Getting makeObjectsPerformSelector to Work in Objective C

I am trying to use makeObjectsPerformSelector instead of using a loop and I can't quite get it to work. I have like 20 balls that I'm trying to add to the screen inside "init".

I can add a single one by making a sprite like this:

CCSprite *ball = [CCSprite spriteWithFile:@"ball.png" rect:CGRectMake(0, 0, 20, 20)];

        // set the position of the ball providing the coordinates
        ball.position = ccp((player.contentSize.width/2 + 400)+ball.contentSize.width/2, winSize.height/2 - ball.contentSize.height/2);

        // add the ball to the playing area
        [self addChild:ball];

This seems to work great but 开发者_开发问答now I need to add like 20 of them. So I've decided to use an array called "balls" and I've read that I can use makeObjectsPerformSelector to perform an action on each each object in the array, but I can't figure out how to add each ball, so far I have this:

- (void) makeObjectsPerformSelector:(SEL)aSelector
{

    // add the ball to the screen
    [self addChild:aSelector];

}

I think that I need to use the aSelector object on the balls array and add that right? Am I using this incorrectly?

Thank you!

Based on your example, it's rather hard to tell what you're trying to do. But if you have an NSArray called balls, and an operation you want to perform on each ball called bounce, you can use -makeObjectsPerformSelector::

[balls makeObjectsPerformSelector:@selector(bounce)];

Was that helpful at all?

A selector is not an object. It is a key which is used to look up an implementation in the method table. You should never need to override -makeObjectsPerformSelector: