安装cocoapods

如果你网络可以的话直接终端运行以下命令

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

网络不行则切换gem的源

//查看源
gem source -l

//打印
*** CURRENT SOURCES ***
https://rubygems.org

//如果不是是https://ruby.taobao.org/
gem sources --remove https://rubygems.org/
//添加源
gem sources -a https://ruby.taobao.org/

//查看源是否切换成 https://ruby.taobao.org/
gem source -l 

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

更新完成后在工程目录下执行

pod install