How to Create a Global UIAlertController in Swift...

 Add this code in any Class (As UIViewController extension)  as shown below

extension UIViewController {

    

    func alert(message: String, title: String ) {

        let alertController = UIAlertController(title: title, message: message, preferredStyle: .alert)

        let OKAction = UIAlertAction(title: "OK", style: .default, handler: nil)

        alertController.addAction(OKAction)

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

    }

    

}

and call it anywhere(In  Any ViewController) as shown below,

   self.alert(message: "Some message", title: "Title of Alert")