Error installing pods:activesupport requires Ruby version >=2.2.2

https://github.com/CocoaPods/CocoaPods/issues/4711


sudo gem install activesupport -v 4.2.6
sudo gem install cocoapods


能解决, 希望能帮到后面的人 


http://www.cocoachina.com/bbs/read.php?tid-1686950.html




以下是更新Ruby
http://blog.youkuaiyun.com/fairytale_1/article/details/51850734