UIAlertControl swift

let alertController = UIAlertController(title: "开始!", message: "游戏就要开始，你准备好了吗？", preferredStyle: UIAlertControllerStyle.Alert)
alertController.addAction(UIAlertAction(title: "Ready Go", style: UIAlertActionStyle.Default, handler: nil))
self.presentViewController(alertController, animated: true, completion: nil)