👀 Views: 597 💬 Answers: 1 📅 Created: 2025-06-14

swift swiftui combine ios17

I'm collaborating on a project where I've been researching this but I'm experiencing an scenario where my SwiftUI List is not updating correctly after fetching data from a remote API... I am using Combine to handle the data fetching and updating the state, but it seems the List doesn't reflect the latest changes after the data is received. Here's a simplified version of my ViewModel: ```swift import SwiftUI import Combine class DataViewModel: ObservableObject { @Published var items: [String] = [] private var cancellable: AnyCancellable? func fetchData() { let url = URL(string: "https://api.example.com/items")! cancellable = URLSession.shared.dataTaskPublisher(for: url) .map { $0.data } .decode(type: [String].self, decoder: JSONDecoder()) .replaceError(with: []) .receive(on: DispatchQueue.main) .assign(to: &$items) } } ``` In my SwiftUI view, I have: ```swift struct ContentView: View { @StateObject private var viewModel = DataViewModel() var body: some View { List(viewModel.items, id: \.self) { item in Text(item) } .onAppear { viewModel.fetchData() } } } ``` The question I'm working with is that the List does not update when `viewModel.items` changes. I can see that the data is being fetched correctly because I printed the items in the console, but the UI does not reflect this change. I've tried using `print(viewModel.items)` right after the assignment in the `fetchData` method, and I can confirm it has the expected data. I ensured that my `fetchData` method is being called on view appearance, but there’s still no update in the List. No errors are thrown, and I am testing on iOS 17 with Xcode 15. I’ve even tried forcing a manual refresh by adding a button that triggers `fetchData`, but it behaves the same way. Has anyone else encountered this scenario? What could I be missing? For context: I'm using Swift on Debian. Thanks for taking the time to read this! This is for a CLI tool running on Windows 10. Hoping someone can shed some light on this.