Swift 3 - QuickAlert for UIViewController

extension UIViewController {
    
    func showAlert(message: String) {
        let alert = UIAlertController(title: "Message", message:message, preferredStyle: UIAlertControllerStyle.alert)
        alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.default, handler:{ (ACTION :UIAlertAction!)in
            debugPrint("User click Ok button")
        }))
        self.present(alert, animated: true, completion: nil)
    }
}