Obj-C introspection: How can a method reference its own selector?

问题

I wish to write a macro, to be used within any method, which references the method's selector. I do not wish to pass the literal name of the method. For example:

#define RERUN [self performSelector:{something} withObject:nil afterDelay: 0.0]

where the "{something}" in the above would resolve to the selector of whatever method the macro was used in.

Is there some way to do this?

回答1:

_cmd represents the selector of the current method -- it is a hidden argument (like self).

if you never need arguments, or nil is suitable for your purpose - all you need to do is write:

#define RERUN [self performSelector:_cmd]

回答2:

Methods get an implicit argument _cmd, which is the selector.

来源：https://stackoverflow.com/questions/8431498/obj-c-introspection-how-can-a-method-reference-its-own-selector