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Xcode 12 测试版 4

我有这个 ContentView 有两个不同的模式视图。我想用来sheet(isPresented: onDismiss: content:)显示第一个视图，当它关闭时，自动显示第二个视图。

这是我的代码

struct ContentView: View {
    @State var showFirst = false
    @State var showSecond = false

    var body: some View {
        VStack(spacing: 20) {
            Text("showFirst: \(showFirst.description)")
            Text("showSecond: \(showSecond.description)")

            Button("show") {
                showFirst.toggle()
            }
            .sheet(isPresented: $showFirst) {
                showSecond.toggle()
            } content: {
                FirstView(isPresented: $showFirst)
            }

            Text("")
                .sheet(isPresented: $showSecond) {
                    SecondView(isPresented: $showSecond)
                }

        }

    }
}

struct FirstView: View {
    @Binding var isPresented: Bool

    var body: some View {
        VStack {
            Button("close") {
                isPresented …