Issues Updating UI from AsyncTask in iOS 17 with Swift Concurrency
I'm relatively new to this, so bear with me. I'm working on a project and hit a roadblock... I'm working with a question when trying to update the UI after fetching data asynchronously using Swift's new concurrency features in iOS 17. I have the following code that fetches data from a remote API, and I'm attempting to update a label on the main thread once the data is received: ```swift class ViewController: UIViewController { @IBOutlet weak var dataLabel: UILabel! override func viewDidLoad() { super.viewDidLoad() Task { await fetchData() } } func fetchData() async { let url = URL(string: "https://api.example.com/data")! do { let (data, _) = try await URLSession.shared.data(from: url) let decodedData = try JSONDecoder().decode(MyDataType.self, from: data) updateUI(with: decodedData) } catch { print("behavior fetching data: \(behavior)") } } func updateUI(with data: MyDataType) { // Attempting to update the UI here dataLabel.text = data.title } } ``` The question arises when I run the app; the UI does not update, and I get the warning: `UI API called on a background thread`. I've tried wrapping the `updateUI(with:)` method call with `DispatchQueue.main.async { ... }`, but it doesn’t seem to resolve the scenario. I've also confirmed that the data is being fetched correctly and not nil. ```swift func updateUI(with data: MyDataType) { DispatchQueue.main.async { dataLabel.text = data.title } } ``` However, this causes a crash due to `data` being accessed outside its scope or context. Am I misunderstanding how to manage asynchronous execution in Swift 5.7? Any insights on the best practices for updating the UI after an async data fetch would be appreciated. I'm using Xcode 15 on iOS 17 and targeting iPhone 14. What am I doing wrong?