1.卸载老版本cocopods
$ sudo gem uninstall cocoapods
2.查看本地安装过的cocopods相关东西
$ gem list --local | grep cocoapods
显示如下:
cocoapods (1.0.1)
cocoapods-core (1.0.1)
cocoapods-deintegrate (1.0.1)
cocoapods-downloader (1.1.1)
cocoapods-plugins (1.0.0)
cocoapods-search (1.0.0)
cocoapods-stats (1.0.0)
cocoapods-trunk (1.0.0)
cocoapods-try (1.1.0)
然后使用命令逐个删除
$ sudo gem uninstall cocoapods-core
$ sudo gem uninstall cocoapods-deintegrate
如果怕删不干净有残留的话可以找到 .cocopods 文件（隐藏文件）删掉就好
显示隐藏文件：defaults write com.apple.finder AppleShowAllFiles -bool true
killall Finder
隐藏文件：defaults write com.apple.finder AppleShowAllFiles -bool false
killall Finder
