在没有 NavigationView 的 SwiftUI 中创建 NavigationLink

Question

So I found this amazing piece of code which uses presentationMode environment variable to archive transition between views without NavigationView:

import SwiftUI

struct View2: View {
    @Environment(\.presentationMode) var presentationMode: Binding<PresentationMode>

    var body: some View {
        VStack {
            Button(action: {
                self.presentationMode.wrappedValue.dismiss()
            }) {
                Text("POP")
            }
        }
        .navigationBarTitle("")
        .navigationBarBackButtonHidden(true)
        .navigationBarHidden(true)
    }
}

struct ContentView: View {
    var body: some View {
        NavigationView {
            NavigationLink(destination: View2()) {
                Text("PUSH")
                    .navigationBarTitle("")
                    .navigationBarHidden(true)
            }
        }
    }
}

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

but when I wrap it in another View (which is what I need to do in my own app):

import SwiftUI

struct View2: View {
    @SwiftUI.Environment(\.presentationMode) var presentationMode: Binding<PresentationMode>

    var body: some View {
        VStack {
            Button(action: {
                self.presentationMode.wrappedValue.dismiss()
            }) {
                Text("POP")
            }
        }
        .navigationBarTitle("")
        .navigationBarBackButtonHidden(true)
        .navigationBarHidden(true)
    }
}

struct Playground: View {
    var index: Int
    var body: some View {
        NavigationView {
            NavigationLink(destination: View2()) {
                Text("PUSH #\(index)")
                    .navigationBarTitle("")
                    .navigationBarHidden(true)
            }
        }
    }
}

struct Playgrounds: View {
    var body: some View {
        VStack {
            Text("List of bush buttons").font(.title)
            List(0..<5, id: \.self) { index in
                HStack {
                    Playground(index: index)
                }
            }
        }
    }
}

struct Playground_Previews: PreviewProvider {
    static var previews: some View {
        Playgrounds()
    }
}

I can only see a list of "back" buttons (without their labels!): instead of a list of "Push #1", "Push #2" etc (which should open View2 onClick event). How can I fix it?

Answer 1

You only need one NavigationView instead of defining a NavigationView for each NavigationLink :

struct Playground: View {
    var index: Int
    var body: some View {
        NavigationLink(destination: View2()) {
            Text("PUSH #\(index)")
        }
    }
}

struct Playgrounds: View {
    var body: some View {
        NavigationView {
            VStack {
                Text("List of bush buttons").font(.title)
                List(0..<5, id: \.self) { index in
                    HStack {
                        Playground(index: index)
                    }
                }
            }
            .navigationBarTitle("")
            .navigationBarHidden(true)
        }
    }
}