安装pod

1.ruby升级最新

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

2.

$ gem sources

*** CURRENT SOURCES ***

https://rubygems.org/

3.移除
gem sources --remove https://rubygems.org/
4.添加
gem

sources --remove https://taobao.org/

5.查看gem sources

6.gem install cocoapods