在SwiftUI中，控制事件在哪里，即scrollViewDidScroll检测列表数据的底部 [英] In SwiftUI, where are the control events, i.e. scrollViewDidScroll to detect the bottom of list data

问题描述

在 SwiftUI 中，有谁知道控制事件(例如 scrollViewDidScroll)在哪里检测用户何时到达列表底部导致事件检索额外的数据块?或者有没有新的方法来做到这一点?

In SwiftUI, does anyone know where are the control events such as scrollViewDidScroll to detect when a user reaches the bottom of a list causing an event to retrieve additional chunks of data? Or is there a new way to do this?

好像 UIRefreshControl() 也不存在...

Seems like UIRefreshControl() is not there either...

推荐答案

可以检查最新的元素是否出现在 onAppear 里面.

You can to check that the latest element is appeared inside onAppear.

struct ContentView: View {
    @State var items = Array(1...30)

    var body: some View {
        List {
            ForEach(items, id: \.self) { item in
                Text("\(item)")
                .onAppear {
                    if let last == self.items.last {
                        print("last item")
                        self.items += last+1...last+30
                    }
                }
            }
        }
    }
}

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