List selectors for Objective-C object

Question

I have an object, and I want to list all the selectors to which it responds. It feels like this should be perfectly possible, but I'm having trouble finding the APIs.

Answer 1

This is a solution based on the runtime C functions:

class_copyMethodList returns a list of class methods given a Class object obtainable from an object.

#import <objc/runtime.h> 

[..]

SomeClass * t = [[SomeClass alloc] init];  int i=0; unsigned int mc = 0; Method * mlist = class_copyMethodList(object_getClass(t), &mc); NSLog(@"%d methods", mc); for(i=0;i<mc;i++)     NSLog(@"Method no #%d: %s", i, sel_getName(method_getName(mlist[i])));  /* note mlist needs to be freed */ 

Answer 2

I think usually you'll want to do that in the console, instead of cluttering your code with debug code. This is how you can do that while debugging in lldb:

(Assuming an object t)

p int $num = 0; expr Method *$m = (Method *)class_copyMethodList((Class)object_getClass(t), &$num); expr for(int i=0;i<$num;i++) { (void)NSLog(@"%s",(char *)sel_getName((SEL)method_getName($m[i]))); }