解决Mac系统升级导致cocoapods失效问题

使用pod install出现如下错误

-bash: /usr/local/bin/pod: /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby: bad interpreter: No such file or directory
这是Mac升级系统导致，当你的Mac系统升级为 high siera的时候，别忘记更新cocoapods。

解决办法

1.先执行下面两行代码：

 1.sudo gem sources -r https://rubygems.org
 2.sudo gem sources -a http://rubygems.org 

2.执行过程如下：

1 boai:~ boai$ sudo gem sources -r https://rubygems.org
2 source https://rubygems.org not present in cache
3 boai:~ boai$ sudo gem sources -a http://rubygems.org
4 https://rubygems.org is recommended for security over http://rubygems.org
5 
6 Do you want to add this insecure source? [yn]  y

最后会提示

Do you want to add this insecure source? [yn]
你选择 y就行了
然后出现：

http://rubygems.org added to sources

这就说明成功了