авилUITextField вUIAlertController, Я хочу изменить высоту текстового поля. Я пробовал так:

let alertController = UIAlertController(title: "Comments", message: "Write your comments here", preferredStyle: UIAlertControllerStyle.alert)
alertController.addTextField { (textField : UITextField) -> Void in
    var frame: CGRect = textField.frame
    frame.size.height = 100
    textField.frame = frame
    textField.placeholder = "comment"
    print(textField.frame.size.height)
}

let cancelAction = UIAlertAction(title: "Cancel", style: UIAlertActionStyle.cancel) { (result : UIAlertAction) -> Void in
}

let okAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.default) { (result : UIAlertAction) -> Void in
}

alertController.addAction(cancelAction)
alertController.addAction(okAction)
self.present(alertController, animated: true, completion: nil)

Это не работает.