cocoapods not work on XCode 13
===

遇到 `pod init` 錯誤的問題，解決方式在 command line 分別下：

sudo gem uninstall -aIx
rm -rf ~/.gem
sudo gem install cocoapods

sudo chown -R $USER ~/Library/Caches/CocoaPods

sudo gem install -n /usr/local/bin cocoapods -v 1.8.4

## Ref.
[Could not find 'ffi' (>= 1.3.0) among 85 total gem(s) (Gem::MissingSpecError) React native IOS on pod install](https://stackoverflow.com/a/69098292/11827511)

[Trouble with installing cocoapods](https://developer.apple.com/forums/thread/668456)

###### tags: `系統環境`