cocoapods升级和降级

1、升级

sudo gem install cocoapods

若不成功，则先更新gem

sudo gem update --system

2、降级

先用gem list查看版本，然后卸载当前版本

gem list
sudo gem uninstall -n /usr/local/bin cocoapods -v 1.10.1

执行完上面命令后，再执行gem list查看下,发现cocoapods-core(1.10.1)并没有卸载干净；如果依次执行以下命令卸载，会比较干净

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

最后安装指定版本

sudo gem install -n /usr/local/bin cocoapods -v 1.8.3