NavigationDestination not working

[seanmrich]

I have a little project that uses the observation-beta, and I haven't been able to get drill-down navigation to work. To figure it out, I tried the SwiftUICaseStudies example, stripping it down to just the Navigation-Multiple-Destinations piece related to drill-down navigation. Here's the modified reducer:

@Reducer
struct MultipleDestinations {
  @Reducer
  public struct Destination {
    @ObservableState
    public enum State: Equatable {
      case drillDown(Counter.State)
    }
    public enum Action {
      case drillDown(Counter.Action)
    }
    public var body: some Reducer<State, Action> {
      Scope(state: \.drillDown, action: \.drillDown) {
        Counter()
      }
    }
  }

  @ObservableState
  struct State: Equatable {
    @Presents var destination: Destination.State?
  }

  enum Action {
    case destination(PresentationAction<Destination.Action>)
    case showDrillDown
  }

  var body: some Reducer<State, Action> {
    Reduce { state, action in
      switch action {
      case .showDrillDown:
        state.destination = .drillDown(Counter.State())
        return .none
      case .destination:
        return .none
      }
    }
    .ifLet(\.$destination, action: \.destination) {
      Destination()
    }
  }
}

... and the view:

struct MultipleDestinationsView: View {
  @Bindable var store = Store(initialState: MultipleDestinations.State()) {
    MultipleDestinations()
  }

  var body: some View {
    Form {
      Button("Show drill-down") {
        store.send(.showDrillDown)
      }
    }
    .navigationDestination(
      item: $store.scope(state: \.destination?.drillDown, action: \.destination.drillDown)
    ) { store in
      CounterView(store: store)
    }
  }
}

The view is the root of the app:

@main
struct NavTestApp: App {
  let store = Store(
    initialState: MultipleDestinations.State()) {
      MultipleDestinations()
    }
  
  var body: some Scene {
    WindowGroup {
      NavigationView {
        MultipleDestinationsView(store: store)
      }
    }
  }
}

Clicking on the Show drill-down button does nothing. This seems basic enough that I'm probably missing something obvious, but would appreciate a little direction.

[mbrandonw]

Hi @seanmrich, can you try using NavigationStack instead of NavigationView? I'm not sure the navigationDestination view modifier works with the old, deprecated view.

[seanmrich]

Yup, that was it. I've been working on macOS for a few years now, so I'm out of touch on the iOS state of the art. Thanks for putting me straight 🙏