NSInteger and NSUInteger in a mixed 64bit / 32bit environment

Question

I have a fair amount of string format specifiers in NSLog / NSAssert etc. calls which use %d and %u with NSInteger (= int on 32bit) an

Answer 1

No, (unfortunately) there is no printf format that directly corresponds to NS(U)Integer. So for architecture independent code, you have to convert everything to the "long" variant (as the Xcode "Fix-it" suggests):

NSInteger i = ...;
NSLog(@"%ld", (long)i);

The only alternative that I know of is from Foundation types when compiling for arm64 and 32-bit architecture:

// In the precompiled header file:
#if __LP64__
#define NSI "ld"
#define NSU "lu"
#else
#define NSI "d"
#define NSU "u"
#endif

NSInteger i = ...;
NSLog(@"i=%"NSI, i);

using preprocessor macros (but even the author of that answer calls it a "admittedly awful approach").