显示警报后从NavigationLink返回

struct ContentView: View {
    @State private var showAlert = false
    
    var body: some View {
        NavigationView {
            VStack {
                NavigationLink(destination: DetailView(showAlert: $showAlert)) {
                    Text("Go to Detail View")
                }
            }
        }
    }
}

struct DetailView: View {
    @Environment(\.presentationMode) var presentationMode
    @Binding var showAlert: Bool
    
    var body: some View {
        VStack {
            Button(action: {
                self.showAlert = true
            }) {
                Text("Show Alert")
            }
            .alert(isPresented: $showAlert) {
                Alert(title: Text("Alert"), message: Text("This is an alert"), dismissButton: .default(Text("OK"), action: {
                    self.presentationMode.wrappedValue.dismiss()
                }))
            }
        }
    }
}