1.如果之前已经安装过的
gem list --local | grep cocoapods
会看到如下输出：
cocoapods (1.1.1)
cocoapods-deintegrate (1.0.1)
cocoapods-downloader (1.1.3)
cocoapods-plugins (1.0.0)
cocoapods-search (1.0.0)
cocoapods-stats (1.0.0)
cocoapods-trunk (1.1.2)
可以一个一个卸载
sudo gem uninstall cocoapod sudo gem uninstall cocoapod-deintegrate sudo gem uninstall cocoapod-downloader sudo gem uninstall cocoapod-plugins sudo gem uninstall cocoapod-search sudo gem uninstall cocoapod-stats
sudo gem uninstall cocoapod-trunk
在把pod的安装目录移除
which pod sudo rm -rf <path>
2.安装前先设置一下镜像
gem sources -l
// 移除原来的
gem source -r https://rubygems.org/
// 添加taobao镜像
gem source -a https://ruby.taobao.org
3.安装，可以指定版本，就可以安装默认
// 这两个命令都得等一短时间
sudo gem install cocoapods
pod setup
原文：http://www.cnblogs.com/shuigu/p/6217391.html