问题描述：想重装CocoaPods，在终端运行gem install cocoapods命令，出现如下错误：
ERROR: While executing gem ... (Gem::FilePermissionError) You don't have write permissions into the /Library/Ruby/Gems/1.8 directory.
问题分析：可能是没有权限
问题解决：sudo gem install cocoapods
问题描述：想重装CocoaPods，在终端运行gem install cocoapods命令，出现如下错误：
ERROR: While executing gem ... (Gem::FilePermissionError) You don't have write permissions into the /Library/Ruby/Gems/1.8 directory.
问题分析：可能是没有权限
问题解决：sudo gem install cocoapods