Swift 2.0 UIAlertController

    //使用方式
    showAlert("哈囉！");


    //顯示alert
    func showAlert(iMsg: String) {
        
        let alertController = UIAlertController(title: "訊息", message:
            iMsg, preferredStyle: UIAlertControllerStyle.Alert)
        alertController.addAction(UIAlertAction(title: "關閉", style: UIAlertActionStyle.Default,handler: nil))
        
        self.presentViewController(alertController, animated: true, completion: nil)
        
    }