         }
         cell.collectionView.delegate = self
         cell.collectionView.dataSource = self
+        cell.collectionView.tag = indexPath.row // TODO: replace tag to other variable
 
         return cell
     }

extension View.DataController: UICollectionViewDataSource, UICollectionViewDelegate {

    func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return 3
    }

    func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {

        }

        return cell
    }

    func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {

        if let view = view, let delegate = view.delegate {
            NSIndexPath(forItem: indexPath.item, inSection: collectionView.tag)
            delegate.shelfView(view, didSelectItemAtIndexPath: indexPath)
        }
    }

}
