iOS can I increment an NSNumber, or do I need to create a new one?

Question

Is there a way to increment a NSNumber instance in place without having to create a new number ?

Here's what I'm doing currently:

    int photoIndex = hour + minute/30;
    NSNumber* currentCount =  [self.photosByTime objectAtIndex:photoIndex];

    [self.photosByTime replaceObjectAtIndex:photoIndex withObject:[NSNumber numberWithInt:currentCount.intValue +1]];

Is there a way to do the increment without having to replace the array contents every time?

Answer 1

您做对了，因为NSNUmber的内容不是可变的，因此每次更改都必须有一个新的内容。