Enum Case Switching Works on Simulator but Not on Device for Screen Transitions

[imhans]

I'm attempting to switch screens based on different cases of an enum Reducer. The implementation works perfectly on the simulator, but when I run the same code on an actual device (specifically, an iPhone Xs running iOS 16), the screen transitions do not occur. The issue seems to be related to the view rendering part, as the received action logs indicate the state changes as expected but the screen does not update accordingly. Below is a version of my code and the debug log showing the state transition

@Reducer(state: .equatable)
enum ClinicalAdhd {
    case splash(Splash)
    case login(Login)
    case main(Main)
    
    static var body: some ReducerOf<Self> {
        Reduce { state, action in
            switch action {                
            case .splash(.done):
                state = .login(Login.State())
                return .none
                
            case .splash(.main):
                state = .main(Main.State())
                return .none
                
            // Other cases omitted for brevity
            }
        }
        .ifCaseLet(\.splash, action: \.splash) {
            Splash()
        }
        .ifCaseLet(\.login, action: \.login) {
            Login()
        }
        .ifCaseLet(\.main, action: \.main) {
            Main()
        }
    }
}

received action:
  ClinicalAdhd.Action.splash(.main)
- ClinicalAdhd.State.splash(
-   Splash.State(
-   )
- )
+ ClinicalAdhd.State.main(
+   Main.State(
+     _path: [:]
+   )
+ )

struct AppView: View {
    @Perception.Bindable var store: StoreOf<ClinicalAdhd>
    
    init(store: StoreOf<ClinicalAdhd>) {
        self.store = store
    }
    
    var body: some View {
        WithPerceptionTracking {
            switch store.case {
            case let .splash(store):
                SplashView(store: store)
                
            case let .login(store):
                LoginView(store: store)
                
            case let .main(store):
                MainView(store: store)
            }
        }
    }
}

I've checked for any obvious differences between the simulator and device environments, but everything seems identical. Could there be any specific reasons why this issue occurs on the device but not on the simulator? What steps can I take to diagnose and resolve this issue?

[mbrandonw]

Hi @imhans, are you running an iOS 16 simulator too? And can you provide a minimal project that reproduces the problem so that we can investigate?

[imhans]

Hi @mbrandonw, yes, I was using an iOS 16 simulator for my tests. While preparing a minimal project to share for troubleshooting, I actually discovered the solution to the problem. The issue was with the parent view that wraps the AppView, which was enclosed in a NavigationStack. Removing the NavigationStack wrapping resolved the issue, and everything now works as expected. It seems there are some considerations to be aware of when using NavigationStack. Thank you for your reply!