升级到mac 10.10之后使用pod出现问题的解决方法
最新对mac10.10的强大功能好奇，于是将系统升级到了10.10，结果发现使用pod出现了下面的问题：
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in`require':cannotloadsuchfile--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`rescuein<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>'
经过一番乱搜，具体的解决步骤如下:
1.打开Xcode6
2.进入Preferences
3.点击Locations选项
4.将CommandLineTools版本变成Xcode6.0
5.卸载cocoapods，在终端中输入
$sudogemuninstallcocoapods
6.安装xcodeproj，在终端中输入
$sudogeminstallxcodeproj
7.安装cocoapods，在终端中输入
$sudogeminstallcocoapods
8.测试pod是否安装成功，在终端中输入
$pod--version