👀 Views: 211 💬 Answers: 1 📅 Created: 2025-06-12

swift swiftui observableobject

I'm following best practices but I've hit a wall trying to I've looked through the documentation and I'm still confused about I'm working with an scenario in my iOS app where using `@StateObject` is leading to a `nil` value unexpectedly when I try to access a property of my `ObservableObject`. I'm utilizing SwiftUI with iOS 15 and trying to implement a simple MVVM architecture. Here's a snippet of my code: ```swift import SwiftUI class MyViewModel: ObservableObject { @Published var data: String? func fetchData() { // Simulating a network fetch that might return nil let result: String? = nil // This simulates a failed fetch DispatchQueue.main.asyncAfter(deadline: .now() + 1) { self.data = result } } } struct MyView: View { @StateObject private var viewModel = MyViewModel() var body: some View { VStack { if let unwrappedData = viewModel.data { Text(unwrappedData) } else { Text("Loading...") } } .onAppear { viewModel.fetchData() } } } ``` When I run the app, everything looks good initially, but after the fetch completes, I get the following behavior in the console: ``` Unexpectedly found nil while unwrapping an Optional value ``` This happens even though I am checking if `data` is `nil` before trying to access it. I suspect that the scenario might be related to how SwiftUI updates the view or how `@StateObject` is being initialized. I tried moving the initialization of `viewModel` to `init` of `MyView`, but it still results in the same behavior. Has anyone experienced similar issues with `@StateObject` and could suggest best practices for managing the lifecycle of ObservableObjects in SwiftUI? Any insights on this would be greatly appreciated! I'd really appreciate any guidance on this. My development environment is Ubuntu. Is there a better approach? I'm working on a REST API that needs to handle this. This issue appeared after updating to Swift 3.11. Has anyone dealt with something similar?