Swift下弹出对话框

//对话框控制器
            let alertController = UIAlertController(title: "提示",message: "数字不能为空",preferredStyle: UIAlertControllerStyle.Alert)
            //点击按钮动作
            let canCelAction = UIAlertAction(title: "取消",style: UIAlertActionStyle.Cancel,handler: { (UIAlertAction) -> Void in print("取消操作") }) let okAction = UIAlertAction(title: "确定",style: UIAlertActionStyle.Default,handler:nil) alertController.addAction(canCelAction) alertController.addAction(okAction) self.presentViewController(alertController,animated:true,completion:nil)