清除XCode缓存和生成文件

1.Command-Option-Shift-K to clean out the build folder

  XCode4.2    finder中找到   /Users/apple/Library/Developer/Xcode    (注:Library资源库是隐藏的文件夹)

  里面有DerivedData和Snapshots两个文件夹,删除里面文件即可

  Remove all its contents because there's a bug where Xcode will run an old version of your project that's in there   somewhere.

或者  File->project settings

2.(Xcode 4.2 will show you the Derived Data folder: choose Window > Organizer and switch to the Projects tab. Click the right-arrow to the right of the Derived Data folder name.)

In the simulator, choose iOS Simulator > Reset Content and Settings.

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