remindUpdateView 利用swift的协议写的提示更新的拓展 简书地址 http://www.jianshu.com/p/4c64bc4f5ee8 样子 http://upload-images.jianshu.io/upload_images/1329661-4987821fc5b952d7.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240