can i call UIAlertController out of IBAction [duplicate] - ios

Question

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Present UIAlertController from AppDelegate [duplicate]
(7 answers)
Closed 3 years ago.
I am trying to make an alert on my app, but it keeps giving me warning like the below and it's not appearing
Warning: Attempt to present <UIAlertController: 0x..> on <xyz.VC1: 0x..> whose view is not in the window hierarchy!
the logic is like this :-
the IBAction in (VC1) calls a public function (X)
(X) the function do some operation and functions and based on it it's called the public function (Alert)
(Alert) the function should present an alert, but it gives me the previous warning.
NOTE: the alert works fine if I use it directly from the IBAction
present the alert :
func WAlert(){
// print("Wrong :("") // to be an alert
let alert = UIAlertController(title: "S?", message: "Y", preferredStyle: UIAlertController.Style.alert)
alert.addAction(UIAlertAction(title: "C", style: UIAlertAction.Style.default, handler: { _ in
//Cancel Action
}))
alert.addAction(UIAlertAction(title: "out",
style: UIAlertAction.Style.default,
handler: {(_: UIAlertAction!) in
//Sign out action
}))
present(alert, animated: true, completion: nil)
//self.present(alert, animated: true, completion: nil)
//VC1.present(alert, animated: true, completion: nil)

Answer 1

You probably need to have the function return the alert, rather than presenting it, and then present it (self.present) from VC1. As Teja Nandamuri mentions in comments, an alert must be presented from a visible UIViewController.
Revised based on comment:
You can generate the alert in a separate function, like your WAlert, but still present it in VC1, even in the IBAction. For instance, in the action you would have:
let alert = WAlert()
self.present(alert, animated: true)
You would need to change WAlert as follows:
func WAlert() -> UIAlertController {
let alert = UIAlertController(title: "S?", message: "Y", preferredStyle: UIAlertController.Style.alert)
alert.addAction(UIAlertAction(title: "C", style: UIAlertAction.Style.default, handler: { _ in
//Cancel Action
}))
alert.addAction(UIAlertAction(title: "out", style: UIAlertAction.Style.default, handler: {(_: UIAlertAction!) in
//Sign out action
}))
return alert