UIAlertController

      

      let alertTitle = "TITLE"
            let alertMessage = "MESSAGE"

            let alertOkButtonText = "确定"

            let alterCancelButtonText = "取消"

            let alertController = UIAlertController(title: alertTitle, message: alertMessage, preferredStyle: .Alert)

           //添加的按钮 用UIAlertAction

            let actionOk = UIAlertAction(title: alertOkButtonText, style: .Default, handler: { (UIAlertAction) in   

               //to do something here

            })

            let actionCancel = UIAlertAction (title: alterCancelButtonText, style: .Default, handler: { (UIAlertAction) in

                self.dismissViewControllerAnimated(true, completion: nil)

            })
            alertController.addAction(actionOk)

            alertController.addAction(actionCancel)

            

            self.presentViewController(alertController, animated: true, completion: nil)