Scrolling in UICollectionView selects wrongs cells - Swift

Question

I have the following UICollectionView which is populated by an Array with NSManagedObject of type Categories

The

Answer 1

You don't want to call cellForItemAtIndexPath and configure the cells in the didSelectItemAtIndexPath or didDeselectItemAtIndexPath delegate methods. Also, you shouldn't be calling selectItemAtIndexPath and deselectItemAtIndexPath from within the cellForItemAtIndexPath method.

Instead, just keep track and toggle the state of the selected category in your select/deselect callbacks, and then don't do anything other the set up up the look of your cells in cellForItemAtIndexPath.

As the commenter pointed out, the cells are re-used, so stick to the simple way the delegate callbacks are designed to be used, and you should have much better luck.

If you need to refresh the look of the cells, do it by relying on cellForItemAtIndexPath being called while scrolling and using the reloadData and reloadItemsAtIndexPaths collection view methods if you need to force an update.