PCH 以及log

     $(SRCROOT)/PCHFile/Project-Prefix.pch

#ifdef DEBUG

#define NSLog(FORMAT, ...) fprintf(stderr,"%s:%d %s ",[[[NSString stringWithUTF8String:__FILE__] lastPathComponent] UTF8String], __LINE__, [[NSString stringWithFormat:FORMAT, ##__VA_ARGS__] UTF8String]);

#else

#define NSLog(...)

#endif