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fatal error: module file '/Users/cylm/Library/Developer/Xcode/DerivedData/ModuleCache/35BFEUGU7C7G3/UIKit-2YJGPC5YLDB6L.pcm' is out of date and needs to be rebuilt
解决方法:【前往】-->【前往文件夹】--> 输入/Users/cylm/Library/Developer/Xcode/DerivedData/ModuleCache/35BFEUGU7C7G3/UIKit-2YJGPC5YLDB6L.pcm -->删除UIKit-2YJGPC5YLDB6L.pcm文件。在cmd+shift+k clean 一下就可以了