alertview textField returning nil value : let editTextField = UITextField()
        let alertController = UIAlertController(title: "Alert!", message: "Please enter from location", preferredStyle: .alert)
        alertController.addTextField { editTextField in
            editTextField.placeholder = "Enter correct name"
           // editTextField.text = self.fromLocationLbl.text
        }
        let confirmAction = UIAlertAction(title: "Change", style: UIAlertActionStyle.default) { (UIAlertAction) in
            print(editTextField.text) ///////printing optional("")
            self.fromLocationLbl.text = editTextField.text
        }
        alertController.addAction(confirmAction)
        let cancelAction = UIAlertAction(title: "Cancel", style: .cancel, handler: nil)
        alertController.addAction(cancelAction)
        present(alertController, animated: true, completion: nil)
        