How can I dynamically create a selector at runtime with Objective-C?

Question

I know how to create a SEL at compile time using @selector(MyMethodName:) but what I want to do is create a selector dynamically from an NSSt

Answer 1

I'd have to say that it's a little more complicated than the previous respondents' answers might suggest... if you indeed really want to create a selector... not just "call one" that you "have laying around"...

You need to create a function pointer that will be called by your "new" method.. so for a method like [self theMethod:(id)methodArg];, you'd write...

void (^impBlock)(id,id) = ^(id _self, id methodArg) { 
     [_self doSomethingWith:methodArg]; 
};

and then you need to generate the IMP block dynamically, this time, passing, "self", the SEL, and any arguments...

void(*impFunct)(id, SEL, id) = (void*) imp_implementationWithBlock(impBlock);

and add it to your class, along with an accurate method signature for the whole sucker (in this case "v@:@", void return, object caller, object argument)

 class_addMethod(self.class, @selector(theMethod:), (IMP)impFunct, "v@:@");

You can see some good examples of this kind of runtime shenanigans, in one of my repos, here.