I have two projects which the RestKit framework.
One project works without problems but another project fails, as soon as the RestKit framework is used.
I found out that the failing code is this:
return [anNSString MD5];
The MD5
method is a category method and is imported like this:
#import "NSString+MD5.h"
However, in one project, I keep getting the following error:
-[__NSCFString MD5]: unrecognized selector sent to instance 0x88a3390
I understand the basics of categories, and that they can be loaded at runtime, but I don't see why the category does not get loaded in this case.
These are the files on github: NSString+MD5.m, NSString+MD5.h,
Make sure you have the -ObjC flag enabled. Or it will not link categories in a static library.
Objective-C categories in static library
It's not enough to just include the header file. You also need to compile and link the .m
file in your project.
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