2.Xcode磁盘空间大清理
移除对旧设备的支持
路径：~/Library/Developer/Xcode/iOS DeviceSupport
移除旧版本的模拟器支持
路径：~/Library/Application Support/iPhone Simulator
移除模拟器的临时文件
路径：~/Library/Application Support/iPhone Simulator/6.1/tmp (以iOS Simulator 6.1为例)
移除模拟器中安装的Apps
路径：~/Library/Application Support/iPhone Simulator/6.1/Applications (以iOS Simulator 6.1为例)
移除Archives
路径：~/Library/Developer/Xcode/Archives
移除DerivedData
路径：~/Library/Developer/Xcode/DerivedData
移除旧的Docsets
路径：~/Library/Developer/Shared/Documentation/DocSets
3.xcode插件
4.Xcode的Debug中查看数据细节的方法
http://www.acwind.net/blog/archives/1229
