昨晚回家之后开始升级系统到10.11，下载了一整个晚上之后终于在早上下载完毕，早上带到公司，想查一个第三方库的时候却遇到了问题：
guoyufudeMacBook-Pro:~ GuoYufu$ pod search VKVideoPlayer
-bash: pod: command not found
接着尝试：
guoyufudeMacBook-Pro:~ GuoYufu$ gem sources -l
*** CURRENT SOURCES *** http://ruby.taobao.org/
这里没错。
guoyufudeMacBook-Pro:~ GuoYufu$ pod help
-bash: /usr/local/bin/pod: /usr/local/opt/ruby/bin/ruby: bad interpreter: No such file or directory
然后基本确定是系统升级之后导致CocoaPods不能正常使用。继续查找解决方案：
1.首先考虑重新安装CocoaPods：
guoyufudeMacBook-Pro:~ GuoYufu$ sudo gem install cocoapods
Password:
ERROR: While executing gem ... (Errno::EPERM)
Operation not permitted - /usr/bin/pod
失败。
2.继续根据报错信息查找解决方法，运行查到的：
sudo gem install -n /usr/local/bin cocoapods
提示：
Successfully installed cocoapods-0.38.2
Parsing documentation for cocoapods-0.38.2
1 gem installed
莫非成功了？
尝试：
pod search VKVideoPlayer
可以正常执行。
尝试更新一下CocoaPods的版本：
guoyufudeMacBook-Pro:~ GuoYufu$ sudo gem install cocoapods
Password:
ERROR: While executing gem ... (Errno::EPERM)
Operation not permitted - /usr/bin/pod
还是报错。
3.索性按照最初安装的步骤全部来一遍：
安装Homebrew
ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
安装Ruby后重新安装CocoaPods
brew install ruby
sudo gem install cocoapods
终于不再报错了。