performSelector with more than 2 objects

Question

Is there a way to call [anObject performSelector]; with more than 2 objects? I know you can use an array to pass multiple arguments, but I was wondering if there was a lowe

Answer 1

You can extend the NSObject class like this:

- (id) performSelector: (SEL) selector withObject: (id) p1
       withObject: (id) p2 withObject: (id) p3
{
    NSMethodSignature *sig = [self methodSignatureForSelector:selector];
    if (!sig)
        return nil;

    NSInvocation* invo = [NSInvocation invocationWithMethodSignature:sig];
    [invo setTarget:self];
    [invo setSelector:selector];
    [invo setArgument:&p1 atIndex:2];
    [invo setArgument:&p2 atIndex:3];
    [invo setArgument:&p3 atIndex:4];
    [invo invoke];
    if (sig.methodReturnLength) {
        id anObject;
        [invo getReturnValue:&anObject];
        return anObject;
    }
    return nil;
}

(See NSObjectAdditions from the Three20 project.) Then you could even extend the above method to use varargs and nil-terminated array of arguments, but that’s overkill.