關於更新cocopods

相關的命令

• 更新gem: sudo gem update --system
• 刪除gem源: gem sources --remove https://ruby.taobao.org/
• 更換gem源: gem sources -a https://gems.ruby-china.org
• 查看gem源: gem sources -l
• 升級cocoapods: sudo gem install -n /usr/local/bin cocoapods --pre
• 查看升級後的版本: pod --version