thenopen

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")
            }