adding custom buttons etc to alerts

adding_custom_items_to_UIAlertController

@IBAction func showAlertButtonTapped(sender: UIButton) {
        
        // create the alert
        let alertController = UIAlertController(title: "Add Card", message: "Add your card details here and hit save\n\n\n", preferredStyle: UIAlertControllerStyle.Alert)
//        alertController.view.frame = CGRectMake(0, 0, self.view.bounds.size.width-20, 400)
        
//        let margin:CGFloat = 8.0
//        let rect = CGRectMake(margin, margin, alertController.view.bounds.size.width - margin * 4.0, 44)
//        let customView = UIView(frame: rect)
        paymentTextField.frame = CGRectMake(5, 75, alertController.view.bounds.size.width - 150, 44)//

        alertController.view.addSubview(paymentTextField)

        
        let cancelAction = UIAlertAction(title: "Cancel", style: UIAlertActionStyle.Cancel, handler: {(alert: UIAlertAction!) in print("cancel")})
        
        alertController.addAction(saveAction)
        alertController.addAction(cancelAction)
        
        self.presentViewController(alertController, animated: true, completion:{})    }