Unable to Persist User Session State in SwiftUI on iOS 17 with Combine
I just started working with I'm experiencing issues with persisting user session state in my SwiftUI application using Combine on iOS 17. I have a simple authentication flow where I retrieve a JWT token upon successful login, but it seems that the state is not being maintained when I navigate between views. Despite using `@StateObject` for my view model, the session information resets unexpectedly after a few view transitions. I am currently implementing the state management like this: ```swift class SessionViewModel: ObservableObject { @Published var userSession: String? = nil func login(username: String, password: String) { // Simulating a network login request DispatchQueue.main.asyncAfter(deadline: .now() + 1) { self.userSession = "fake_jwt_token" } } } ``` In my main view, I'm initializing `SessionViewModel` like this: ```swift struct ContentView: View { @StateObject var sessionViewModel = SessionViewModel() var body: some View { NavigationView { VStack { if let token = sessionViewModel.userSession { Text("Logged in with token: \(token)") Button("Logout") { sessionViewModel.userSession = nil } } else { Button("Login") { sessionViewModel.login(username: "user", password: "pass") } } NavigationLink(destination: DetailView(sessionViewModel: sessionViewModel)) { Text("Go to Detail") } } } } } ``` The `DetailView` is defined as follows: ```swift struct DetailView: View { @ObservedObject var sessionViewModel: SessionViewModel var body: some View { VStack { if let token = sessionViewModel.userSession { Text("Token in Detail: \(token)") } else { Text("No session active") } } } } ``` Even though I keep the same `SessionViewModel` instance when navigating to `DetailView`, the `userSession` property sometimes displays `nil`. I’ve verified that the login flow is successful, and the token is being set correctly. I also tried using `@EnvironmentObject` instead of `@StateObject`, but that didn't resolve the issue either. Is there a known issue with state persistence in SwiftUI on iOS 17, or am I missing something in my implementation? Any advice would be much appreciated.