If I initiate the NavigationStack with a path and traverse upwards with the back button, onAppear doesn’t trigger for the views I’m traversing. However, if I manually traverse the same path downwards, navigating back is triggered on every view as expected. I want to track the value for the screen presented outside the NavigationStack. Explanations and alternative tracking solutions are welcome.

Here are my actions and output:

Starting the application with an initial navigation path:

onAppear view: 0

onAppear view: 1

onAppear view: 2

Navigating up to view 0:

(Expected output:

onAppear view: 1

onAppear view: 0)

Output:

…nothing

Navigating down manually:

onAppear view: 1

onAppear view: 2

Navigating up to view 0:

(Now I get the expected output)

onAppear view: 1

onAppear view: 0

import SwiftUI

struct SwiftUIView: View {
    @State private var navigationPath: NavigationPath

    init() {
        var startPath = NavigationPath()
        startPath.append(1)
        startPath.append(2)
        self._navigationPath = State(initialValue: startPath)
    }
    var body: some View {
        NavigationStack(path: $navigationPath) {
            Text("View 0")
                .navigationDestination(for: Int.self) { number in
                    MyDestinationView(number: number)
                }
                .onAppear {
                    print("onAppear view: 0")
                }
            NavigationLink("Next", value: 1)
        }
    }
}

struct MyDestinationView: View {
    let number: Int
    var body: some View {
        Text("I'm view: (number)")
            .onAppear {
                print("onAppear view: (number)")
            }
        NavigationLink("Next", value: number + 1)
    }
}

#Preview {
    SwiftUIView()
}