move up UIAlertController style Alert with UITextView when keyboard is present - ios

Question

i have an AlertController with UITextView.
when UITexView become first responder the alter doesn't move up with the keyboard.
this is my code:
#IBAction func showAlert(sender: AnyObject) {
let alertController = UIAlertController(title: "Hello, I'm alert! \n\n\n\n\n\n\n", message: "", preferredStyle: .alert)
let rect = CGRect(x: 15, y: 15, width: 240, height: 150)//CGRectMake(15, 50, 240, 150.0)
let textView = UITextView(frame: rect)
textView.font = UIFont(name: "Helvetica", size: 15)
textView.textColor = UIColor.lightGray
textView.backgroundColor = UIColor.white
textView.layer.borderColor = UIColor.lightGray.cgColor
textView.layer.borderWidth = 1.0
textView.text = "Enter message here"
textView.delegate = self
alertController.view.addSubview(textView)
let cancel = UIAlertAction(title: "Cancel", style: .cancel, handler: nil)
let action = UIAlertAction(title: "Ok", style: .default, handler: { action in
let msg = (textView.textColor == UIColor.lightGray) ? "" : textView.text
print(msg!)
})
alertController.addAction(cancel)
alertController.addAction(action)
self.present(alertController, animated: true, completion: {
textView.becomeFirstResponder()
})
}
and this is my result:
there is a solution?
thanks in advance

Answer 1

just addTextField and then remove it
alert.addTextField { field in
field.translatesAutoresizingMaskIntoConstraints = false
field.heightAnchor.constraint(equalToConstant: 0).isActive = true
}
let inCntrlr = alert.childViewControllers[0].view!
inCntrlr.removeFromSuperview()
and then you could add your own views. here is a
result

Answer 2

After presenting alert controller. Open keyboard for TextView and move alert controller up.
I hope this will suite for you.
self.present(alertController, animated: true, completion: {
textView.becomeFirstResponder()
UIView.animate(withDuration: 0.5, animations: {
alertController.view.frame.origin.y = 100
})
})

Answer 3

UIAlertController by default will slide up when they keyboard is shown. The problem here is that you have added a subview to the alert controller. From the UIAlertController docs:
The UIAlertController class is intended to be used as-is and does not
support subclassing. The view hierarchy for this class is private and
must not be modified.
Adding your own subview to the alert goes against what the docs say and is likely what is causing your problem. If you need an alert with a text view in it, your best bet is to create your own view and manage it yourself.

Answer 4

I created this drop-in replacement, also customizable for any special needs of course. It's pretty simple and 'just works'!
https://gist.github.com/unixb0y/42a1ae0fb707bdb5e1e484bafd33d44a
It is a subclass of UIAlertController with a UITextView inside.
When it is initialized, it observes keyboard changes and adjusts its view.frame.origin.y accordingly.
var keyboardHeight: CGFloat = 100 {
didSet {
let height = UIScreen.main.bounds.height
let menu = self.view.frame.height
let keyb = self.keyboardHeight
self.view.frame.origin.y = height-menu-keyb-20
}
}
...
...
...
#objc func keyboardChange(sender: Notification) {
guard let userInfo = sender.userInfo else { return }
let endFrame = userInfo[UIResponder.keyboardFrameEndUserInfoKey] as? CGRect
keyboardHeight = endFrame?.height ?? 100
}

Answer 5

It's like. You open keyboard and change alert position.
var alertController = UIAlertController(title: nil, message: nil, preferredStyle: UIAlertController.Style.alert)
var alertControllerPositon:CGFloat = 0
override func viewDidLoad() {
super.viewDidLoad()
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow), name: UIResponder.keyboardWillShowNotification, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide), name: UIResponder.keyboardWillHideNotification, object: nil)
}
#IBAction func showAlert(sender: AnyObject) {
let alertController = UIAlertController(title: "Hello, I'm alert! \n\n\n\n\n\n\n", message: "", preferredStyle: .alert)
let rect = CGRect(x: 15, y: 15, width: 240, height: 150)//CGRectMake(15, 50, 240, 150.0)
let textView = UITextView(frame: rect)
textView.font = UIFont(name: "Helvetica", size: 15)
textView.textColor = UIColor.lightGray
textView.backgroundColor = UIColor.white
textView.layer.borderColor = UIColor.lightGray.cgColor
textView.layer.borderWidth = 1.0
textView.text = "Enter message here"
textView.delegate = self
alertController.view.addSubview(textView)
let cancel = UIAlertAction(title: "Cancel", style: .cancel, handler: nil)
let action = UIAlertAction(title: "Ok", style: .default, handler: { action in
let msg = (textView.textColor == UIColor.lightGray) ? "" : textView.text
print(msg!)
})
alertController.addAction(cancel)
alertController.addAction(action)
self.present(alertController, animated: true, completion: {
textView.becomeFirstResponder()
})
alertControllerPositon = alertController.view.frame.origin.y
}
#objc func keyboardWillShow(notification: NSNotification) {
if let keyboardSize = (notification.userInfo?[UIResponder.keyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
alertControllerPositon = alertController.view.frame.origin.y
let result = self.view.frame.height - (alertController.view.frame.height + alertController.view.frame.origin.y) - 20
self.alertController.view.frame.origin.y -= (keyboardSize.height - result)
}
}
#objc func keyboardWillHide(notification: NSNotification) {
if self.alertController.view.frame.origin.y != alertControllerPositon {
self.alertController.view.frame.origin.y = alertControllerPositon
}
}