1.升級gem

sudo gem update --system

2.更新Ruby

sudo gem update -n /usr/local/bin --system

3.更新Ruby源

2.1 查看已有源(默認: https://rubygems.org/)

gem sources -l

3.2 移除原有源

gem sources --remove https://rubygems.org/

3.3 添加可用源

gem source -a https://gems.ruby-china.org/

如果出現 ERROR: SSL ... 錯誤則使用

gem source -a http://gems.ruby-china.org/

4.下載安裝cocoapods

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

pod  setup