cocoapod升级版本

原文 http://blog.****.net/sing_sing/article/details/49762359

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该方法好用

sudo gem install -n /usr/local/bin cocoa pods

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此方法我试着不好用

重新安装： 
sudo gem install cocoa pods

出错
ERROR: While executing gem ... (Errno::EPERM) 
Operation not permitted - /usr/bin/xcodeproj

解决办法，是要将gem的默认路径重新修改： 
$ mkdir -p $HOME/Software/ruby 
$ export GEM_HOME=$HOME/Software/ruby 
$ gem install cocoapods 
[...] 
1 gem installed 
$ export PATH=$PATH:$HOME/Software/ruby/bin

验证一下，安装成功： 
$ pod --version 
0.39.0