UICollectionView Assertion failure in deleteItemsAtIndexPaths

Question

Here is my error:

*** Assertion failure in -[PSUICollectionView _endItemAnimations], /SourceCache/UIKit_Sim/UIKit-2372/UICollectionView.m:2801

I'm calling it like this:

[self.collectionView deleteItemsAtIndexPaths:@[[NSIndexPath indexPathForItem:1 inSection:1]]];

Why is this happening, any ideas?

Answer 1

Do you remove the item from your model as well? So, for example, if the number of rows, sections and the content they present is taken from a dictionary of arrays whose keys represent the sections and each array the rows, then if you delete one row with deleteItemsAtIndexPaths you're responsible to update the dictionary accordingly. UICollectionView will not do it for you.