sudo gem install cocoapods 报 ERR

更新 cocoapods ，在终端执行命令 sudo gem install cocoapods 报错

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

    You don't have write permissions for the /usr/bin directory.

解决方法如下：

在终端执行命令  sudo gem install -n /usr/local/bin cocoapods

查看版本号：

在终端执行命令  pod --version