Deleting cells from UICollectionView via NSNotification

Question

I have a simple UICollectionView based app - one UICollectionView and a NSMutableArray based data model for simplicity.

I can delete cells with no problem via the di

Answer 1

I had the same issue. My app would crash when I tried to insert a cell into my UICollectionView after I had selected text in a UITextField which was placed inside a collectionViewCell. My fix was to resign the first responder before the insertion happened. Since I was using a NSFetchedResultsController to handle the updating I put this at the beginning of controllerWillChangeContent:

- (void)controllerWillChangeContent:(NSFetchedResultsController *)controller {
    [[UIApplication sharedApplication].keyWindow findAndResignFirstResponder];
    ...
}

I found findAndResignFirstResponder from this SO answer