iOS26适配指南之UIScrollView

介绍

在 iOS 26 中，UIScrollView 迎来了两个重要增强，主要聚焦于滚动边缘的视觉效果和与浮动容器的交互体验。这些改进不仅让滚动过渡更自然，还提升了在复杂界面中内容的可读性。

UIScrollEdgeEffect

过去，当内容滚动到边缘时，系统会使用回弹（bounce）或发光（glow）效果来提示用户。但在 iOS 26 中，Apple 增加了类型为UIScrollEdgeEffect的属性topEdgeEffect、leftEdgeEffect、bottomEdgeEffect与rightEdgeEffect，用于设置滚动边缘的效果。

UIScrollEdgeElementContainerInteraction

除了边缘效果，Apple 还引入新的交互UIScrollEdgeElementContainerInteraction，可以将导航栏、标签栏、工具栏或者自定义浮动视图标记为边缘元素容器，当内容滚动到该容器下方时，系统会自动添加一个渐变模糊效果，从而保证叠加内容的可读性。

案例

代码

swift 复制代码

import UIKit

class ViewController: UIViewController {
    lazy var scrollView: UIScrollView = {
        let scrollView = UIScrollView()
        scrollView.translatesAutoresizingMaskIntoConstraints = false
        scrollView.addSubview(contentView)
        scrollView.contentSize = contentView.frame.size
        // iOS26新增
        // scrollView.bottomEdgeEffect.style = .hard
        return scrollView
    }()

    lazy var contentView: UIView = {
        let view = UIView()
        view.backgroundColor = .black
        view.translatesAutoresizingMaskIntoConstraints = false
        return view
    }()

    lazy var stackView: UIStackView = {
        var config = UIButton.Configuration.clearGlass()
        config.title = "Action"
        let button1 = UIButton(type: .system)
        button1.configuration = config
        let button2 = UIButton(type: .system)
        config.title = "More"
        button2.configuration = config
        let stackView = UIStackView(arrangedSubviews: [button1, button2])
        stackView.axis = .horizontal
        stackView.spacing = 16
        stackView.translatesAutoresizingMaskIntoConstraints = false
        // iOS26新增
        let interaction = UIScrollEdgeElementContainerInteraction()
        interaction.scrollView = scrollView
        interaction.edge = .bottom
        // 关联视图
        stackView.addInteraction(interaction)
        return stackView
    }()

    override func viewDidLoad() {
        super.viewDidLoad()

        view.addSubview(scrollView)
        view.addSubview(stackView)

        NSLayoutConstraint.activate([
            scrollView.topAnchor.constraint(equalTo: view.topAnchor),
            scrollView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
            scrollView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
            scrollView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
            contentView.topAnchor.constraint(equalTo: scrollView.contentLayoutGuide.topAnchor),
            contentView.leadingAnchor.constraint(equalTo: scrollView.contentLayoutGuide.leadingAnchor),
            contentView.bottomAnchor.constraint(equalTo: scrollView.contentLayoutGuide.bottomAnchor),
            contentView.trailingAnchor.constraint(equalTo: scrollView.contentLayoutGuide.trailingAnchor),
            contentView.widthAnchor.constraint(equalTo: scrollView.frameLayoutGuide.widthAnchor),
            contentView.heightAnchor.constraint(equalToConstant: 1000),
            stackView.centerXAnchor.constraint(equalTo: view.centerXAnchor),
            stackView.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor, constant: -20)
        ])
    }
}