一键清理系统垃圾文件，清除所有多余的启动项目，查看进程使用的端口-A key to clean common system junk files, remove all unnecessary startup items, view the process using the port

You use an AVPlayer object to implement controllers and user interfaces for single- or multiple-item playback. The multiple-item case supports advanced behaviors. AVPlayer works equally well with local and remote media files, providing you with

简单的画图功能,保存下来划过的路径，可以撤销上一步和移除所有操作-Simple drawing functions, preserved across the path, you can undo the step and remove all operations

实现tabelview的侧滑删除，侧滑时会出现更多和删除2个按钮-Tabelview realize the sideslip removed, there will be more and remove the 2 button sideslip