在swiftUI中的scrollView中填充高度 [英] Fill height in scrollView in swiftUI

问题描述

我正在使用 swiftUI 进行编码，我有一个垂直的 scrollView(见截图)，在那个 scrollView 里面我有另一个水平的 scrollView，在它下面我有一个 VStack，我希望高度将屏幕的其余部分填充到垂直 scrollView 的底部，但我似乎无法做到工作.

垂直scrollView中的内容在某些情况下可能比实际剩余空间大，这就是为什么我需要一个scrollView，但在其他一些情况下，内容小于剩余空间

这是我的代码:

 VStack {标题视图ScrollView(.vertical, showsIndicators: false) {FriendsHorizo​​ntalScrollView()虚拟堆栈{//我希望这个视图占据 scrollView 中剩余的所有高度全高视图()}.frame(宽度:UIScreen.main.bounds.width)}}

我最终得到的是这样的:

我想要的:

我尝试了几种解决方案，例如使用 geometryReader 或将 .frame(maxHeight: .infinity) 放在 VStack 上，但似乎没有任何工作正常.

解决方案

这里是基于视图首选项的可能方法的演示(ViewHeightKey 取自我的

struct DemoLayoutInScrollView: View {@State 私有变量 height1:CGFloat = .zero@State 私有变量 height2:CGFloat = .zerovar主体:一些视图{VStack(间距:0){标题视图()GeometryReader { gp inScrollView(.vertical, showsIndicators: false) {VStack(间距:0){FriendsHorizo​​ntalScrollView().background(GeometryReader {颜色清晰.preference(key: ViewHeightKey.self, value: $0.frame(in: .local).size.height)}).onPreferenceChange(ViewHeightKey.self) { self.height1 = $0 }VStack(间距:0){//我希望这个视图占据 scrollView 中剩余的所有高度全高视图().background(GeometryReader {颜色清晰.preference(key: ViewHeightKey.self, value: $0.frame(in: .local).size.height)})}.frame(height: max(gp.size.height - self.height1, self.height2)).background(颜色.黄色)}}.onPreferenceChange(ViewHeightKey.self) { self.height2 = $0 }}}.frame(maxWidth: .infinity)}}

复制的辅助视图(用于测试)

struct FriendsHorizo​​ntalScrollView:查看{var主体:一些视图{文本(水平滚动条").frame(maxWidth: .infinity).frame(高度:100).background(颜色.绿色)}}struct FullHeightView:查看{var主体:一些视图{ZStack {红色文本(动态内容")}.frame(maxWidth: .infinity).frame(高度:300)}}结构头视图:查看{var主体:一些视图{矩形().foregroundColor(.blue).frame(高度:60).overlay(Text(Header"))}}

I am coding useing swiftUI and I have a vertical scrollView (see screenshots), and inside that scrollView I have another horizontal scrollView, and below that I have a VStack that I want the height to fill the rest of the screen to the bottom of the vertical scrollView, but I can't seem to make it work.

The content in the vertical scrollView can be larger than the actually remaining space in some cases that is why I need a scrollView, but in some other cases the content is smaller than the remaining space

Here is the code I have :

    VStack {
        HeaderView
        
        ScrollView(.vertical, showsIndicators: false) {
            FriendsHorizontalScrollView()
            
            VStack {
                // I want this view to take all the remaining height left in the scrollView
                FullHeightView()
            }
            .frame(width: UIScreen.main.bounds.width)
        }
    }

What I end up having is something like this :

What I want to have :

I have tried several solutions like using geometryReader or putting .frame(maxHeight: .infinity) on the VStack but nothing seems to work properly.

解决方案

Here is a demo of possible approach based on view preferences (ViewHeightKey is taken from my this solution. Tested with Xcode 12 / iOS 14.

struct DemoLayoutInScrollView: View {
    @State private var height1: CGFloat = .zero
    @State private var height2: CGFloat = .zero
    var body: some View {
        VStack(spacing: 0) {
            HeaderView()

            GeometryReader { gp in
                ScrollView(.vertical, showsIndicators: false) {
                    VStack(spacing: 0) {
                        FriendsHorizontalScrollView()
                            .background(GeometryReader {
                                Color.clear
                                    .preference(key: ViewHeightKey.self, value: $0.frame(in: .local).size.height)
                            })
                            .onPreferenceChange(ViewHeightKey.self) { self.height1 = $0 }
                        VStack(spacing: 0) {
                            // I want this view to take all the remaining height left in the scrollView
                            FullHeightView()
                                .background(GeometryReader {
                                    Color.clear
                                        .preference(key: ViewHeightKey.self, value: $0.frame(in: .local).size.height)
                                })
                        }.frame(height: max(gp.size.height - self.height1, self.height2))
                        .background(Color.yellow)
                    }
                }
                .onPreferenceChange(ViewHeightKey.self) { self.height2 = $0 }
            }
        }.frame(maxWidth: .infinity)
    }
}

replicated helper views (for testing)

struct FriendsHorizontalScrollView: View {
    var body: some View {
        Text("Horizontal Scroller")
            .frame(maxWidth: .infinity)
            .frame(height: 100)
            .background(Color.green)
    }
}

struct FullHeightView: View {
    var body: some View {
        ZStack {
            Color.red
            Text("Dynamic Content")
        }
        .frame(maxWidth: .infinity)
        .frame(height: 300)
    }
}

struct HeaderView: View {
    var body: some View {
        Rectangle().foregroundColor(.blue)
            .frame(height: 60)
            .overlay(Text("Header"))
    }
}

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