class_addMethod

Return Value 戻り値

YES if the method was added successfully, otherwise NO (for example, the class already contains a method implementation with that name).

Discussion 解説

class_addMethod will add an override of a superclass's implementation, but will not replace an existing implementation in this class. To change an existing implementation, use method_setImplementation.

An Objective-C method is simply a C function that take at least two arguments—self and _cmd. For example, given the following function:

void myMethodIMP(id self, SEL _cmd)
{
    // implementation ....
}

you can dynamically add it to a class as a method (called resolveThisMethodDynamically) like this:

class_addMethod([self class], @selector(resolveThisMethodDynamically), (IMP) myMethodIMP, "v@:");