" contentMode="scaleToFill" axis="vertical" spacing="8" translatesAutoresizingMaskIntoConstraints="NO" id="iBq-WB-ocX">
-                                        <rect key="frame" x="8" y="8" width="304" height="611"/>
+                                        <rect key="frame" x="8" y="8" width="305" height="611"/>
                                         <subviews>
                                             <scrollView clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleToFill" showsHorizontalScrollIndicator="NO" showsVerticalScrollIndicator="NO" translatesAutoresizingMaskIntoConstraints="NO" id="wBh-tP-IIN">
-                                                <rect key="frame" x="0.0" y="0.0" width="304" height="535"/>
+                                                <rect key="frame" x="0.0" y="0.0" width="305" height="535"/>
                                                 <subviews>
                                                     <stackView opaque="NO" contentMode="scaleToFill" axis="vertical" distribution="fillEqually" alignment="center" spacing="3" translatesAutoresizingMaskIntoConstraints="NO" id="2b2-xK-eWv">
-                                                        <rect key="frame" x="0.0" y="0.0" width="304" height="459"/>
+                                                        <rect key="frame" x="0.0" y="0.0" width="305" height="525"/>
                                                         <subviews>
                                                             <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Page Number : 3" textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="bP3-4H-lAe">
-                                                                <rect key="frame" x="101.5" y="0.0" width="101.5" height="30"/>
+                                                                <rect key="frame" x="102" y="0.0" width="101.5" height="30"/>
                                                                 <constraints>
                                                                     <constraint firstAttribute="height" constant="30" id="glZ-5h-puU"/>
                                                                 </constraints>
@@ -88,14 +88,14 @@
                                                                 <nil key="highlightedColor"/>
                                                             </label>
                                                             <stepper opaque="NO" contentMode="scaleToFill" horizontalHuggingPriority="750" verticalHuggingPriority="750" contentHorizontalAlignment="center" contentVerticalAlignment="center" value="5" maximumValue="8" translatesAutoresizingMaskIntoConstraints="NO" id="jjB-JY-9YU">
-                                                                <rect key="frame" x="105" y="33" width="94" height="29"/>
+                                                                <rect key="frame" x="105.5" y="33" width="94" height="29"/>
                                                                 <color key="tintColor" white="0.0" alpha="1" colorSpace="calibratedWhite"/>
                                                                 <connections>
                                                                     <action selector="changeDataCount:" destination="Cbb-L4-MOy" eventType="touchUpInside" id="Pe6-zy-gvJ"/>
                                                                 </connections>
                                                             </stepper>
                                                             <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Tab Margin" textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="fsO-V6-A6a">
-                                                                <rect key="frame" x="118.5" y="66" width="67" height="30"/>
+                                                                <rect key="frame" x="119" y="66" width="67" height="30"/>
                                                                 <constraints>
                                                                     <constraint firstAttribute="height" constant="30" id="Ooj-pU-xRe"/>
                                                                 </constraints>
@@ -104,7 +104,7 @@
                                                                 <nil key="highlightedColor"/>
                                                             </label>
                                                             <slider opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" minValue="0.0" maxValue="20" translatesAutoresizingMaskIntoConstraints="NO" id="jJV-1d-tfh">
-                                                                <rect key="frame" x="20.5" y="99" width="263" height="31"/>
+                                                                <rect key="frame" x="21" y="99" width="263" height="31"/>
                                                                 <constraints>
                                                                     <constraint firstAttribute="width" constant="259" id="vX7-4e-MeW"/>
                                                                 </constraints>
@@ -114,7 +114,7 @@
                                                                 </connections>
                                                             </slider>
                                                             <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Style" textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="zTD-Nr-aHx">
-                                                                <rect key="frame" x="137" y="132" width="30.5" height="30"/>
+                                                                <rect key="frame" x="137.5" y="132" width="30.5" height="30"/>
                                                                 <constraints>
                                                                     <constraint firstAttribute="height" constant="30" id="Lw8-Ac-13t"/>
                                                                 </constraints>
@@ -123,7 +123,7 @@
                                                                 <nil key="highlightedColor"/>
                                                             </label>
                                                             <segmentedControl opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="left" contentVerticalAlignment="top" segmentControlStyle="plain" selectedSegmentIndex="0" translatesAutoresizingMaskIntoConstraints="NO" id="kcj-NS-rtY">
-                                                                <rect key="frame" x="22.5" y="165" width="259" height="31"/>
+                                                                <rect key="frame" x="23" y="165" width="259" height="31"/>
                                                                 <constraints>
                                                                     <constraint firstAttribute="width" relation="greaterThanOrEqual" constant="259" id="IDq-U5-mVH"/>
                                                                 </constraints>
@@ -137,7 +137,7 @@
                                                                 </connections>
                                                             </segmentedControl>
                                                             <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Tab Addition" textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="Zix-he-J3b">
-                                                                <rect key="frame" x="114" y="198" width="76" height="30"/>
+                                                                <rect key="frame" x="114.5" y="198" width="76" height="30"/>
                                                                 <constraints>
                                                                     <constraint firstAttribute="height" constant="30" id="jjZ-rb-wyz"/>
                                                                 </constraints>
@@ -146,7 +146,7 @@
                                                                 <nil key="highlightedColor"/>
                                                             </label>
                                                             <segmentedControl opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="left" contentVerticalAlignment="top" segmentControlStyle="plain" selectedSegmentIndex="0" translatesAutoresizingMaskIntoConstraints="NO" id="Lm5-Dk-QNp">
-                                                                <rect key="frame" x="22.5" y="231" width="259" height="31"/>
+                                                                <rect key="frame" x="23" y="231" width="259" height="31"/>
                                                                 <constraints>
                                                                     <constraint firstAttribute="width" relation="greaterThanOrEqual" constant="259" id="zgd-EH-y9F"/>
                                                                 </constraints>
@@ -161,7 +161,7 @@
                                                                 </connections>
                                                             </segmentedControl>
                                                             <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Adjust Tab Item Width" textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="avh-1H-pWf">
-                                                                <rect key="frame" x="85.5" y="264" width="133.5" height="30"/>
+                                                                <rect key="frame" x="86" y="264" width="133.5" height="30"/>
                                                                 <constraints>
                                                                     <constraint firstAttribute="height" constant="30" id="IRM-l3-5As"/>
                                                                 </constraints>
@@ -170,7 +170,7 @@
                                                                 <nil key="highlightedColor"/>
                                                             </label>
                                                             <segmentedControl opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="left" contentVerticalAlignment="top" segmentControlStyle="plain" selectedSegmentIndex="0" translatesAutoresizingMaskIntoConstraints="NO" id="Bin-QX-LTN">
-                                                                <rect key="frame" x="22.5" y="297" width="259" height="31"/>
+                                                                <rect key="frame" x="23" y="297" width="259" height="31"/>
                                                                 <constraints>
                                                                     <constraint firstAttribute="width" relation="greaterThanOrEqual" constant="259" id="yWI-wM-SWg"/>
                                                                 </constraints>
@@ -184,7 +184,7 @@
                                                                 </connections>
                                                             </segmentedControl>
                                                             <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Tab Item Width: 100" textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="3HF-bf-90C">
-                                                                <rect key="frame" x="91.5" y="330" width="121" height="30"/>
+                                                                <rect key="frame" x="92" y="330" width="121" height="30"/>
                                                                 <constraints>
                                                                     <constraint firstAttribute="height" constant="30" id="x5w-fL-zWC"/>
                                                                 </constraints>
@@ -193,7 +193,7 @@
                                                                 <nil key="highlightedColor"/>
                                                             </label>
                                                             <slider opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" value="100" minValue="80" maxValue="300" translatesAutoresizingMaskIntoConstraints="NO" id="OQQ-jm-h8c">
-                                                                <rect key="frame" x="20.5" y="363" width="263" height="31"/>
+                                                                <rect key="frame" x="21" y="363" width="263" height="31"/>
                                                                 <constraints>
                                                                     <constraint firstAttribute="width" constant="259" id="5T1-Rk-EIM"/>
                                                                 </constraints>
@@ -203,7 +203,7 @@
                                                                 </connections>
                                                             </slider>
                                                             <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Content Scroll View Scroll Enable" textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="T1z-oP-t7V">
-                                                                <rect key="frame" x="51.5" y="396" width="201" height="30"/>
+                                                                <rect key="frame" x="52" y="396" width="201" height="30"/>
                                                                 <constraints>
                                                                     <constraint firstAttribute="height" constant="30" id="FaN-Ek-XhA"/>
                                                                 </constraints>
@@ -212,7 +212,7 @@
                                                                 <nil key="highlightedColor"/>
                                                             </label>
                                                             <segmentedControl opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="left" contentVerticalAlignment="top" segmentControlStyle="plain" selectedSegmentIndex="0" translatesAutoresizingMaskIntoConstraints="NO" id="lO2-uE-mds">
-                                                                <rect key="frame" x="22.5" y="429" width="259" height="31"/>
+                                                                <rect key="frame" x="23" y="429" width="259" height="31"/>
                                                                 <constraints>
                                                                     <constraint firstAttribute="width" relation="greaterThanOrEqual" constant="259" id="Ok0-kA-Aid"/>
                                                                 </constraints>
@@ -225,6 +225,29 @@
                                                                     <action selector="changeContentScrollEnabled:" destination="Cbb-L4-MOy" eventType="valueChanged" id="6sd-ka-rFk"/>
                                                                 </connections>
                                                             </segmentedControl>
+                                                            <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Language direction" textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="Ydt-2q-4az">
+                                                                <rect key="frame" x="94.5" y="462" width="116.5" height="30"/>
+                                                                <constraints>
+                                                                    <constraint firstAttribute="height" constant="30" id="Z8V-Mk-09H"/>
+                                                                </constraints>
+                                                                <fontDescription key="fontDescription" type="system" pointSize="13"/>
+                                                                <nil key="textColor"/>
+                                                                <nil key="highlightedColor"/>
+                                                            </label>
+                                                            <segmentedControl opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="left" contentVerticalAlignment="top" segmentControlStyle="plain" selectedSegmentIndex="0" translatesAutoresizingMaskIntoConstraints="NO" id="A2k-P8-gXC">
+                                                                <rect key="frame" x="23" y="495" width="259" height="31"/>
+                                                                <constraints>
+                                                                    <constraint firstAttribute="width" relation="greaterThanOrEqual" constant="259" id="lyo-M6-ayI"/>
+                                                                </constraints>
+                                                                <segments>
+                                                                    <segment title="LTR"/>
+                                                                    <segment title="RTL"/>
+                                                                </segments>
+                                                                <color key="tintColor" white="0.0" alpha="1" colorSpace="calibratedWhite"/>
+                                                                <connections>
+                                                                    <action selector="changeLanguageDirection:" destination="Cbb-L4-MOy" eventType="valueChanged" id="VaQ-2h-vnb"/>
+                                                                </connections>
+                                                            </segmentedControl>
                                                         </subviews>
                                                     </stackView>
                                                 </subviews>
@@ -237,7 +260,7 @@
                                                 </constraints>
                                             </scrollView>
                                             <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="KIZ-Qs-33a">
-                                                <rect key="frame" x="0.0" y="543" width="304" height="30"/>
+                                                <rect key="frame" x="0.0" y="543" width="305" height="30"/>
                                                 <constraints>
                                                     <constraint firstAttribute="height" constant="30" id="lPB-HP-0xA"/>
                                                 </constraints>
@@ -261,7 +284,7 @@
                                                 </connections>
                                             </button>
                                             <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="uSd-pz-0mn">
-                                                <rect key="frame" x="0.0" y="581" width="304" height="30"/>
+                                                <rect key="frame" x="0.0" y="581" width="305" height="30"/>
                                                 <constraints>
                                                     <constraint firstAttribute="height" constant="30" id="beg-tR-TqM"/>
                                                 </constraints>
@@ -316,6 +339,7 @@
                         <outlet property="contentScrolEnabledSegmentedControl" destination="lO2-uE-mds" id="akJ-rJ-DT3"/>
                         <outlet property="dataCountLabel" destination="bP3-4H-lAe" id="1z3-kV-q3p"/>
                         <outlet property="dataCountStepper" destination="jjB-JY-9YU" id="GhZ-HR-Ng1"/>
+                        <outlet property="languageDirectionSegmentedControl" destination="A2k-P8-gXC" id="A8i-RJ-UmY"/>
                         <outlet property="styleSegmentedControl" destination="kcj-NS-rtY" id="GwN-dc-p3e"/>
                         <outlet property="tabAdditionSegmentedControl" destination="Lm5-Dk-QNp" id="rO2-ut-VCw"/>
                         <outlet property="tabItemViewWidthLabel" destination="3HF-bf-90C" id="Yn8-IQ-myX"/>
diff --git a/Example/PopupViewController.swift b/Example/PopupViewController.swift
index 8af5088..a09159e 100644
--- a/Example/PopupViewController.swift
+++ b/Example/PopupViewController.swift
@@ -39,6 +39,7 @@ class PopupViewController: UIViewController {
     @IBOutlet weak var tabItemViewWidthSlider: UISlider!
     @IBOutlet weak var tabAdditionSegmentedControl: UISegmentedControl!
     @IBOutlet weak var contentScrolEnabledSegmentedControl: UISegmentedControl!
+    @IBOutlet weak var languageDirectionSegmentedControl: UISegmentedControl!
 
     override func viewDidLoad() {
         super.viewDidLoad()
@@ -88,6 +89,12 @@ class PopupViewController: UIViewController {
         } else {
             contentScrolEnabledSegmentedControl.selectedSegmentIndex = 1
         }
+        
+        if options.isLanguageRTL {
+            languageDirectionSegmentedControl.selectedSegmentIndex = 1
+        } else {
+            languageDirectionSegmentedControl.selectedSegmentIndex = 0
+        }
     }
     
     override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
@@ -196,4 +203,16 @@ class PopupViewController: UIViewController {
             break
         }
     }
+   
+    @IBAction func changeLanguageDirection(_ sender: UISegmentedControl) {
+        
+        switch sender.selectedSegmentIndex {
+        case 0:
+            options.isLanguageRTL = false
+        case 1:
+            options.isLanguageRTL = true
+        default:
+            break
+        }
+    }
 }
diff --git a/Sources/Classes/ContentScrollView.swift b/Sources/Classes/ContentScrollView.swift
index 9bc8a3a..a425e60 100644
--- a/Sources/Classes/ContentScrollView.swift
+++ b/Sources/Classes/ContentScrollView.swift
@@ -1,5 +1,6 @@
 import UIKit
 
+// MARK: - ContentScrollViewDataSource
 public protocol ContentScrollViewDataSource {
 
     func numberOfPages(in contentScrollView: ContentScrollView) -> Int
@@ -7,6 +8,7 @@ public protocol ContentScrollViewDataSource {
     func contentScrollView(_ contentScrollView: ContentScrollView, viewForPageAt index: Int) -> UIView?
 }
 
+// MARK: - ContentScrollView
 open class ContentScrollView: UIScrollView {
 
     open var dataSource: ContentScrollViewDataSource?
@@ -48,6 +50,7 @@ open class ContentScrollView: UIScrollView {
     public func reset() {
         pageViews = []
         currentIndex = 0
+        self.subviews.forEach({ $0.removeFromSuperview() })
     }
 
     public func reload() {
@@ -57,6 +60,16 @@ open class ContentScrollView: UIScrollView {
     public func update(_ newIndex: Int) {
         currentIndex = newIndex
     }
+    
+    func updateSemantic() {
+        if #available(iOS 9.0, *) {
+            if options.isLanguageRTL {
+                self.semanticContentAttribute = .forceRightToLeft
+            } else {
+                self.semanticContentAttribute = .forceLeftToRight
+            }
+        }
+    }
 
     // MARK: - Setup
 
@@ -102,23 +115,38 @@ open class ContentScrollView: UIScrollView {
                 pageView.widthAnchor.constraint(equalTo: self.widthAnchor),
                 pageView.heightAnchor.constraint(equalTo: self.heightAnchor),
                 pageView.leadingAnchor.constraint(equalTo: leadingAnchor)
-            ])
+                ])
         }
 
         guard currentIndex < dataSource.numberOfPages(in: self) else { return }
+        
+        var lastPageView :UIView?
+        
         for i in (currentIndex + 1)..<dataSource.numberOfPages(in: self) {
             guard let pageView = dataSource.contentScrollView(self, viewForPageAt: i) else { return }
             pageViews.append(pageView)
             addSubview(pageView)
 
             pageView.translatesAutoresizingMaskIntoConstraints = false
+            
+            lastPageView = pageView
+            
             NSLayoutConstraint.activate([
                 pageView.topAnchor.constraint(equalTo: self.topAnchor),
                 pageView.widthAnchor.constraint(equalTo: self.widthAnchor),
                 pageView.heightAnchor.constraint(equalTo: self.heightAnchor),
                 pageView.leadingAnchor.constraint(equalTo: pageViews[i - 1].trailingAnchor)
-            ])
+                ])
         }
+        
+        
+        if let lastView = lastPageView {
+            NSLayoutConstraint.activate([
+                lastView.trailingAnchor.constraint(equalTo: self.trailingAnchor)
+                ])
+        }
+        
+        
     }
 }
 
@@ -153,6 +181,13 @@ extension ContentScrollView {
 
     public func jump(to index: Int, animated: Bool) {
         update(index)
-        self.setContentOffset(CGPoint(x: self.frame.width * CGFloat(currentIndex), y: 0), animated: animated)
+        
+        if options.isLanguageRTL {
+            self.setContentOffset(CGPoint(x: self.frame.width * CGFloat((pageViews.count - 1) - currentIndex), y: 0), animated: animated)
+        } else {
+            self.setContentOffset(CGPoint(x: self.frame.width * CGFloat(currentIndex), y: 0), animated: animated)
+        }
+        
+        
     }
 }
diff --git a/Sources/Classes/SwipeMenuView.swift b/Sources/Classes/SwipeMenuView.swift
index 113a574..d41c32b 100644
--- a/Sources/Classes/SwipeMenuView.swift
+++ b/Sources/Classes/SwipeMenuView.swift
@@ -2,41 +2,41 @@ import UIKit
 
 // MARK: - SwipeMenuViewOptions
 public struct SwipeMenuViewOptions {
-
+    
     public struct TabView {
-
+        
         public enum Style {
             case flexible
             case segmented
             // TODO: case infinity
         }
-
+        
         public enum Addition {
             case underline
             case circle
             case none
         }
-
+        
         public struct ItemView {
             /// ItemView width. Defaults to `100.0`.
             public var width: CGFloat = 100.0
-
+            
             /// ItemView side margin. Defaults to `5.0`.
             public var margin: CGFloat = 5.0
-
+            
             /// ItemView font. Defaults to `14 pt as bold SystemFont`.
             public var font: UIFont = UIFont.boldSystemFont(ofSize: 14)
-
+            
             /// ItemView clipsToBounds. Defaults to `true`.
             public var clipsToBounds: Bool = true
-
+            
             /// ItemView textColor. Defaults to `.lightGray`.
             public var textColor: UIColor = UIColor(red: 170 / 255, green: 170 / 255, blue: 170 / 255, alpha: 1.0)
-
+            
             /// ItemView selected textColor. Defaults to `.black`.
             public var selectedTextColor: UIColor = UIColor(red: 0.0, green: 0.0, blue: 0.0, alpha: 1.0)
         }
-
+        
         public struct AdditionView {
             
             public struct Underline {
@@ -49,11 +49,11 @@ public struct SwipeMenuViewOptions {
                 /// `AdditionView.height / 2` in the case of nil.
                 public var cornerRadius: CGFloat? = nil
             }
-
+            
             /// AdditionView side margin. Defaults to `0.0`.
             @available(*, deprecated, message: "Use `SwipeMenuViewOptions.TabView.AdditionView.padding` instead.")
             public var margin: CGFloat = 0.0
-
+            
             /// AdditionView paddings. Defaults to `.zero`.
             public var padding: UIEdgeInsets = .zero
             
@@ -62,65 +62,71 @@ public struct SwipeMenuViewOptions {
             
             /// AdditionView animating duration. Defaults to `0.3`.
             public var animationDuration: Double = 0.3
-
+            
             /// Underline style options.
             public var underline = Underline()
             
             /// Circle style options.
             public var circle = Circle()
         }
-
+        
         /// TabView height. Defaults to `44.0`.
         public var height: CGFloat = 44.0
-
+        
         /// TabView side margin. Defaults to `0.0`.
         public var margin: CGFloat = 0.0
-
+        
         /// TabView background color. Defaults to `.clear`.
         public var backgroundColor: UIColor = .clear
-
+        
         /// TabView clipsToBounds. Defaults to `true`.
         public var clipsToBounds: Bool = true
-
+        
         /// TabView style. Defaults to `.flexible`. Style type has [`.flexible` , `.segmented`].
         public var style: Style = .flexible
-
+        
         /// TabView addition. Defaults to `.underline`. Addition type has [`.underline`, `.circle`, `.none`].
         public var addition: Addition = .underline
-
+        
         /// TabView adjust width or not. Defaults to `true`.
         public var needsAdjustItemViewWidth: Bool = true
-
+        
         /// Convert the text color of ItemView to selected text color by scroll rate of ContentScrollView. Defaults to `true`.
         public var needsConvertTextColorRatio: Bool = true
-
+        
         /// TabView enable safeAreaLayout. Defaults to `true`.
         public var isSafeAreaEnabled: Bool = true
-
+        
+        /// isLanguageRTL set scroll direction. Defaults to `false`.
+        public var isLanguageRTL : Bool  = false
+        
         /// ItemView options
         public var itemView = ItemView()
-
+        
         /// AdditionView options
         public var additionView = AdditionView()
-
+        
         public init() { }
     }
-
+    
     public struct ContentScrollView {
-
+        
         /// ContentScrollView backgroundColor. Defaults to `.clear`.
         public var backgroundColor: UIColor = .clear
-
+        
         /// ContentScrollView clipsToBounds. Defaults to `true`.
         public var clipsToBounds: Bool = true
-
+        
         /// ContentScrollView scroll enabled. Defaults to `true`.
         public var isScrollEnabled: Bool = true
-
+        
         /// ContentScrollView enable safeAreaLayout. Defaults to `true`.
         public var isSafeAreaEnabled: Bool = true
+        
+        /// isLanguageRTL set scroll direction. Defaults to `false`.
+        public var isLanguageRTL : Bool  = false
     }
-
+    
     /// TabView and ContentScrollView Enable safeAreaLayout. Defaults to `true`.
     public var isSafeAreaEnabled: Bool = true {
         didSet {
@@ -128,29 +134,37 @@ public struct SwipeMenuViewOptions {
             contentScrollView.isSafeAreaEnabled = isSafeAreaEnabled
         }
     }
-
+    
+    /// isLanguageRTL set scroll direction. Defaults to `false`.
+    public var isLanguageRTL : Bool  = false {
+        didSet {
+            tabView.isLanguageRTL = isLanguageRTL
+            contentScrollView.isLanguageRTL = isLanguageRTL
+        }
+    }
+    
     /// TabView options
     public var tabView = TabView()
-
+    
     /// ContentScrollView options
     public var contentScrollView = ContentScrollView()
-
+    
     public init() { }
 }
 
 // MARK: - SwipeMenuViewDelegate
 
 public protocol SwipeMenuViewDelegate: class {
-
+    
     /// Called before setup self.
     func swipeMenuView(_ swipeMenuView: SwipeMenuView, viewWillSetupAt currentIndex: Int)
-
+    
     /// Called after setup self.
     func swipeMenuView(_ swipeMenuView: SwipeMenuView, viewDidSetupAt currentIndex: Int)
-
+    
     /// Called before swiping the page.
     func swipeMenuView(_ swipeMenuView: SwipeMenuView, willChangeIndexFrom fromIndex: Int, to toIndex: Int)
-
+    
     /// Called after swiping the page.
     func swipeMenuView(_ swipeMenuView: SwipeMenuView, didChangeIndexFrom fromIndex: Int, to toIndex: Int)
 }
@@ -165,13 +179,13 @@ extension SwipeMenuViewDelegate {
 // MARK: - SwipeMenuViewDataSource
 
 public protocol SwipeMenuViewDataSource: class {
-
+    
     /// Return the number of pages in `SwipeMenuView`.
     func numberOfPages(in swipeMenuView: SwipeMenuView) -> Int
-
+    
     /// Return strings to be displayed at the tab in `SwipeMenuView`.
     func swipeMenuView(_ swipeMenuView: SwipeMenuView, titleForPageAt index: Int) -> String
-
+    
     /// Return a ViewController to be displayed at the page in `SwipeMenuView`.
     func swipeMenuView(_ swipeMenuView: SwipeMenuView, viewControllerForPageAt index: Int) -> UIViewController
 }
@@ -179,13 +193,13 @@ public protocol SwipeMenuViewDataSource: class {
 // MARK: - SwipeMenuView
 
 open class SwipeMenuView: UIView {
-
+    
     /// An object conforms `SwipeMenuViewDelegate`. Provide views to populate the `SwipeMenuView`.
     open weak var delegate: SwipeMenuViewDelegate?
-
+    
     /// An object conforms `SwipeMenuViewDataSource`. Provide views and respond to `SwipeMenuView` events.
     open weak var dataSource: SwipeMenuViewDataSource?
-
+    
     open fileprivate(set) var tabView: TabView? {
         didSet {
             guard let tabView = tabView else { return }
@@ -195,7 +209,7 @@ open class SwipeMenuView: UIView {
             layout(tabView: tabView)
         }
     }
-
+    
     open fileprivate(set) var contentScrollView: ContentScrollView? {
         didSet {
             guard let contentScrollView = contentScrollView else { return }
@@ -205,72 +219,72 @@ open class SwipeMenuView: UIView {
             layout(contentScrollView: contentScrollView)
         }
     }
-
+    
     public var options: SwipeMenuViewOptions
-
+    
     fileprivate var isLayoutingSubviews: Bool = false
-
+    
     fileprivate var pageCount: Int {
         return dataSource?.numberOfPages(in: self) ?? 0
     }
-
+    
     fileprivate var isJumping: Bool = false
     fileprivate var isPortrait: Bool = true
-
+    
     /// The index of the front page in `SwipeMenuView` (read only).
     open private(set) var currentIndex: Int = 0
     private var jumpingToIndex: Int?
-
+    
     public init(frame: CGRect, options: SwipeMenuViewOptions? = nil) {
-
+        
         if let options = options {
             self.options = options
         } else {
             self.options = .init()
         }
-
+        
         super.init(frame: frame)
     }
-
+    
     public required init?(coder aDecoder: NSCoder) {
-
+        
         self.options = .init()
-
+        
         super.init(coder: aDecoder)
     }
-
+    
     open override func layoutSubviews() {
-
+        
         isLayoutingSubviews = true
         super.layoutSubviews()
         reloadData(isOrientationChange: true)
     }
-
+    
     open override func didMoveToSuperview() {
         super.didMoveToSuperview()
-
+        
         setup()
     }
-
+    
     /// Reloads all `SwipeMenuView` item views with the dataSource and refreshes the display.
     public func reloadData(options: SwipeMenuViewOptions? = nil, default defaultIndex: Int? = nil, isOrientationChange: Bool = false) {
-
+        
         if let options = options {
             self.options = options
         }
-
+        
         isLayoutingSubviews = isOrientationChange
-
+        
         if !isLayoutingSubviews {
             reset()
             setup(default: defaultIndex ?? currentIndex)
         }
-
+        
         jump(to: defaultIndex ?? currentIndex, animated: false)
-
+        
         isLayoutingSubviews = false
     }
-
+    
     /// Jump to the selected page.
     public func jump(to index: Int, animated: Bool) {
         guard let tabView = tabView, let contentScrollView = contentScrollView else { return }
@@ -278,59 +292,65 @@ open class SwipeMenuView: UIView {
             delegate?.swipeMenuView(self, willChangeIndexFrom: currentIndex, to: index)
         }
         jumpingToIndex = index
-
+        
         tabView.jump(to: index)
         contentScrollView.jump(to: index, animated: animated)
     }
-
+    
     /// Notify changing orientaion to `SwipeMenuView` before it.
     public func willChangeOrientation() {
         isLayoutingSubviews = true
         setNeedsLayout()
     }
-
+    
     fileprivate func update(from fromIndex: Int, to toIndex: Int) {
-
+        
         if !isLayoutingSubviews {
             delegate?.swipeMenuView(self, willChangeIndexFrom: fromIndex, to: toIndex)
         }
-
+        
         tabView?.update(toIndex)
         contentScrollView?.update(toIndex)
         if !isJumping {
             // delay setting currentIndex until end scroll when jumping
             currentIndex = toIndex
         }
-
+        
         if !isJumping && !isLayoutingSubviews {
             delegate?.swipeMenuView(self, didChangeIndexFrom: fromIndex, to: toIndex)
         }
     }
-
+    
     // MARK: - Setup
     private func setup(default defaultIndex: Int = 0) {
-
+        
         delegate?.swipeMenuView(self, viewWillSetupAt: defaultIndex)
-
+        
         backgroundColor = .clear
-
+        
         tabView = TabView(frame: CGRect(x: 0, y: 0, width: frame.width, height: options.tabView.height), options: options.tabView)
+        
+        tabView?.updateSemantic()
+        
         tabView?.clipsToBounds = options.tabView.clipsToBounds
-
+        
         contentScrollView = ContentScrollView(frame: CGRect(x: 0, y: options.tabView.height, width: frame.width, height: frame.height - options.tabView.height), default: defaultIndex, options: options.contentScrollView)
+        
+        contentScrollView?.updateSemantic()
+        
         contentScrollView?.clipsToBounds = options.contentScrollView.clipsToBounds
-
+        
         tabView?.update(defaultIndex)
         contentScrollView?.update(defaultIndex)
         currentIndex = defaultIndex
-
+        
         delegate?.swipeMenuView(self, viewDidSetupAt: defaultIndex)
     }
-
+    
     private func layout(tabView: TabView) {
-
+        
         tabView.translatesAutoresizingMaskIntoConstraints = false
-
+        
         NSLayoutConstraint.activate([
             tabView.topAnchor.constraint(equalTo: self.topAnchor),
             tabView.leadingAnchor.constraint(equalTo: self.leadingAnchor),
@@ -338,11 +358,11 @@ open class SwipeMenuView: UIView {
             tabView.heightAnchor.constraint(equalToConstant: options.tabView.height)
             ])
     }
-
+    
     private func layout(contentScrollView: ContentScrollView) {
-
+        
         contentScrollView.translatesAutoresizingMaskIntoConstraints = false
-
+        
         NSLayoutConstraint.activate([
             contentScrollView.topAnchor.constraint(equalTo: self.topAnchor, constant: options.tabView.height),
             contentScrollView.leadingAnchor.constraint(equalTo: self.leadingAnchor),
@@ -350,13 +370,13 @@ open class SwipeMenuView: UIView {
             contentScrollView.bottomAnchor.constraint(equalTo: self.bottomAnchor)
             ])
     }
-
+    
     private func reset() {
-
+        
         if !isLayoutingSubviews {
             currentIndex = 0
         }
-
+        
         if let tabView = tabView, let contentScrollView = contentScrollView {
             tabView.removeFromSuperview()
             contentScrollView.removeFromSuperview()
@@ -369,24 +389,24 @@ open class SwipeMenuView: UIView {
 // MARK: - TabViewDelegate, TabViewDataSource
 
 extension SwipeMenuView: TabViewDelegate, TabViewDataSource {
-
+    
     public func tabView(_ tabView: TabView, didSelectTabAt index: Int) {
-
+        
         guard let contentScrollView = contentScrollView,
             currentIndex != index else { return }
-
+        
         isJumping = true
         jumpingToIndex = index
-
+        
         contentScrollView.jump(to: index, animated: true)
-
+        
         update(from: currentIndex, to: index)
     }
-
+    
     public func numberOfItems(in menuView: TabView) -> Int {
         return dataSource?.numberOfPages(in: self) ?? 0
     }
-
+    
     public func tabView(_ tabView: TabView, titleForItemAt index: Int) -> String? {
         return dataSource?.swipeMenuView(self, titleForPageAt: index)
     }
@@ -395,23 +415,33 @@ extension SwipeMenuView: TabViewDelegate, TabViewDataSource {
 // MARK: - UIScrollViewDelegate
 
 extension SwipeMenuView: UIScrollViewDelegate {
-
+    
     public func scrollViewDidScroll(_ scrollView: UIScrollView) {
-
+        
         if isJumping || isLayoutingSubviews { return }
-
+        
         // update currentIndex
-        if scrollView.contentOffset.x >= frame.width * CGFloat(currentIndex + 1) {
-            update(from: currentIndex, to: currentIndex + 1)
-        } else if scrollView.contentOffset.x <= frame.width * CGFloat(currentIndex - 1) {
-            update(from: currentIndex, to: currentIndex - 1)
+        
+        
+        if options.isLanguageRTL {
+            if scrollView.contentOffset.x >= frame.width * CGFloat(((pageCount - 1) - currentIndex) + 1) {
+                update(from: currentIndex, to: currentIndex - 1)
+            } else if scrollView.contentOffset.x <= frame.width * CGFloat(((pageCount - 1) - currentIndex) - 1) {
+                update(from: currentIndex, to: currentIndex + 1)
+            }
+        } else {
+            if scrollView.contentOffset.x >= frame.width * CGFloat(currentIndex + 1) {
+                update(from: currentIndex, to: currentIndex + 1)
+            } else if scrollView.contentOffset.x <= frame.width * CGFloat(currentIndex - 1) {
+                update(from: currentIndex, to: currentIndex - 1)
+            }
         }
-
+        
         updateTabViewAddition(by: scrollView)
     }
-
+    
     public func scrollViewDidEndScrollingAnimation(_ scrollView: UIScrollView) {
-
+        
         if isJumping || isLayoutingSubviews {
             if let toIndex = jumpingToIndex {
                 delegate?.swipeMenuView(self, didChangeIndexFrom: currentIndex, to: toIndex)
@@ -422,29 +452,42 @@ extension SwipeMenuView: UIScrollViewDelegate {
             isLayoutingSubviews = false
             return
         }
-
+        
         updateTabViewAddition(by: scrollView)
     }
-
+    
     /// update addition in tab view
     private func updateTabViewAddition(by scrollView: UIScrollView) {
         moveAdditionView(scrollView: scrollView)
     }
-
+    
     /// update underbar position
     private func moveAdditionView(scrollView: UIScrollView) {
-
+        
         if let tabView = tabView, let contentScrollView = contentScrollView {
-
+            
             let ratio = scrollView.contentOffset.x.truncatingRemainder(dividingBy: contentScrollView.frame.width) / contentScrollView.frame.width
-
-            switch scrollView.contentOffset.x {
-            case let offset where offset >= frame.width * CGFloat(currentIndex):
-                tabView.moveAdditionView(index: currentIndex, ratio: ratio, direction: .forward)
-            case let offset where offset < frame.width * CGFloat(currentIndex):
-                tabView.moveAdditionView(index: currentIndex, ratio: ratio, direction: .reverse)
-            default:
-                break
+            
+            if options.isLanguageRTL {
+                
+                switch scrollView.contentOffset.x {
+                case let offset where offset >= frame.width * CGFloat((pageCount - 1) - currentIndex):
+                    tabView.moveAdditionView(index: currentIndex, ratio: ratio, direction: .reverse)
+                case let offset where offset < frame.width * CGFloat((pageCount - 1) - currentIndex):
+                    tabView.moveAdditionView(index: currentIndex, ratio: ratio, direction: .forward)
+                default:
+                    break
+                }
+                
+            } else {
+                switch scrollView.contentOffset.x {
+                case let offset where offset >= frame.width * CGFloat(currentIndex):
+                    tabView.moveAdditionView(index: currentIndex, ratio: ratio, direction: .forward)
+                case let offset where offset < frame.width * CGFloat(currentIndex):
+                    tabView.moveAdditionView(index: currentIndex, ratio: ratio, direction: .reverse)
+                default:
+                    break
+                }
             }
         }
     }
@@ -453,11 +496,11 @@ extension SwipeMenuView: UIScrollViewDelegate {
 // MARK: - ContentScrollViewDataSource
 
 extension SwipeMenuView: ContentScrollViewDataSource {
-
+    
     public func numberOfPages(in contentScrollView: ContentScrollView) -> Int {
         return dataSource?.numberOfPages(in: self) ?? 0
     }
-
+    
     public func contentScrollView(_ contentScrollView: ContentScrollView, viewForPageAt index: Int) -> UIView? {
         return dataSource?.swipeMenuView(self, viewControllerForPageAt: index).view
     }
diff --git a/Sources/Classes/SwipeMenuViewController.swift b/Sources/Classes/SwipeMenuViewController.swift
index d58101c..5194876 100644
--- a/Sources/Classes/SwipeMenuViewController.swift
+++ b/Sources/Classes/SwipeMenuViewController.swift
@@ -1,31 +1,31 @@
 import UIKit
 
 open class SwipeMenuViewController: UIViewController, SwipeMenuViewDelegate, SwipeMenuViewDataSource {
-
+    
     open var swipeMenuView: SwipeMenuView!
-
+    
     open override func viewDidLoad() {
         super.viewDidLoad()
-
+        
         swipeMenuView = SwipeMenuView(frame: view.frame)
         swipeMenuView.delegate = self
         swipeMenuView.dataSource = self
         view.addSubview(swipeMenuView)
     }
-
+    
     open override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
         super.viewWillTransition(to: size, with: coordinator)
-
+        
         swipeMenuView.willChangeOrientation()
     }
-
+    
     open override func viewDidLayoutSubviews() {
         super.viewDidLayoutSubviews()
         addSwipeMenuViewConstraints()
     }
-
+    
     private func addSwipeMenuViewConstraints() {
-
+        
         swipeMenuView.translatesAutoresizingMaskIntoConstraints = false
         if #available(iOS 11.0, *), view.hasSafeAreaInsets, swipeMenuView.options.tabView.isSafeAreaEnabled {
             NSLayoutConstraint.activate([
@@ -33,33 +33,33 @@ open class SwipeMenuViewController: UIViewController, SwipeMenuViewDelegate, Swi
                 swipeMenuView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
                 swipeMenuView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
                 swipeMenuView.bottomAnchor.constraint(equalTo: view.bottomAnchor)
-            ])
+                ])
         } else {
             NSLayoutConstraint.activate([
                 swipeMenuView.topAnchor.constraint(equalTo: topLayoutGuide.topAnchor),
                 swipeMenuView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
                 swipeMenuView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
                 swipeMenuView.bottomAnchor.constraint(equalTo: view.bottomAnchor)
-            ])
+                ])
         }
     }
-
+    
     // MARK: - SwipeMenuViewDelegate
     open func swipeMenuView(_ swipeMenuView: SwipeMenuView, viewWillSetupAt currentIndex: Int) { }
     open func swipeMenuView(_ swipeMenuView: SwipeMenuView, viewDidSetupAt currentIndex: Int) { }
     open func swipeMenuView(_ swipeMenuView: SwipeMenuView, willChangeIndexFrom fromIndex: Int, to toIndex: Int) { }
     open func swipeMenuView(_ swipeMenuView: SwipeMenuView, didChangeIndexFrom fromIndex: Int, to toIndex: Int) { }
-
+    
     // MARK: - SwipeMenuViewDataSource
-
+    
     open func numberOfPages(in swipeMenuView: SwipeMenuView) -> Int {
         return children.count
     }
-
+    
     open func swipeMenuView(_ swipeMenuView: SwipeMenuView, titleForPageAt index: Int) -> String {
         return children[index].title ?? ""
     }
-
+    
     open func swipeMenuView(_ swipeMenuView: SwipeMenuView, viewControllerForPageAt index: Int) -> UIViewController {
         let vc = children[index]
         vc.didMove(toParent: self)
diff --git a/Sources/Classes/TabItemView.swift b/Sources/Classes/TabItemView.swift
index 4b7d1ff..752e2c9 100644
--- a/Sources/Classes/TabItemView.swift
+++ b/Sources/Classes/TabItemView.swift
@@ -1,12 +1,12 @@
 import UIKit
 
 final class TabItemView: UIView {
-
+    
     private(set) var titleLabel: UILabel = UILabel()
-
+    
     public var textColor: UIColor = UIColor(red: 140/255, green: 140/255, blue: 140/255, alpha: 1.0)
     public var selectedTextColor: UIColor = .white
-
+    
     public var isSelected: Bool = false {
         didSet {
             if isSelected {
@@ -16,21 +16,21 @@ final class TabItemView: UIView {
             }
         }
     }
-
+    
     public override init(frame: CGRect) {
         super.init(frame: frame)
-
+        
         setupLabel()
     }
-
+    
     required public init?(coder aDecoder: NSCoder) {
         super.init(coder: aDecoder)
     }
-
+    
     override public func layoutSubviews() {
         super.layoutSubviews()
     }
-
+    
     private func setupLabel() {
         titleLabel = UILabel(frame: bounds)
         titleLabel.textAlignment = .center
@@ -40,15 +40,15 @@ final class TabItemView: UIView {
         addSubview(titleLabel)
         layoutLabel()
     }
-
+    
     private func layoutLabel() {
-
+        
         titleLabel.translatesAutoresizingMaskIntoConstraints = false
         NSLayoutConstraint.activate([
             titleLabel.topAnchor.constraint(equalTo: self.topAnchor),
             titleLabel.widthAnchor.constraint(equalTo: self.widthAnchor),
             titleLabel.centerXAnchor.constraint(equalTo: self.centerXAnchor),
             titleLabel.bottomAnchor.constraint(equalTo: self.bottomAnchor)
-        ])
+            ])
     }
 }
diff --git a/Sources/Classes/TabView.swift b/Sources/Classes/TabView.swift
index 97a4e72..32a4640 100644
--- a/Sources/Classes/TabView.swift
+++ b/Sources/Classes/TabView.swift
@@ -3,89 +3,91 @@ import UIKit
 // MARK: - TabViewDelegate
 
 public protocol TabViewDelegate: class {
-
+    
     /// Called before selecting the tab.
     func tabView(_ tabView: TabView, willSelectTabAt index: Int)
-
+    
     /// Called after selecting the tab.
     func tabView(_ tabView: TabView, didSelectTabAt index: Int)
 }
 
 extension TabViewDelegate {
     public func tabView(_ tabView: TabView, willSelectTabAt index: Int) {}
-
+    
     public func tabView(_ tabView: TabView, didSelectTabAt index: Int) {}
 }
 
 // MARK: - TabViewDataSource
 
 public protocol TabViewDataSource: class {
-
+    
     /// Return the number of Items in `TabView`.
     func numberOfItems(in tabView: TabView) -> Int
-
+    
     /// Return strings to be displayed at the tab in `TabView`.
     func tabView(_ tabView: TabView, titleForItemAt index: Int) -> String?
 }
 
-open class TabView: UIScrollView {
 
+// MARK: - TabView class
+open class TabView: UIScrollView {
+    
     open weak var tabViewDelegate: TabViewDelegate?
     open weak var dataSource: TabViewDataSource?
-
+    
     var itemViews: [TabItemView] = []
-
+    
     fileprivate let containerView: UIStackView = UIStackView()
-
+    
     fileprivate var additionView: UIView = .init()
-
+    
     fileprivate var currentIndex: Int = 0
-
+    
     fileprivate(set) var options: SwipeMenuViewOptions.TabView = SwipeMenuViewOptions.TabView()
-
+    
     private var leftMarginConstraint: NSLayoutConstraint = .init()
     private var widthConstraint: NSLayoutConstraint = .init()
-
+    
     public init(frame: CGRect, options: SwipeMenuViewOptions.TabView? = nil) {
         super.init(frame: frame)
-
+        
         if let options = options {
             self.options = options
         }
     }
-
+    
     public required init?(coder aDecoder: NSCoder) {
         fatalError("init(coder:) has not been implemented")
     }
-
+    
     open override func didMoveToSuperview() {
         reloadData()
     }
-
+    
     open override func layoutSubviews() {
         super.layoutSubviews()
         resetAdditionViewPosition(index: currentIndex)
     }
-
+    
     @available(iOS 11.0, *)
     open override func safeAreaInsetsDidChange() {
         super.safeAreaInsetsDidChange()
-
+        
         leftMarginConstraint.constant = options.margin + safeAreaInsets.left
         if options.style == .segmented {
             widthConstraint.constant = options.margin * -2 - safeAreaInsets.left - safeAreaInsets.right
         }
-
+        
         layoutIfNeeded()
     }
-
+    
     fileprivate func focus(on target: UIView, animated: Bool = true) {
-
+        
         if options.style == .segmented { return }
-
+        
         let offset: CGFloat
         let contentWidth: CGFloat
-
+        
         if #available(iOS 11.0, *), options.isSafeAreaEnabled {
             offset = target.center.x + options.margin + safeAreaInsets.left - self.frame.width / 2
             contentWidth = containerView.frame.width + options.margin * 2 + safeAreaInsets.left + safeAreaInsets.right
@@ -93,7 +95,7 @@ open class TabView: UIScrollView {
             offset = target.center.x + options.margin - self.frame.width / 2
             contentWidth = containerView.frame.width + options.margin * 2
         }
-
+        
         if offset < 0 || self.frame.width > contentWidth {
             self.setContentOffset(CGPoint(x: 0, y: 0), animated: animated)
         } else if contentWidth - self.frame.width < offset {
@@ -102,33 +104,33 @@ open class TabView: UIScrollView {
             self.setContentOffset(CGPoint(x: offset, y: 0), animated: animated)
         }
     }
-
+    
     // MARK: - Setup
-
+    
     /// Reloads all `TabView` item views with the dataSource and refreshes the display.
     public func reloadData(options: SwipeMenuViewOptions.TabView? = nil,
                            default defaultIndex: Int? = nil,
                            animated: Bool = true) {
-
+        
         if let options = options {
             self.options = options
         }
-
+        
         reset()
-
+        
         guard let dataSource = dataSource,
             dataSource.numberOfItems(in: self) > 0 else { return }
-
+        
         setupScrollView()
         setupContainerView(dataSource: dataSource)
         setupTabItemViews(dataSource: dataSource)
         setupAdditionView()
-
+        
         if let defaultIndex = defaultIndex {
             moveTabItem(index: defaultIndex, animated: animated)
         }
     }
-
+    
     func reset() {
         currentIndex = 0
         itemViews.forEach { $0.removeFromSuperview() }
@@ -136,15 +138,27 @@ open class TabView: UIScrollView {
         containerView.removeFromSuperview()
         itemViews = []
     }
-
+    
     func update(_ index: Int) {
-
+        
         if currentIndex == index { return }
-
+        
         currentIndex = index
         updateSelectedItem(by: currentIndex)
     }
-
+    
+    func updateSemantic() {
+        if #available(iOS 9.0, *) {
+            if options.isLanguageRTL {
+                self.semanticContentAttribute = .forceRightToLeft
+                self.containerView.semanticContentAttribute  = .forceRightToLeft
+            } else {
+                self.semanticContentAttribute = .forceLeftToRight
+                self.containerView.semanticContentAttribute  = .forceLeftToRight
+            }
+        }
+    }
+    
     fileprivate func setupScrollView() {
         backgroundColor = options.backgroundColor
         showsHorizontalScrollIndicator = false
@@ -156,28 +170,28 @@ open class TabView: UIScrollView {
         bouncesZoom = false
         translatesAutoresizingMaskIntoConstraints = false
     }
-
+    
     fileprivate func setupContainerView(dataSource: TabViewDataSource) {
-
+        
         containerView.alignment = .leading
-
+        
         switch options.style {
         case .flexible:
             containerView.distribution = .fill
         case .segmented:
             containerView.distribution = .fillEqually
         }
-
+        
         let itemCount = dataSource.numberOfItems(in: self)
         var containerHeight: CGFloat = 0.0
-
+        
         switch options.addition {
         case .underline:
             containerHeight = frame.height - options.additionView.underline.height - options.additionView.padding.bottom
         case .none, .circle:
             containerHeight = frame.height
         }
-
+        
         switch options.style {
         case .flexible:
             let containerWidth = options.itemView.width * CGFloat(itemCount)
@@ -197,19 +211,19 @@ open class TabView: UIScrollView {
                 containerView .frame = CGRect(x: 0, y: options.margin, width: frame.width - options.margin * 2, height: containerHeight)
             }
         }
-
+        
         containerView.backgroundColor = .clear
         addSubview(containerView)
     }
-
+    
     fileprivate func setupTabItemViews(dataSource: TabViewDataSource) {
-
+        
         itemViews = []
-
+        
         let itemCount = dataSource.numberOfItems(in: self)
-
+        
         var xPosition: CGFloat = 0
-
+        
         for index in 0..<itemCount {
             let tabItemView = TabItemView(frame: CGRect(x: xPosition, y: 0, width: options.itemView.width, height: containerView.frame.size.height))
             tabItemView.translatesAutoresizingMaskIntoConstraints = false
@@ -220,24 +234,24 @@ open class TabView: UIScrollView {
                 tabItemView.textColor = options.itemView.textColor
                 tabItemView.selectedTextColor = options.itemView.selectedTextColor
             }
-
+            
             tabItemView.isSelected = index == currentIndex
-
+            
             switch options.style {
             case .flexible:
                 if options.needsAdjustItemViewWidth {
                     var adjustCellSize = tabItemView.frame.size
                     adjustCellSize.width = tabItemView.titleLabel.sizeThatFits(containerView.frame.size).width + options.itemView.margin * 2
                     tabItemView.frame.size = adjustCellSize
-
+                    
                     containerView.addArrangedSubview(tabItemView)
-
+                    
                     NSLayoutConstraint.activate([
                         tabItemView.widthAnchor.constraint(equalToConstant: adjustCellSize.width)
                         ])
                 } else {
                     containerView.addArrangedSubview(tabItemView)
-
+                    
                     NSLayoutConstraint.activate([
                         tabItemView.widthAnchor.constraint(equalToConstant: options.itemView.width)
                         ])
@@ -250,27 +264,27 @@ open class TabView: UIScrollView {
                     adjustCellSize = CGSize(width: (frame.width - options.margin * 2) / CGFloat(itemCount), height: tabItemView.frame.size.height)
                 }
                 tabItemView.frame.size = adjustCellSize
-
+                
                 containerView.addArrangedSubview(tabItemView)
             }
-
+            
             itemViews.append(tabItemView)
-
+            
             NSLayoutConstraint.activate([
                 tabItemView.topAnchor.constraint(equalTo: containerView.topAnchor),
                 tabItemView.bottomAnchor.constraint(equalTo: containerView.bottomAnchor)
                 ])
-
+            
             xPosition += tabItemView.frame.size.width
         }
-
+        
         layout(containerView: containerView, containerWidth: xPosition)
         addTabItemGestures()
         animateAdditionView(index: currentIndex, animated: false)
     }
-
+    
     private func layout(containerView: UIView, containerWidth: CGFloat) {
-
+        
         containerView.frame.size.width = containerWidth
         containerView.translatesAutoresizingMaskIntoConstraints = false
         
@@ -281,17 +295,18 @@ open class TabView: UIScrollView {
         case .circle, .none:
             heightConstraint = containerView.heightAnchor.constraint(equalToConstant: options.height)
         }
-
+        
         switch options.style {
         case .flexible:
             if #available(iOS 11.0, *), options.isSafeAreaEnabled {
                 leftMarginConstraint = containerView.leadingAnchor.constraint(equalTo: self.leadingAnchor, constant: options.margin + safeAreaInsets.left)
-
+                
                 NSLayoutConstraint.activate([
                     containerView.topAnchor.constraint(equalTo: self.topAnchor),
                     leftMarginConstraint,
                     containerView.widthAnchor.constraint(equalToConstant: containerWidth),
-                    heightConstraint
+                    heightConstraint,
+                    containerView.trailingAnchor.constraint(equalTo: self.trailingAnchor)
                     ])
                 contentSize.width = containerWidth + options.margin * 2 + safeAreaInsets.left - safeAreaInsets.right
             } else {
@@ -300,7 +315,8 @@ open class TabView: UIScrollView {
                     containerView.topAnchor.constraint(equalTo: self.topAnchor),
                     leftMarginConstraint,
                     containerView.widthAnchor.constraint(equalToConstant: containerWidth),
-                    heightConstraint
+                    heightConstraint,
+                    containerView.trailingAnchor.constraint(equalTo: self.trailingAnchor)
                     ])
                 contentSize.width = containerWidth + options.margin * 2
             }
@@ -312,7 +328,8 @@ open class TabView: UIScrollView {
                     containerView.topAnchor.constraint(equalTo: self.topAnchor),
                     leftMarginConstraint,
                     widthConstraint,
-                    heightConstraint
+                    heightConstraint,
+                    containerView.trailingAnchor.constraint(equalTo: self.trailingAnchor)
                     ])
             } else {
                 leftMarginConstraint = containerView.leadingAnchor.constraint(equalTo: self.leadingAnchor, constant: options.margin)
@@ -321,14 +338,15 @@ open class TabView: UIScrollView {
                     containerView.topAnchor.constraint(equalTo: self.topAnchor),
                     leftMarginConstraint,
                     widthConstraint,
-                    heightConstraint
+                    heightConstraint,
+                    containerView.trailingAnchor.constraint(equalTo: self.trailingAnchor)
                     ])
             }
-
+            
             contentSize = .zero
         }
     }
-
+    
     private func updateSelectedItem(by newIndex: Int) {
         for (i, itemView) in itemViews.enumerated() {
             itemView.isSelected = i == newIndex
@@ -339,15 +357,15 @@ open class TabView: UIScrollView {
 // MARK: - AdditionView
 
 extension TabView {
-
+    
     public enum Direction {
         case forward
         case reverse
     }
-
+    
     fileprivate func setupAdditionView() {
         if itemViews.isEmpty { return }
-
+        
         switch options.addition {
         case .underline:
             let itemView = itemViews[currentIndex]
@@ -366,23 +384,23 @@ extension TabView {
         case .none:
             additionView.backgroundColor = .clear
         }
-
+        
         jump(to: currentIndex)
     }
-
-    private func updateAdditionViewPosition(index: Int) {
+    
+    func updateAdditionViewPosition(index: Int) {
         guard let target = currentItem else { return }
-
+        
         additionView.frame.origin.x = target.frame.origin.x + options.additionView.padding.left
-
+        
         if options.needsAdjustItemViewWidth {
             let cellWidth = itemViews[index].frame.width
             additionView.frame.size.width = cellWidth - options.additionView.padding.horizontal
         }
-
+        
         focus(on: target)
     }
-
+    
     fileprivate func resetAdditionViewPosition(index: Int) {
         guard options.style == .segmented,
             let dataSource = dataSource,
@@ -393,15 +411,15 @@ extension TabView {
         } else {
             adjustCellWidth = (frame.width - options.margin * 2) / CGFloat(dataSource.numberOfItems(in: self)) - options.additionView.padding.horizontal
         }
-
+        
         additionView.frame.origin.x = adjustCellWidth * CGFloat(index) - options.additionView.padding.left
         additionView.frame.size.width = adjustCellWidth
     }
-
+    
     fileprivate func animateAdditionView(index: Int, animated: Bool, completion: ((Bool) -> Swift.Void)? = nil) {
-
+        
         update(index)
-
+        
         if animated {
             UIView.animate(withDuration: options.additionView.animationDuration, animations: {
                 self.updateAdditionViewPosition(index: index)
@@ -410,34 +428,37 @@ extension TabView {
             updateAdditionViewPosition(index: index)
         }
     }
-
+    
     func moveAdditionView(index: Int, ratio: CGFloat, direction: Direction) {
-
+        
         update(index)
-
+        
         guard let currentItem = currentItem else { return }
-
+        
+        let newRatio = options.isLanguageRTL ? (1-ratio) : ratio
         switch direction {
         case .forward:
-            additionView.frame.origin.x = currentItem.frame.origin.x + (nextItem.frame.origin.x - currentItem.frame.origin.x) * ratio + options.additionView.padding.left
-            additionView.frame.size.width = currentItem.frame.size.width + (nextItem.frame.size.width - currentItem.frame.size.width) * ratio - options.additionView.padding.horizontal
+            
+            additionView.frame.origin.x = currentItem.frame.origin.x + (nextItem.frame.origin.x - currentItem.frame.origin.x) * newRatio + options.additionView.padding.left
+            additionView.frame.size.width = currentItem.frame.size.width + (nextItem.frame.size.width - currentItem.frame.size.width) * newRatio - options.additionView.padding.horizontal
+            
             if options.needsConvertTextColorRatio {
-                nextItem.titleLabel.textColor = options.itemView.textColor.convert(to: options.itemView.selectedTextColor, multiplier: ratio)
-                currentItem.titleLabel.textColor = options.itemView.selectedTextColor.convert(to: options.itemView.textColor, multiplier: ratio)
+                nextItem.titleLabel.textColor = options.itemView.textColor.convert(to: options.itemView.selectedTextColor, multiplier: newRatio)
+                currentItem.titleLabel.textColor = options.itemView.selectedTextColor.convert(to: options.itemView.textColor, multiplier: newRatio)
             }
         case .reverse:
-            additionView.frame.origin.x = previousItem.frame.origin.x + (currentItem.frame.origin.x - previousItem.frame.origin.x) * ratio + options.additionView.padding.left
-            additionView.frame.size.width = previousItem.frame.size.width + (currentItem.frame.size.width - previousItem.frame.size.width) * ratio - options.additionView.padding.horizontal
+            additionView.frame.origin.x = previousItem.frame.origin.x + (currentItem.frame.origin.x - previousItem.frame.origin.x) * newRatio + options.additionView.padding.left
+            additionView.frame.size.width = previousItem.frame.size.width + (currentItem.frame.size.width - previousItem.frame.size.width) * newRatio - options.additionView.padding.horizontal
             if options.needsConvertTextColorRatio {
-                previousItem.titleLabel.textColor = options.itemView.selectedTextColor.convert(to: options.itemView.textColor, multiplier: ratio)
-                currentItem.titleLabel.textColor = options.itemView.textColor.convert(to: options.itemView.selectedTextColor, multiplier: ratio)
+                previousItem.titleLabel.textColor = options.itemView.selectedTextColor.convert(to: options.itemView.textColor, multiplier: newRatio)
+                currentItem.titleLabel.textColor = options.itemView.textColor.convert(to: options.itemView.selectedTextColor, multiplier: newRatio)
             }
         }
-
-        if options.itemView.selectedTextColor.convert(to: options.itemView.textColor, multiplier: ratio) == nil {
+        
+        if options.itemView.selectedTextColor.convert(to: options.itemView.textColor, multiplier: newRatio) == nil {
             updateSelectedItem(by: currentIndex)
         }
-
+        
         focus(on: additionView, animated: false)
     }
 }
@@ -446,31 +467,31 @@ extension TabView {
     var currentItem: TabItemView? {
         return currentIndex < itemViews.count ? itemViews[currentIndex] : nil
     }
-
+    
     var nextItem: TabItemView {
         if currentIndex < itemViews.count - 1 {
             return itemViews[currentIndex + 1]
         }
         return itemViews[currentIndex]
     }
-
+    
     var previousItem: TabItemView {
         if currentIndex > 0 {
             return itemViews[currentIndex - 1]
         }
         return itemViews[currentIndex]
     }
-
+    
     func jump(to index: Int) {
         update(index)
-
+        
         guard let currentItem = currentItem else { return }
-
+        
         if options.addition == .underline {
             additionView.frame.origin.x = currentItem.frame.origin.x + options.additionView.padding.left
             additionView.frame.size.width = currentItem.frame.size.width - options.additionView.padding.horizontal
         }
-
+        
         focus(on: currentItem, animated: false)
     }
 }
@@ -478,20 +499,20 @@ extension TabView {
 // MARK: - GestureRecognizer
 
 extension TabView {
-
+    
     fileprivate var tapGestureRecognizer: UITapGestureRecognizer {
         let gestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(tapItemView(_:)))
         gestureRecognizer.numberOfTapsRequired = 1
         gestureRecognizer.cancelsTouchesInView = false
         return gestureRecognizer
     }
-
+    
     fileprivate func addTabItemGestures() {
         itemViews.forEach {
             $0.addGestureRecognizer(tapGestureRecognizer)
         }
     }
-
+    
     @objc func tapItemView(_ recognizer: UITapGestureRecognizer) {
         guard let itemView = recognizer.view as? TabItemView,
             let index: Int = itemViews.index(of: itemView),
@@ -501,9 +522,9 @@ extension TabView {
         update(index)
         tabViewDelegate?.tabView(self, didSelectTabAt: index)
     }
-
+    
     private func moveTabItem(index: Int, animated: Bool) {
-
+        
         switch options.addition {
         case .underline, .circle:
             animateAdditionView(index: index, animated: animated, completion: nil)
diff --git a/SwipeMenuViewController.xcodeproj/project.pbxproj b/SwipeMenuViewController.xcodeproj/project.pbxproj
index e8de770..72dd80f 100644
--- a/SwipeMenuViewController.xcodeproj/project.pbxproj
+++ b/SwipeMenuViewController.xcodeproj/project.pbxproj
@@ -503,13 +503,14 @@
 			buildSettings = {
 				ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES = YES;
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				CODE_SIGN_IDENTITY = "iPhone Developer";
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
 				CODE_SIGN_STYLE = Manual;
 				DEVELOPMENT_TEAM = "";
 				INFOPLIST_FILE = Example/Info.plist;
 				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
-				PRODUCT_BUNDLE_IDENTIFIER = cc.yysskk.Example;
+				PRODUCT_BUNDLE_IDENTIFIER = cc.yysskk.Example.AR.test;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				PROVISIONING_PROFILE_SPECIFIER = "";
 				SWIFT_VERSION = 4.2;
@@ -521,13 +522,14 @@
 			buildSettings = {
 				ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES = YES;
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				CODE_SIGN_IDENTITY = "iPhone Developer";
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
 				CODE_SIGN_STYLE = Manual;
 				DEVELOPMENT_TEAM = "";
 				INFOPLIST_FILE = Example/Info.plist;
 				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
-				PRODUCT_BUNDLE_IDENTIFIER = cc.yysskk.Example;
+				PRODUCT_BUNDLE_IDENTIFIER = cc.yysskk.Example.AR.test;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				PROVISIONING_PROFILE_SPECIFIER = "";
 				SWIFT_VERSION = 4.2;