Stack based navigation throw error when write to userdefault in reducer and use scenePhase environment key about swift-composable-architecture HOT 1 CLOSED

@Doraemoe Your root app scene is creating a brand new store in its body, so when it detects a scene change your state is replaced with a brand new store with no path, which puts SwiftUI in a bad state. I believe you'd have the same problem in vanilla SwiftUI using an observable object.

The fix is to hold onto your store in your app so that it is never recreated:

@main
struct userdefault_tcaApp: App {
  @Environment(\.scenePhase) var scenePhase
  let store = Store(initialState: RootFeature.State()) {
    RootFeature()
  }

  var body: some Scene {
    WindowGroup {
      ContentView(store: self.store)
    }
  }
}

In general you should not create new models in the body of scenes or views as SwiftUI's observation can recreate them at any time.

Since this isn't a bug with the library, I'm going to convert it to a discussion instead.

from swift-composable-architecture.