MAC OS 执行
$ gem install cocoapods
提示： RROR: While executing gem ... (Gem::FilePermissionError) You don't have write permissions for the /Library/Ruby/Gems/2.6.0 directory.
Try 1 or 2
1 - $ gem install cocoapods
2 - $ sudo gem install cocoapods
如果仍然不行
Try
export GEM_HOME="$HOME/.gem"
And try again:
gem install cocoapods
