升级到Xcode6使用不了以前的插件（VVDocumenter、KSImageNamed、Alcatraz）解决：
1)到Xcode安装插件的路径下: library/Application Support/Developer/Shared/Xcode/Plug-ins
2)右键点击插件，查看包内容，打开info.plist 文件，找到DVTPlugInCompatibilityUUIDs，点击+号添加： C4A681B0-4A26-480E-93EC-1218098B9AA0
3)保存文件，重启Xcode
No Need to repeat for all plugins that are already installed to Xcode 6.
或者使用命令行：find ~/Library/Application\ Support/Developer/Shared/Xcode/Plug-ins -name Info.plist -maxdepth 3 | xargs -I{} defaults write {} DVTPlugInCompatibilityUUIDs -array-add defaults read /Applications/Xcode.app/Contents/Info.plist DVTPlugInCompatibilityUUID
相关链接：http://joeshang.github.io/2015/04/10/fix-xcode-upgrade-plugin-invalid/
Xcode7
升级到Xcode7后又用不了了，上面的步骤也不管用，原因是是新的xCode的UUID没有在插件的配置文件中注册进去。在网上找了一位大神的使用命令行的解决方案，记录如下：
- 得到Xcode的UUID：
defaults read /Applications/Xcode.app/Contents/Info.plist DVTPlugInCompatibilityUUID
循环插入UUID:
find ~/Library/Application\ Support/Developer/Shared/Xcode/Plug-ins/ -name Info.plist -maxdepth 3| xargs -I{} defaults write {} DVTPlugInCompatibilityUUIDs -array-add '0420B86A-AA43-4792-9ED0-6FE0F2B16A13'重启Xcode，会跳出一个弹框，选择loadBoundle就·
