StickyViewController

StickyViewController is a customizable base UIViewController subclass that allows up to three sticky views to stay pinned to the top of the screen as their corresponding content views scroll out of view.

This is useful for building scrollable headers, sections, or banners that stay visible while users scroll through content.

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📹 Sample Video

Simulator.Screen.Recording.-.iPhone.16.Pro.-.2025-07-31.at.16.30.57.mp4

📦 Installation (Swift Package Manager)

1. Open your Xcode project.
2. Go to File > Add Packages.
3. Paste the URL of this repository:

https://github.com/KimNahun/StickyViewController.git

4. Choose the branch, tag, or revision you want to install.

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🚀 Features

• Up to 3 independently controlled sticky views
• Simple setup via one method: configureStickyViews(...)
• Clean and readable Swift code using UIKit

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📄 Usage

1. Subclass StickyViewController in your UIViewController
2. Override viewDidLoad()
3. Call configureStickyViews(...) to register content views and corresponding sticky views

import UIKit
import SnapKit
import Then
import StickyViewController

class PracticeViewController: StickyViewController {

    private let redView = UIView().then { $0.backgroundColor = .red }
    private let greenView = UIView().then { $0.backgroundColor = .green }
    private let blueView = UIView().then { $0.backgroundColor = .blue }

    private let redStickyView = UIView().then { $0.backgroundColor = .red }
    private let greenStickyView = UIView().then { $0.backgroundColor = .green }
    private let blueStickyView = UIView().then { $0.backgroundColor = .blue }

    override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = .white
        layoutScrollContent()

        configureStickyViews(
            scrollView: scrollView,
            stickyItems: [
                (redView, redStickyView, 60),
                (greenView, greenStickyView, 100),
                (blueView, blueStickyView, 80)
            ]
        )
    }

    private func layoutScrollContent() {
        [redView, greenView, blueView].forEach {
            scrollView.addSubview($0)
            $0.snp.makeConstraints { $0.height.equalTo(500) }
        }

        redView.snp.makeConstraints {
            $0.top.equalToSuperview().offset(300)
            $0.leading.trailing.equalToSuperview()
            $0.width.equalToSuperview()
        }

        greenView.snp.makeConstraints {
            $0.top.equalTo(redView.snp.bottom).offset(300)
            $0.leading.trailing.equalToSuperview()
            $0.width.equalToSuperview()
        }

        blueView.snp.makeConstraints {
            $0.top.equalTo(greenView.snp.bottom).offset(300)
            $0.leading.trailing.equalToSuperview()
            $0.width.equalToSuperview()
            $0.bottom.equalToSuperview().offset(-1000)
        }
    }
}

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🧠 How it works

• Each sticky item is defined by a content view inside the scroll view, a corresponding sticky view to pin, and a height.
• As the user scrolls, if a content view scrolls offscreen, its sticky view is shown and pinned.
• Sticky views stack vertically at the top in the order you registered them.

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✏️ Customize Sticky Views

Each sticky view is just a UIView, so you can:

• Add labels, buttons, images, etc.
• Animate them as needed
• Match their frame, style, or color to your design

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