OS X 10.11 安装Cocoapods

sudo gem install cocoapods报如下错误：

ERROR: While executing gem ... (Errno::EPERM)
Operation not permitted - /usr/bin/xcodeproj

解决的办法是：sudo gem install -n /usr/local/bin cocoapods

gem影像改成：https://ruby.taobao.org/

gem sources -l 列出服务器地址

gem sources --remove 列出的服务器地址

gem sources -a  https://ruby.taobao.org/