object at index updates whole nsmutablearray

Question

I have an NSMutableArray with multiple products. Each product has an amount. I want to update the amount of the associated product when a stepper is clicked. But all my products (whole NSMutableArray) are updated with the amount of the stepper.

    NSInteger index = stepper.tag;

    Product *p = [products objectAtIndex:index];
    p.amount = [NSNumber numberWithDouble:stepper.value];
   //    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:[NSString stringWithFormat:@"%d", stepper.tag] message:@"test" delegate:nil cancelButtonTitle:@"ok"otherButtonTitles:nil];
   //    [alert show];

   for (Product *p in products) {
       UIAlertView *alert = [[UIAlertView alloc] initWithTitle:[NSString stringWithFormat:@"%@", p.amount] message:p.name delegate:nil cancelButtonTitle:@"ok"otherButtonTitles:nil];
       [alert show];
   }

Does anyone have a solution?

FlyCodeRepeat · Accepted Answer · 2013-09-11 14:22:59Z

1

Since Product *p is a pointer, you don't have to remove and re-insert in the array. You can just modify the Product in place. Try this:

NSInteger index = stepper.tag;

Product *p = [products objectAtIndex:index];
p.amount = [NSNumber numberWithDouble:stepper.value];

answered Sep 11, 2013 at 14:22

FlyCodeRepeat

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3 Comments

Stan Samyn Over a year ago

Thanks, but the result is still the same :s

Stan Samyn Over a year ago

I edited my question with whole code triggered when stepper is clicked.. (when I uncomment the one part, I see the right stepper.tag)

tdelepine Over a year ago

Are you sure that whole array was updated. Debug your code with an alertView is not the better way, because the show method was no stop on each element but stack it. Replace the alertView by NSLog and shown the result.

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