完全卸载Xcode

根目录下的必须要用管理员权限： 

sudo rm -rf /Applications/Xcode.app

sudo rm -rf /Library/Preferences/com.apple.dt.Xcode.plist

然后删除自己目录下的： 

rm -rf ~/Library/Preferences/com.apple.dt.Xcode.plist

rm -rf ~/Library/Caches/com.apple.dt.Xcode

rm -rf ~/Library/Application\ Support/Xcode

以及和开发者相关的： 

rm -rf ~/Library/Developer/Xcode

rm -rf ~/Library/Developer/CoreSimulator

rm -rf ~/Library/Developer/XCPGDevices

references： 

http://qiita.com/vc7/items/3d4b09d305509a85268f