使用SDWebImage在tableview里面的collectionView中加载图像

Question

我想使用sdWebImage将图像显示到tableView单元格内的collectionView Cell内的图像。 CategogyRow.swift中的How to do it ? and where i should write the sdWebImage api ? ？ 我有3个不同的单元格，我将做同样的事情。

  

Link i reffered

代码：

ViewController.swift：

class ViewController: UIViewController {
    var categories = ["Action", "Drama", "Science Fiction", "Kids", "Horror"]
}

extension ViewController : UITableViewDelegate { }

extension ViewController : UITableViewDataSource {

    func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
        return categories[section]
    }

    func numberOfSections(in tableView: UITableView) -> Int {
        return categories.count
    }

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return 1
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "cell") as! CategoryRow
        return cell
    }

}

CategoryRow.swift

    class CategoryRow : UITableViewCell {
        @IBOutlet weak var collectionView: UICollectionView!
    }

    extension CategoryRow : UICollectionViewDataSource {

        func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
            return 12
        }

        func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
            let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "videoCell", for: indexPath) as! VideoCell
            cell.imageView.image.sd_setImage(with: URL(string: "url"), placeholderImage: UIImage(named: "placeholder.png"))`
            return cell
        }

    }

    extension CategoryRow : UICollectionViewDelegateFlowLayout {

        func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
            let itemsPerRow:CGFloat = 4
            let hardCodedPadding:CGFloat = 5
            let itemWidth = (collectionView.bounds.width / itemsPerRow) - hardCodedPadding
            let itemHeight = collectionView.bounds.height - (2 * hardCodedPadding)
            return CGSize(width: itemWidth, height: itemHeight)
        }

    }

VideoCell.swift

class VideoCell : UICollectionViewCell {

    @IBOutlet weak var imageView: UIImageView!
}