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

最近升级 cocoapods 遇到的问题，先是 gem install cocoapods 报错：

ERROR:  While executing gem ... (Gem::FilePermissionError)
    You don't have write permissions for the /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/gems/2.6.0 directory.

你说没权限，那我就加上超级权限：

sudo gem install cocoapods

还是报错

ERROR:  While executing gem ... (Gem::FilePermissionError)
    You don't have write permissions for the /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/gems/2.6.0 directory.

然后我又换了一个命令：

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

还是报那个错误。

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最终找到一个一发入魂的命令：

gem install cocoapods --user-install

成功！

注：如遇网络不给力，可尝试使用手机热点。