SwiftUI - 如何获取 ScrollView 内容的大小(高度) [英] SwiftUI - How to get size (height) of ScrollView content

问题描述

我想确定我的(垂直)ScrollView 中内容的高度.

I want to determine the height of the content inside my (vertical) ScrollView.

ScrollView {  
    //My Content
}

这可能吗?我尝试了一些东西，但似乎没有任何效果.

Is this possible? I've tried a few things but nothing seems to work.

不幸的是，简单地使用 GeometryReader 不起作用，因为无论 ScrollView 中有什么内容，它都会返回 10 的值

Unfortunately, using simply the GeometryReader isn't working, since it returns a value of 10 no matter what content is inside the ScrollView

谢谢！

推荐答案

这里提供了一种实际获取 ScrollView 内容的 height 的方法.

Here is a way to actually get the height of the ScrollView content.

CZ54s 的回答看起来很直观，但它总是返回 10 的高度，这是不正确的！

CZ54s answer seems intuitive, but it always returns a height of 10 which is not correct!.

我们必须改为读取内容的高度.GeometryReader 直接在 ScrollView 内部不会这样做.一种可能的方法是使用 .background/.overlay.

We have to read the height of the content instead. GeometryReader directly inside ScrollView doesn't do that. A possible approach would be with .background/.overlay.

struct ContentView: View {

    var body: some View {
        ScrollView {
            ForEach(0..<1000) { i in
                Text("\(i)")
            }
            .background(
                GeometryReader { proxy in
                    Color.clear.onAppear { print(proxy.size.height) }
                }
            )
        }
    }
}

我们得到了 20500.0 的输出，这是正确的.

We get an output of 20500.0 which is correct.

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