Can't use for-in loop in function

Question

I'm not sure why this for-in loop isn't working. I'm using a slider that calls valueChanged: whenever it moves. To simplify the code I cleaned up all my stuff, but I just want to know why this doesn't work:

- (void)valueChanged:(CCControlSlider *)sender{
        for(CCControlSlider *slider in self.arrayOfSliders){
            NSLog(@"do something");
        }
}

It crashes with EXC_BAD_ACCESS. Am I doing something illegal here? Thanks

** EDIT: The issue: self.arrayOfSliders was set to (nonatomic, assign), so it wasn't being retained.

I've set my project to ARC (I'm more used to it!), problem should be solved. Thank you!

Try to use this "simplified" code instead of yours, will it work ? — A-Live, Apr 11 '13 at 22:34
Can you show us the code that creates `self.arrayOfSliders`? My guess is that you never retained it, and therefore it gets released before you access it in the above code. — dqhendricks, Apr 11 '13 at 22:45
EXC_BAD_ACCESS looks like memory problem to me, ARC enabled? — Bryan Chen, Apr 11 '13 at 22:48
Do you see any of the log statements? Is this `valueChanged:` even called? — rmaddy, Apr 11 '13 at 22:48

score 0 · Accepted Answer · edited May 23 '17 at 11:43

0

What debugging have you done? Is self.arrayOfSliders a valid object that hasn't been released?

Checking that a pointer is returned isn't enough. Try turning on NSZombie to see if the object has been deallocated.

edited May 23 '17 at 11:43

Community

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answered Apr 11 '13 at 22:40

Wain

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Not really an answer, @Wain. Questions go in the Comments section. This could be couched as an answer, though; for example, you could give advice on what debugging the OP should do. – matt Apr 11 '13 at 22:46
I'm afraid I can't comment yet, not enough reps. But when I can, I will. Thanks – Wain Apr 11 '13 at 22:51

Can't use for-in loop in function

1 Answers1