SwiftUINavigationLink自行弹出

我有一个简单的用例，其中一个屏幕使用NavigationLink. iOS 14.5 beta (1, 2, 3) 有一个奇怪的行为，推送的屏幕在被推送后就弹出。

我设法创建了一个示例应用程序，并在其中重现它。我相信原因是存在@Environment(.presentationMode)似乎重新创建视图并导致弹出视图的原因。

完全相同的 cod 在 Xcode 12 / iOS 14.4 中运行良好

这是一个示例代码。

import SwiftUI

public struct FirstScreen: View {
    public init() {}
    public var body: some View {
        NavigationView {
            List {
                row
                row
                row
            }
        }
    }
    private var row: some View {
        NavigationLink(destination: SecondScreen()) {
            Text("Row")
        }
    }
}

struct SecondScreen: View {

    @Environment(.presentationMode) var presentationMode: Binding<PresentationMode>

    public var body: some View {
        VStack(spacing: 10) {
            NavigationLink(destination: thirdScreenA) {
                Text("Link to Third Screen A")
            }

            NavigationLink(destination: thirdScreenB) {
                Text("Link to Third Screen B")
            }

            Button("Go back", action: { presentationMode.wrappedValue.dismiss() })
        }

    }

    var thirdScreenA: some View {
        Text("thirdScreenA")
    }

    var thirdScreenB: some View {
        Text("thirdScreenB")
    }
}


struct FirstScreen_Previews: PreviewProvider {
    static var previews: some View {
        FirstScreen()
    }
}

回答

NavigationLink(destination: EmptyView(), label: {})