无法在 UICollectionView 单元格中显示图像

如何解决无法在 UICollectionView 单元格中显示图像

我需要在集合视图单元格中显示图像，但是当我尝试这样做时，我得到了 10 个空单元格，我不知道我在哪里犯了错误

这是我的ViewController代码

class NewgalleryViewController: UIViewController {
var presenter: ViewToPresenterPhotoProtocol?
var builder: galleryRequestBuilder?

@IBOutlet var collectionView: UICollectionView!

let reuseIdentifier = "customCVCell"


@objc func refresh() {
    presenter?.refresh()
}

override func viewDidLoad() {
    super.viewDidLoad()
    self.setupPresenterIfNeed()
    presenter?.viewDidLoad()
    // Do any additional setup after loading the view.
}

func setupPresenterIfNeed() {
    self.collectionView.backgroundColor = UIColor.white
    if self.presenter == nil {
        let presenter = galleryPresenter()
        presenter.view = self
        self.presenter = presenter
        self.builder = galleryRequestBuilder()
    }
}
}

     extension NewgalleryViewController: UICollectionViewDelegate,UICollectionViewDataSource,UICollectionViewDelegateFlowLayout {

func collectionView(_ collectionView: UICollectionView,numberOfItemsInSection section: Int) -> Int {
    return self.presenter?.photos.count ?? 0
}

func collectionView(_ collectionView: UICollectionView,cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: reuseIdentifier,for: indexPath) as! PhotoCollectionViewCell
    
    KFImage.url(builder?.createImageUrl(name: (presenter?.photos[indexPath.item].name)!))
        .onSuccess { result in
            cell.imageView.image = result.image
        }
    
    return cell
}

func collectionView(_ collectionView: UICollectionView,layout collectionViewLayout: UICollectionViewLayout,sizeforItemAt indexPath: IndexPath) -> CGSize {
    return CGSize(width: 180,height: 128)
}

func collectionView(_ collectionView: UICollectionView,minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
    return 1.0
}

func collectionView(_ collectionView: UICollectionView,layout
                        collectionViewLayout: UICollectionViewLayout,minimumLinespacingForSectionAt section: Int) -> CGFloat {
    return 20.0
}
// MARK: - UICollectionViewDelegate protocol

private func collectionView(collectionView: UICollectionView,didSelectItemAtIndexPath indexPath: NSIndexPath) {
    // handle tap events
    print("You selected cell #\(indexPath.item)!")
}
}

extension NewgalleryViewController: PresenterToViewPhotoProtocol{
func onFetchPhotoSuccess() {
    self.collectionView.reloadData()
    self.collectionView!.collectionViewLayout.invalidateLayout()
    self.collectionView!.layoutSubviews()
    self.collectionView.refreshControl?.endRefreshing()
}

func onFetchPhotoFailure(error: String) {
    print("View receives the response from Presenter with error: \(error)")
    self.collectionView.refreshControl?.endRefreshing()
}


}

这是单元格的代码

class PhotoCollectionViewCell: UICollectionViewCell {

@IBOutlet weak var imageView: UIImageView!

override func awakeFromNib() {
    super.awakeFromNib()
    // Initialization code
}

}

我已经检查了我向其发出请求的链接，并且它有效。所以问题不在于链接。也许我应该在获取图像后重新加载项目？

解决方法

您应该在加载视图后设置您的 override func viewDidLoad() { super.viewDidLoad() // Add this lines collectionView.delegate = self collectionView.dataSource = self self.setupPresenterIfNeed() presenter?.viewDidLoad() } 委托和数据源：

t1_3