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

　　XCode4.2 ? ?finder中找到 ??/Users/apple/Library/Developer/Xcode ? ?（注：Library資源庫是隱藏的文件夾）

　　里面有DerivedData和Snapshots兩個文件夾，刪除里面文件即可

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

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或者 ?File->project settings ?

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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.)

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

轉載于:https://www.cnblogs.com/zhepama/p/3330453.html

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