Retrieve custom cells in didSelectItemAtIndexPath

When I tap Cell in CollectionView, I am trying to implement the process such as adding subView to Cell like the camera roll in the Twitter app.
That's why I wrote this.

-(CameraRollCell*)collectionView:(UICollectionView*)collectionViewcellForItemAtIndexPath:(NSIndexPath*)indexPath{
    CameraRollCell* cell= [collectionView requestReusableCellWithReuseIdentifier: cellID forIndexPath:indexPath];
    return cell;
}

- (void) collectionView: (UICollectionView*) collectionView didSelectItemAtIndexPath: (NSIndexPath*)indexPath{
    CameraRollCell*cell= [collectionView cellForItemAtIndexPath:indexPath];
    cell selectPhoto;
}

US>Preparing a custom class inherited from the UICollectionViewCell` and retrieving the cell when tapped.After retrieval, you are invoking a method to add the subView that the custom cell has.

However, cellForItemAtIndexPath: will probably not be able to retrieve custom class Cells, so it will play...

So I have a question.

I look forward to hearing from you.

Supplemental
- I do not use StoryBoard.Code-only implementation.