Question

NSNumber Leaking memory inside a for loop – started occurring at Xcode Instruments version 4.1 on OSX Lion – this is leaking when executed on device profile with instruments. Any ideas appreciated.

        int currentActivityScore = [self.activityScore intValue];
        int deltaCriteriaScore = [[segmentItemArray objectAtIndex:3] intValue];
        int newActivityScore = currentActivityScore + deltaCriteriaScore;
        self.activityScore = [NSNumber numberWithInt:newActivityScore];

i tried this code too, still getting a leak!!!

        int currentActivityScore = [self.activityScore intValue];
        int deltaCriteriaScore = [[segmentItemArray objectAtIndex:3] intValue];
        int newActivityScore = currentActivityScore + deltaCriteriaScore;
        NSNumber *newActivityScoreNumber = [[NSNumber alloc] initWithInt:newActivityScore];
        self.activityScore = newActivityScoreNumber;
        [newActivityScoreNumber release];

Answer 1

Assuming that activityScore either retains or copies its values, then I think your code is okay.

It’s not unheard of for Instruments to give false-positives (or miss genuine leaks). Consider it a pointer to code to double-check rather than a guarantee of a leak.