gem install cocoapods ERROR: While executing gem ... (Gem::FilePermissionError)

在cocoapods 执行

 sudo gem install cocoapods

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

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

 

如果是卸载的话，把上面这句改成：

sudo gem uninstall -n /usr/local/bin cocoapods  即可