diff --git a/Sources/Classes/SwipeMenuView.swift b/Sources/Classes/SwipeMenuView.swift
index bfa4b19..b5d782c 100644
--- a/Sources/Classes/SwipeMenuView.swift
+++ b/Sources/Classes/SwipeMenuView.swift
@@ -61,6 +61,9 @@ public struct SwipeMenuViewOptions {
             /// AdditionView paddings. Defaults to `.zero`.
             public var padding: UIEdgeInsets = .zero
             
+            /// AdditionView ratio is AdditionView / TabView. Defaults to `0.5`.
+            public var widthRatio: Double = 0.5
+            
             /// AdditionView backgroundColor. Defaults to `.black`.
             public var backgroundColor: UIColor = .black
             
@@ -100,6 +103,9 @@ public struct SwipeMenuViewOptions {
 
         /// Convert the text color of ItemView to selected text color by scroll rate of ContentScrollView. Defaults to `true`.
         public var needsConvertTextColorRatio: Bool = true
+        
+        /// TabView adjust width ratio or not. Defaults to `true`.
+        public var needsAdjustItemViewRaitoWidth: Bool = true
 
         /// TabView enable safeAreaLayout. Defaults to `true`.
         public var isSafeAreaEnabled: Bool = true
@@ -147,7 +153,7 @@ public struct SwipeMenuViewOptions {
 
 // MARK: - SwipeMenuViewDelegate
 
-public protocol SwipeMenuViewDelegate: class {
+public protocol SwipeMenuViewDelegate: AnyObject {
 
     /// Called before setup self.
     func swipeMenuView(_ swipeMenuView: SwipeMenuView, viewWillSetupAt currentIndex: Int)
@@ -171,7 +177,7 @@ extension SwipeMenuViewDelegate {
 
 // MARK: - SwipeMenuViewDataSource
 
-public protocol SwipeMenuViewDataSource: class {
+public protocol SwipeMenuViewDataSource: AnyObject {
 
     /// Return the number of pages in `SwipeMenuView`.
     func numberOfPages(in swipeMenuView: SwipeMenuView) -> Int
diff --git a/Sources/Classes/TabView.swift b/Sources/Classes/TabView.swift
index 8b20a6e..84a62b2 100644
--- a/Sources/Classes/TabView.swift
+++ b/Sources/Classes/TabView.swift
@@ -2,7 +2,7 @@ import UIKit
 
 // MARK: - TabViewDelegate
 
-public protocol TabViewDelegate: class {
+public protocol TabViewDelegate: AnyObject {
 
     /// Called before selecting the tab.
     func tabView(_ tabView: TabView, willSelectTabAt index: Int)
@@ -19,7 +19,7 @@ extension TabViewDelegate {
 
 // MARK: - TabViewDataSource
 
-public protocol TabViewDataSource: class {
+public protocol TabViewDataSource: AnyObject {
 
     /// Return the number of Items in `TabView`.
     func numberOfItems(in tabView: TabView) -> Int
@@ -351,6 +351,11 @@ extension TabView {
         switch options.addition {
         case .underline:
             let itemView = itemViews[currentIndex]
+            if options.needsAdjustItemViewRaitoWidth {
+                let padding = itemView.frame.width * (1 - options.additionView.widthRatio) / 2
+                options.additionView.padding.left = padding
+                options.additionView.padding.right = padding
+            }
             additionView = UIView(frame: CGRect(x: itemView.frame.origin.x + options.additionView.padding.left, y: itemView.frame.height - options.additionView.padding.vertical, width: itemView.frame.width - options.additionView.padding.horizontal, height: options.additionView.underline.height))
             additionView.backgroundColor = options.additionView.backgroundColor
             containerView.addSubview(additionView)
@@ -402,10 +407,14 @@ extension TabView {
     private 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
+            if options.needsAdjustItemViewRaitoWidth {
+                let padding = cellWidth * (1 - options.additionView.widthRatio) / 2
+                options.additionView.padding.left = padding
+                options.additionView.padding.right = padding
+            }
+            additionView.frame.origin.x = target.frame.origin.x + options.additionView.padding.left
             additionView.frame.size.width = cellWidth - options.additionView.padding.horizontal
         }