介紹

在 iOS 26 中，UIScrollView 迎來了兩個重要增強(qiáng)，主要聚焦于滾動邊緣的視覺效果和與浮動容器的交互體驗(yàn)。這些改進(jìn)不僅讓滾動過渡更自然，還提升了在復(fù)雜界面中內(nèi)容的可讀性。

UIScrollEdgeEffect

過去，當(dāng)內(nèi)容滾動到邊緣時，系統(tǒng)會使用回彈（bounce）或發(fā)光（glow）效果來提示用戶。但在 iOS 26 中，Apple 增加了類型為UIScrollEdgeEffect的屬性topEdgeEffect、leftEdgeEffect、bottomEdgeEffect與rightEdgeEffect，用于設(shè)置滾動邊緣的效果。

UIScrollEdgeElementContainerInteraction

除了邊緣效果，Apple 還引入新的交互UIScrollEdgeElementContainerInteraction，可以將導(dǎo)航欄、標(biāo)簽欄、工具欄或者自定義浮動視圖標(biāo)記為邊緣元素容器，當(dāng)內(nèi)容滾動到該容器下方時，系統(tǒng)會自動添加一個漸變模糊效果，從而保證疊加內(nèi)容的可讀性。

案例

代碼

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
        // 關(guān)聯(lián)視圖
        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)
        ])
    }
}

效果

效果.gif