Question

我正在尝试制作一个将Blur（）放在iPhone布局底部的视图，同时遵守安全区，并且我可以轻松地重用。

类似这样的东西：

import SwiftUI

struct SafeBottomBlurContainer: View {
    @Environment(\.colorScheme) var colorScheme
    var body: some View {
        GeometryReader { geometry in
            VStack {
                Spacer()
                ZStack {
                    Blur(style:  self.colorScheme == .dark ? .systemThinMaterialDark : .systemThinMaterialLight)
                        .frame(
                            width: geometry.size.width,
                            height: geometry.safeAreaInsets.bottom + 50
                        )
                        Holder()
                            .padding(.bottom, geometry.safeAreaInsets.bottom)
                }
            }
            .edgesIgnoringSafeArea(.bottom)
        }
    }
}

struct Holder: View {
    var body: some View {
        Rectangle().opacity(0.5)
            .frame(height: 50)
    }
}


struct SafeBottomBlurContainer_Previews: PreviewProvider {
    
    static var previews: some View {
        SafeBottomBlurContainer()
    }
}

顺便说一下，这是~~ blue ~~模糊扩展名：

import SwiftUI

struct Blur: UIViewRepresentable {
    var style: UIBlurEffect.Style = .systemMaterial
    func makeUIView(context: Context) -> UIVisualEffectView {
        return UIVisualEffectView(effect: UIBlurEffect(style: style))
    }
    func updateUIView(_ uiView: UIVisualEffectView, context: Context) {
        uiView.effect = UIBlurEffect(style: style)
    }
}

现在，我想做的是以某种方式传入Holder()，以便我可以调整“模糊”的高度（这里是+ 50）。我觉得我应该以某种方式使用AnyView，但无法弄清楚。可能是我走错了路。

这是我希望在ContentView（）示例中使用它的方式：

import SwiftUI

struct ContentView: View {
    var body: some View {
        
        ZStack {
            Color.pink.edgesIgnoringSafeArea(.all)
            SafeBottomBlurContainer(containedView: MyCustomViewWithWhateverHeight)
        }
    }
}

Answer 1

这是一种可能的方法，它使使用像这样的容器成为可能

struct ContentView: View {
    var body: some View {
        
        ZStack {
            Color.pink.edgesIgnoringSafeArea(.all)

            // holder is not needed, because you can pass any view directly
            SafeBottomBlurContainer(containedView: Text("Demo"))
        }
    }
}

和通用模糊容器

struct SafeBottomBlurContainer<V: View>: View {
    @Environment(\.colorScheme) var colorScheme

    var containedView: V
    var body: some View {
        GeometryReader { geometry in
            VStack {
                Spacer()
                ZStack {
                    Blur(style:  self.colorScheme == .dark ? .systemThinMaterialDark : .systemThinMaterialLight)
                        .frame(
                            width: geometry.size.width,
                            height: geometry.safeAreaInsets.bottom + 50
                        )
                        containedView
                            .padding(.bottom, geometry.safeAreaInsets.bottom)
                }
            }
            .edgesIgnoringSafeArea(.bottom)
        }
    }
}

Answer 2

从@Asperi带领我真正走上正轨，现在，我有了这个想法，试图也适应这个Blur()视图应该在屏幕的顶部还是底部：

import SwiftUI

struct SafeEdgesBlurContainer<V: View>: View {
    @Environment(\.colorScheme) var colorScheme
    @State var containedViewSize: CGSize = .zero
    var containedView: V
    var isPlacedAtTop: Bool
    var body: some View {
        GeometryReader { geometry in
            VStack {
                if !isPlacedAtTop {
                Spacer()
                }
                ZStack {
                    Blur(style:  self.colorScheme == .dark ? .systemThinMaterialDark : .systemThinMaterialLight)
                        .frame(
                            width: geometry.size.width + geometry.safeAreaInsets.leading + geometry.safeAreaInsets.trailing,
                            height: (isPlacedAtTop ? geometry.safeAreaInsets.top : geometry.safeAreaInsets.bottom ) + containedViewSize.height
                        )
                        .edgesIgnoringSafeArea([.leading])
                    HStack {
                        ChildSizeReader(size: $containedViewSize) {
                                containedView
                        }
                        .frame(width: geometry.size.width)  // ADDED This line to keep the ContainedView centered in Landscape
                        .padding(isPlacedAtTop ? .top : .bottom, isPlacedAtTop ? geometry.safeAreaInsets.top : geometry.safeAreaInsets.bottom)
                    }
                }
                if isPlacedAtTop {
                Spacer()
                }
            }
            .edgesIgnoringSafeArea(isPlacedAtTop ? .top : .bottom)
        }
    }
}

事实证明，获取ContainedView（）的高度并不难。我从这里找到了这个解决方案：SwiftUI - Get size of child?

struct ChildSizeReader<Content: View>: View {
    @Binding var size: CGSize
    let content: () -> Content
    var body: some View {
        ZStack {
            content()
                .background(
                    GeometryReader { proxy in
                        Color.clear
                            .preference(key: SizePreferenceKey.self, value: proxy.size)
                    }
                )
        }
        .onPreferenceChange(SizePreferenceKey.self) { preferences in
            self.size = preferences
        }
    }
}

struct SizePreferenceKey: PreferenceKey {
    typealias Value = CGSize
    static var defaultValue: Value = .zero

    static func reduce(value _: inout Value, nextValue: () -> Value) {
        _ = nextValue()
    }
}

我看到的剩下的问题是ContainedView（）不在横向视图中居中。但希望我能很快回来并为此提供解决方案。

编辑：这可能是该解决方案：HStack上的.frame(width: geometry.size.width)。

如何在同时获取视图高度的同时将视图传递给结构？

2 个答案: