安装或者更换cocoapods版本出现的问题

因为我要低版本的pod，所以卸载掉最新版的pod，重新安装低版本的。不会降低pod版本的朋友可以参考https://www.meetrue.com/archives/133

言归正传，在降低pod版本之后时候，用sudo gem install cocoapods -v 0.37.2出现问题

192:electricityshop XXXXX$ sudo gem install cocoapods -v 0.37.2

Password:

ERROR:  While executing gem ... (Errno::EPERM)

    Operation not permitted - /usr/bin/xcodeproj

这个问题貌似比较少见，我上次降低也未曾出现，这时候要制定路径给它像这样

 XXXX$ sudo gem install -n /usr/local/bin cocoapods -v 0.37.2

Successfully installed xcodeproj-0.24.3

Fetching: cocoapods-core-0.37.2.gem (100%)

Successfully installed cocoapods-core-0.37.2

Fetching: claide-0.8.2.gem (100%)

Successfully installed claide-0.8.2

Fetching: cocoapods-0.37.2.gem (100%)

Successfully installed cocoapods-0.37.2

Parsing documentation for xcodeproj-0.24.3

Installing ri documentation for xcodeproj-0.24.3

Parsing documentation for cocoapods-core-0.37.2

Installing ri documentation for cocoapods-core-0.37.2

Parsing documentation for claide-0.8.2

Installing ri documentation for claide-0.8.2

Parsing documentation for cocoapods-0.37.2

Installing ri documentation for cocoapods-0.37.2

4 gems installed

看起来不错，检查一下

$ which pod

/usr/local/bin/pod

完美！