升級10.10 Yosemite 後，cocoapods 出現錯誤(解決方案)

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>'

 一直想嘗試新系統，因爲擔憂bug會致使開發遇到一系列問題，一直忍住沒有升級，前兩天升級了，就馬上遇到這個問題。

沒法對cocoapods進行操做，stackoverflow上有個解決方案，被多人轉載，惋惜didn't work for me. 因而我試着從新安裝ruby，解決了

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 —— 把命令行工具改成Xcode 6.0

卸載 cocoapods —— 從新安裝 xcodeproj —— 從新安裝 cocoapods

$ sudo gem uninstall cocoapods

$ sudo gem install xcodeproj

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

若是，不幸的是，上述操做沒法解決，就要和樓主同樣了

1.更新rbenv        

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

2.從新安裝ruby

$ rvm install ruby 2.1.1

3.從新安裝cocoapods

$ sudo gem install cocoapods