How do I reset a selection tag when pushing a NavigationLink programmatically?

Question

I want to push a view programmatically instead of relying on the interface that NavigationLink provides (e.g. I want to use a button with no chevron). The correct way is to use NavigationLink with tag and selection, and an EmptyView.

When I attempt to use the following code to push a view, it works to push the view the first time:

struct PushExample: View {
  @State private var pushedView: Int? = nil

  var body: some View {
    NavigationView {
      VStack {
        Form {
          Button(action: { self.pushedView = 1 }) { Text("Push view") }
        }

        NavigationLink(destination: Text("Detail view"), tag: 1, selection: $pushedView) { EmptyView() }
      }
    }
  }
}

However, if I tap the back button on the view, and try hitting the button again, it no longer pushes the view. This is because the value pushedView is being set to 1 again, but it is already at 1. Nothing is resetting it back to nil upon pop of the Detail view.

How do I get subsequent taps of the button to push the view again?

Answer 1

TL;DR: There is no need to reset the state variable, as SwiftUI will automatically handle it for you. If it's not, it may be a bug with the simulator.

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This was a simulator bug on Xcode 11.3!

The way to check if it's a simulator bug is to run an even simpler example:

struct ContentView: View {
  var body: some View {
    NavigationView {
      NavigationLink("Push", destination: Text("Detail"))
    }
  }
}

On the Xcode 11.3 iPhone 11 Pro Max, this would only work the first time you tap the link.

This worked fine on both a 13.2 and a 13.3 device.

Therefore, when running into odd SwiftUI issues, test on device rather than the simulator.

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Update: Restarting the computer didn't fix it either. Thus while SwiftUI is still new, may be better off to use a real device for testing rather than the simulator.