error: /usr/include/objc/objc-class.h: No such file or directory

Question

I am currently using blocks in my UIButton category. However I have come across this error which I cannot solve:

error: /usr/include/objc/objc-class.h: No such file or directory

This is the line of code that uses blocks:

FTButtonBlock block = objc_getAssociatedObject(self, "buttonBlock");

Answer 1

Change

#import <objc/objc-class.h>

to

#import <objc/runtime.h>

From the blog entry: error: objc/objc-class.h: No such file or directory

Answer 2

Replace current line with following line:

#import <objc/runtime.h>

Thanks.