fetch images from link asynchronysly in Tableview or CollectionView (Without image show other cell)

func collectionView(_ collectionView: UICollectionView, willDisplay cell: UICollectionViewCell, forItemAt indexPath: IndexPath) {

        if collectionView == self.authorList {

            let imageUrl = authorArray[indexPath.row].image
            let cellNot = cell as! CollectionCellSlider

            if !imageUrl.isEmpty {
                cellNot.bookImg.loadImageUsingCache(withUrl: imageUrl)
                collectionView.layoutSubviews()
            }

        } else if collectionView == self.popularList {

            let imageUrl = booksArray[indexPath.row].image
            let cellNot = cell as! CollectionCellSlider

            if !imageUrl.isEmpty {
                cellNot.bookImg.loadImageUsingCache(withUrl: imageUrl)
                collectionView.layoutSubviews()
            }
        }  else if collectionView == self.editorBookList {

            let imageUrl = editorBooksArray[indexPath.row].image
            let cellNot = cell as! CollectionCellSlider

            if !imageUrl.isEmpty {
                cellNot.bookImg.loadImageUsingCache(withUrl: imageUrl)
                collectionView.layoutSubviews()
            }

        } else if collectionView == self.slider {

            let imageUrl = sliderList[indexPath.row].image
            let cellNot = cell as! CollectionCellSlider

            if !imageUrl.isEmpty {
                cellNot.bookImg.loadImageUsingCache(withUrl: imageUrl)
                collectionView.layoutSubviews()
            }

        }
    }