         }
         return cell
     }
-    
-    //
-    // UICollectionViewDelegateFlowLayout
-    //
-    //func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: /UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
-    //    return CGSize(width: self.size, height: self.size)
-    //}
-    //func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
-    //    return UIEdgeInsets(top: 20, left: 20, bottom: 20, right: 20)
-    //}
+
     //
     // UICollectionViewDelegate
     //

    }
    
    private let book: Book
    
    init(book: Book) {
        self.book = book

        let frame = CGRect(x: 0.0, y: 0.0, width: ChapterNumCell.SIZE, height: ChapterNumCell.SIZE)
        self.label = UILabel(frame: frame)
        self.label.textAlignment = .center
        self.label.layer.cornerRadius = ChapterNumCell.SIZE / 2
        self.label.layer.borderWidth = 2.0
        self.label.layer.borderColor = UIColor.init(white: 0.8, alpha: 1.0).cgColor
