安装Cocoapods

0.装备好梯子(翻墙,你懂的)

1.安装 brew
命令在 http://brew.sh/

$ /usr/bin/ruby -e "$(curl -fsSL [https://raw.githubusercontent.com/Homebrew/install/master/install)"](https://raw.githubusercontent.com/Homebrew/install/master/install)%22)

2.更新 ruby

$ brew install ruby
​```
3.使用 ruby 下载 Cocoapods

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

4.更新 pod 本地文档

$ pod setup (网速差的时间可能有点长,你懂的)

可能还要更新本地的根
下载好ruby后更新下即可

$ gem sources --remove https://rubygems.org/
$ gem sources -a https://ruby.taobao.org/
$ gem sources -l
$ sudo gem update --system