安装需要用到Ruby，虽然Mac自带了Ruby，不过版本有点老了，最好更新一下
sudo gem update --system
因为Ruby的软件源rubygems.org被屏蔽了，所以要更换源
gem sources --add https://gems.ruby-china.com/ --remove https://rubygems.org/
接下来查看下源路径是否更换了
gem sources -l
CocoaPods安装
sudo gem install -n /usr/local/bin cocoapods
输入 pod --verson 查看cocoapods当前的版本
克隆库到本地
git clone https://gitee.com/cjsliuj/CocoaPodsSpecsMirror.git ~/.cocoapods/repos/master --progress
最后再执行pod setup
CocoaPods 1.7.0.beta.3 is available.
To update use: `sudo gem install cocoapods --pre`
[!] This is a test version we'd love you to try.
