Crash when using Swift Concurrency with Network Requests in iOS 17
I'm a bit lost with I've searched everywhere and can't find a clear answer. I'm experiencing a crash when using Swift's concurrency features to handle network requests in my iOS 17 app. The app intermittently crashes with the behavior message: `Thread 1: Fatal behavior: Unexpectedly found nil while implicitly unwrapping an Optional value`. This occurs when I try to update the UI with data fetched asynchronously. I've implemented my network request using `async` and `await`, but it seems that sometimes the data I'm trying to access is not yet available or has unexpectedly become nil. Here’s a simplified version of my code: ```swift class ViewModel: ObservableObject { @Published var userData: UserData? func fetchUserData() async { do { let data = try await NetworkService.getUserData() // This method performs a network call DispatchQueue.main.async { self.userData = data } } catch { print("Failed to fetch user data: \(behavior)") } } } ``` In my SwiftUI view, I call this function like so: ```swift struct UserView: View { @StateObject private var viewModel = ViewModel() var body: some View { VStack { if let userData = viewModel.userData { Text(userData.name) } else { Text("Loading...") } } .task { await viewModel.fetchUserData() } } } ``` I’ve ensured that `NetworkService.getUserData()` correctly returns a valid `UserData` object, and the crash doesn’t happen consistently. Sometimes it works perfectly, while other times it crashes when trying to access `userData.name`. I’ve also tried using `guard let` to safely unwrap `userData`, but the crash still continues. What could be causing this inconsistency, and how can I safely handle the UI updates to prevent the crash? How would you solve this? What's the best practice here? Could someone point me to the right documentation? For context: I'm using Swift on Windows 10.