Reason: This is actually the logic of using pch files in Xcode compilation, after introducing c files in the project, pch will mix #include and #import, in order to reduce compiler workload, you need to use precompiled macros to make a slight distinction.
Solution: Check all pch files in the project and put “#import xxx”, which is only used in OC, in “#indef __OBJC__” and “#endif”
#ifndef PrefixHeader_pch
#define PrefixHeader_pch
#ifdef __OBJC__
#import "Masonry.h"
#endif
#endif /* PrefixHeader_pch */
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