1.检查当前安装版本列表.
gem list --local | grep cocoapods
2.卸载不用版本.
sudo gem uninstall cocoapods 1.5.3
3.安装指定版本.
sudo gem install cocoapods -v 1.6.1
或
sudo gem install -n /usr/local/bin cocoapods -v 1.6.1(如果上边不成功,可以试试这个)
来源:oschina
链接:https://my.oschina.net/wenchengxu123/blog/3197274