If you’re instancing your UIAlertController
from a modal controller, you need to do it in viewDidAppear
, not in viewDidLoad
or you’ll get an error.
Here’s my code (Swift 4):
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
let alertController = UIAlertController(title: "Foo", message: "Bar", preferredStyle: .alert)
alertController.addAction(UIAlertAction(title: "OK", style: .cancel, handler: nil))
present(alertController, animated: true, completion: nil)
}