Invalid parameter not satisfying: indexPath || ignoreInvalidItems

Question

Created Nov ’19

Replies 2

Boosts 1

Views 2.7k

Participants 3

I'm converting my collection view to new iOS13 UICollectionViewDiffableDataSource... so I need to update cell information on demand.

Here is my code:

let snap = self.diffDataSouce.snapshot 
snap?.reloadItems(withIdentifiers: [itemToUpdate]) //reload cell info
self.diffDataSouce.apply(snap, animatingDifferences: true)

But I get

Invalid parameter not satisfying: indexPath || ignoreInvalidItems

...why? My current

snap

contains

itemToUpdate

and also my array of models...

I think it's because

snap.indexOfItemIdentifier(itemToUpdate)

returns not found (NSNotFound)...but that's should be impossible according data model.

Have you some hints?

Boost

Answer 1

Claude31 OP

Nov ’19

You do not tell how you build

diffDataSouce.

That could be the issue.

Without this info, I can just propose a complete example, for you to compare with what you did.

h ttps://wwdcbysundell.com/2019/diffable-data-sources-first-look/

0

Answer 2

leojportes OP

Oct ’21

Hi, did you manage to resolve this? I'm having the same problem in snapshot tests.

0