AlertDialog with Textfield

*****

let alertController = UIAlertController(title: "Your Title", message: "Your Subtitle here", preferredStyle: UIAlertControllerStyle.alert)

        

        alertController.addTextField(configurationHandler: nil)

        

        let OKAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.default) { (action) -> Void in

            

        }

        

        alertController.addAction(OKAction)

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

******

       // IF DATA NULL, CALL YOUR METHOD

//        let OKAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.default) { (action) -> Void in

//            let textfield = alertController.textFields![0]

//            if textfield.text?.characters.count == 0 {

//

//              //  self.askForNickname()

//            }

//            else {

//

//            }