SwiftUI中NavigationLink后用presentationDetents的selection放大Sheet致视图截断

问题现象 #

自iOS 16起，.sheet修饰器新增presentationDetents特性，支持通过selection绑定参数以编程方式调整Sheet尺寸。但存在以下异常：

• 当通过NavigationLink跳转页面后，立即将Sheet从PresentationDetent.medium切换至PresentationDetent.large，Sheet内的视图会出现截断
• 轻微拖动调整Sheet后，截断现象会消失，但视图层级仍存在异常

临时解决办法 #

为Sheet尺寸调整操作添加0.6秒延迟，即可规避截断问题。核心代码片段：

.onAppear {
    DispatchQueue.main.asyncAfter(deadline: .now() + 0.6) {
        currentSelection = .large
    }
}

完整示例代码 #

import SwiftUI

struct ContentView: View {
    @State private var sheetIsOpened = false
    @State private var currentSelection = PresentationDetent.medium
    
    var body: some View {
        Text("Click to open a sheet")
            .padding()
            .onTapGesture {
                sheetIsOpened = true
            }
            .sheet(isPresented: $sheetIsOpened) {
                NavigationStack {
                    List {
                        ScrollView {
                            ForEach(0..<100) { index in
                                VStack {
                                    NavigationLink(destination: NavigatedView(currentSelection: $currentSelection)) {
                                        Text("I have the index: \(index)")
                                            .foregroundColor(.green)
                                    }
                                }
                                .frame(maxWidth: .infinity)
                            }
                        }
                        .padding()
                    }
                }
                .presentationDetents([.medium, .large], selection: $currentSelection)
            }
    }
}

struct NavigatedView: View {
    @Binding fileprivate var currentSelection: PresentationDetent
    
    var body: some View {
        ScrollView {
            ForEach(0..<100) { index in
                VStack {
                    Text("I'm a child and I have the index: \(index)")
                        .onAppear {
                            DispatchQueue.main.asyncAfter(deadline: .now() + 0.6) {
                                currentSelection = .large
                            }
                        }
                }
                .frame(maxWidth: .infinity)
            }
        }
        .background(.red)
        .padding()
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}

内容的提问来源于stack exchange，提问作者Gipfeli