CocoaPods安裝

CocoaPods安裝，若是您此前已安裝，請跳過此步驟。
移除現有的Ruby默認源
gem sources --remove https://rubygems.org/
使用新源
gem sources -a https://ruby.taobao.org/
驗證新源替換是否成功
gem sources -l
安裝CocoaPods
sudo gem install cocoapods
至此爲止，整個CocoaPods就已安裝成功了。