如何在 SwiftUI 或无限列表视图中实现列表分页? [英] How do you implement list paging in SwiftUI or infinite list view?

问题描述

我需要有关如何在 SwiftUI 中实现无限列表滚动或分页列表的帮助.提前致谢

I want help on how to implement infinite list scrolling or paging list in SwiftUI.Thanks in advance

推荐答案

最好的办法是使用 .onAppear 并计算是否是时候获取下一页.这是一个人为的例子，因为通常您正在访问比这慢得多的网络或磁盘，但它会给您一个想法.针对您的特定用例调整 getNextPageIfNecessary(_:).

Your best bet is to use .onAppear and calculate if it's time to fetch your next page. This is a contrived example because typically you're hitting a network or disk which is much slower than this, but it will give you an idea. Tune getNextPageIfNecessary(_:) for your particular use-case.

@State var rows: [String] = Array(repeating: "Item", count: 20)

var body: some View {

    List(0..<rows.count, id: \.self) { index in
        Text(verbatim: self.rows[index])
            .onAppear {
                self.getNextPageIfNecessary(encounteredIndex: index)
            }
    }
}

private func getNextPageIfNecessary(encounteredIndex: Int) {
    guard encounteredIndex == rows.count - 1 else { return }

    rows.append(contentsOf: Array(repeating: "Item", count: 20))
}

这篇关于如何在 SwiftUI 或无限列表视图中实现列表分页?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！