UICollectionView crash when deleting last item

Question

I am trying to update the uicollection view whenever I delete a item. All the cells are deleting fine but if I delete the last cell in that collection view App crashes and I have put

[self.collectionview performBatchUpdates:^{
        [postarray removeObjectAtIndex:indexPath.item];
        [self.collectionview deleteItemsAtIndexPaths:@[[NSIndexPath indexPathForRow:indexPath.row inSection:1]]];
    } completion:^(BOOL finished) {}];

The error I got is 'NSRangeException', reason: '* -[__NSArrayI objectAtIndex:]: index 17 beyond bounds [0 .. 16]' . Even array and collection view item starts at same index,I got this message

score 1 · Answer 1 · edited May 23 '17 at 12:01

1

I was getting the same error message with the same lines of code, and it turned out it had nothing to do with the UICollectionView data source, but with a parallel array in another part of the app that updated its contents after but not its active index after the delete.

To find errors like this, enable Exception breakpoints: NSRangeException when deleting last UICollectionViewCell

edited May 23 '17 at 12:01

Community

1
1

answered Mar 26 '16 at 23:58

Cbas

6,003
11
56
87

score 0 · Answer 2 · answered Jun 04 '14 at 16:00

0

Just inverse your two lines. You need to remove cell before to remove your object.

[self.collectionview performBatchUpdates:^{
        [self.collectionview deleteItemsAtIndexPaths:@[[NSIndexPath indexPathForRow:indexPath.row inSection:1]]];
        [postarray removeObjectAtIndex:indexPath.item];
    } completion:^(BOOL finished) {}];

answered Jun 04 '14 at 16:00

Plokstorm

44
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Thanks.but still crash occurs after inverse two lines – user2960625 Jun 05 '14 at 07:27
Is it the same error message ? Replace : [postarray removeObjectAtIndex:indexPath.item]; By : [postarray removeObjectAtIndex:indexPath.row]; – Plokstorm Jun 05 '14 at 13:27

UICollectionView crash when deleting last item

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