Async/await UIAlertController

I needed to show an alert in an async context and this is how I achieved it:

func loseEditsAlert() async throws {
    
    try await withCheckedThrowingContinuation { continuation in
        
        let alert = UIAlertController(title: "Opening link", message: "OK to lose your edits?", preferredStyle: .alert)

        let action = UIAlertAction(title: NSLocalizedString("OK", comment: "Default action"), style: .default) { _ in
            continuation.resume()
        }
        
        let cancel = UIAlertAction(title: "Cancel", style: .cancel) { _ in
            continuation.resume(throwing: CancellationError())
        }
        
        alert.addAction(action)
        alert.addAction(cancel)

        present(alert, animated: true)
    }
    
}

The idea to throw a cancellation exception was inspired by DDDevicePickerViewController which is the only built-in async UIViewController I’m aware of.