升級10.10 Yosemite 後，cocoapods 出現錯誤解決方案

原文：  http://www.cnblogs.com/sparks/p/3989044.html

RSMacBook-Pro:~ RS$ pod search jsonkit
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require': cannot load such file -- xcodeproj/prebuilt/universal.x86_64-darwin14-2.0.0/xcodeproj_ext (LoadError)
  from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
  from /Library/Ruby/Gems/2.0.0/gems/xcodeproj-0.17.0/lib/xcodeproj/ext.rb:6:in `rescue in <top (required)>'
  from /Library/Ruby/Gems/2.0.0/gems/xcodeproj-0.17.0/lib/xcodeproj/ext.rb:3:in `<top (required)>'
  from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
  from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
  from /Library/Ruby/Gems/2.0.0/gems/xcodeproj-0.17.0/lib/xcodeproj.rb:30:in `<top (required)>'
  from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
  from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
  from /Library/Ruby/Gems/2.0.0/gems/cocoapods-0.33.1/lib/cocoapods.rb:2:in `<top (required)>'
  from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
  from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
  from /Library/Ruby/Gems/2.0.0/gems/cocoapods-0.33.1/bin/pod:32:in `<top (required)>'
  from /usr/bin/pod:23:in `load'
  from /usr/bin/pod:23:in `<main>'

方案一：(適用於大多數人)

Open Xcode 6 打開Xcode 6 —— 系統偏好設置 —— 位置 —— 把命令行工具改爲Xcode 6.0

卸載 cocoapods —— 重新安裝 xcodeproj —— 重新安裝 cocoapods

$ sudo gem uninstall cocoapods

$ sudo gem install xcodeproj

$ sudo gem install cocoapods 如果沒有問題，運行pod --version 查看安裝是否成功 

如果，不幸的是，上述操作無法解決，就要和樓主一樣了

方案二：

1.更新rbenv

$ curl -L get.rvm.io | bash -s stable

2.重新安裝ruby

$ rvm install ruby 2.1.1

3.重新安裝cocoapods

$ sudo gem install cocoapods