func collectionView(_ collectionView: UICollectionView, editActionsForItemAt indexPath: IndexPath, for orientation: SwipeActionsOrientation) -> [SwipeAction]? {
        guard orientation == .left else { return nil }
        let item = fetchedResultsController.object(at: indexPath)
        let unreadAction = SwipeAction(style: .default, title: item.isUnread ? "Read" : "Unread") { action, indexPath in
            item.isUnread = !item.isUnread
        }
        unreadAction.backgroundColor = .clear
        unreadAction.textColor = .bookmark01
        unreadAction.image = item.isUnread ? UIImage(named: "read") : UIImage(named: "unread")
        return [unreadAction]
    }
    
    func collectionView(_ collectionView: UICollectionView, editActionsOptionsForItemAt indexPath: IndexPath, for orientation: SwipeActionsOrientation) -> SwipeOptions {
        var options = SwipeOptions()
        options.expansionStyle = .selection
        options.transitionStyle = .border
        options.backgroundColor = .clear
        return options
    }