CocoaPods使用 sudo gem install cocoapods 的时候出错

ERROR:  While executing gem ... (Errno::EPERM)
    Operation not permitted - /usr/bin/pod

执行下面的命令

sudo gem install -n /usr/local/bin cocoapods

sudo gem install cocoapods
如果报错

ERROR:  While executing gem ... (Gem::FilePermissionError)
    You don't have write permissions for the /usr/bin directory.

解决:

sudo gem install -n /usr/local/bin cocoapods