class_addMethod on iphone (objective-c)

Question

I'm trying to use the answer accepted here: Dynamic UIMenuItems with @selector and dynamic methods But it gives a warning (and it doesn't work) of: implicit declaration of function 'class_addMethod'

I have searched google but have no idea?

Answer 1

Add #include <objc/runtime.h> to the top of your implementation file (.m or .c).