1、升級
sudo gem install cocoapods
若不成功，則先更新gem
sudo gem update --system
2、降級
先用gem list查看版本署海，然后卸載當(dāng)前版本
gem list
sudo gem uninstall -n /usr/local/bin cocoapods -v 1.10.1
執(zhí)行完上面命令后，再執(zhí)行gem list查看下,發(fā)現(xiàn)cocoapods-core(1.10.1)并沒有卸載干凈医男；如果依次執(zhí)行以下命令卸載砸狞，會比較干凈
sudo gem uninstall cocoapods
sudo gem uninstall cocoapods-core
sudo gem uninstall cocoapods-deintegrate
sudo gem uninstall cocoapods-downloader
sudo gem uninstall cocoapods-plugins
sudo gem uninstall cocoapods-search
sudo gem uninstall cocoapods-stats
sudo gem uninstall cocoapods-trunk
sudo gem uninstall cocoapods-try
最后安裝指定版本
sudo gem install -n /usr/local/bin cocoapods -v 1.8.3
