extension UIViewController {

    func presentInfoAlert(_ viewcontroller: UIViewController, withTitle title: String = "", message : String, completion: ((String) -> Swift.Void)? = nil) {

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

        let OKAction = UIAlertAction(title: "확인", style: .default) { action in
            if completion != nil {
                completion!("OK")
            }
        }

        alertController.addAction(OKAction)
        viewcontroller.present(alertController, animated: true, completion: nil)
    }

    func presentComformAlert(_ viewcontroller: UIViewController, withTitle title: String = "", cancel: String = "취소", ok: String = "확인", message : String,  completion: ((String) -> Swift.Void)? = nil) {

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

        let CancelAction = UIAlertAction(title: cancel, style: .default) { action in
            if completion != nil {
                completion!("Cancel")
            }
        }
        let OKAction = UIAlertAction(title: ok, style: .default) { action in
            if completion != nil {
                completion!("OK")
            }
        }

        alertController.addAction(CancelAction)
        alertController.addAction(OKAction)
        viewcontroller.present(alertController, animated: true, completion: nil)
    }
}