转载自: http://stackoverflow.com/questions/25951998/error-system-file-has-been-modified-since-precompiled-header-was-built
Quit Xcode and remove everything in the module cache located here:
~/Library/Developer/Xcode/DerivedData/ModuleCache
The cache that was built with a previous version of Xcode is invalid for this version of Xcode and SDK, and that is causing your error.
本文介绍了解决Xcode中出现的预编译头文件错误的方法:通过删除无效缓存来修复由不同Xcode版本导致的问题。
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