Hi, I'm trying to recreate an image gallery like the one on the "Photos" App of the iPhone. This is the code I'm using (Swift 5): import UIKit import Photos private let reuseIdentifier = "dataCell" class GalleryCollectionViewController: UICollectionViewController {     var images = [PHAsset]()     override func viewDidLoad() {         super.viewDidLoad()         self.collectionView!.register(GalleryImageCell.self, forCellWithReuseIdentifier: reuseIdentifier)         getImages()     }          func getImages() {         let assets = PHAsset.fetchAssets(with: PHAssetMediaType.image, options: nil)         assets.enumerateObjects({ (object, count, stop) in             self.images.append(object)         })                  self.images.reverse()         self.collectionView!.reloadData()     }          override func numberOfSections(in collectionView: UICollectionView) - Int {         return 1     }               override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) - Int {         return images.count     }          override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) - UICollectionViewCell {         let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "dataCell", for: indexPath) as! GalleryImageCell                  let asset = images[indexPath.row]         let ImageManager = PHImageManager.default()         if cell.tag != 0 {             ImageManager.cancelImageRequest(PHImageRequestID(cell.tag))         }                  cell.tag = Int(ImageManager.requestImage(for: asset, targetSize: CGSize(width: 120, height: 120), contentMode: .aspectFill, options: nil, resultHandler: { (result, _) in             cell.galleryImage?.image = result         }))                  return cell     }          func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) - CGSize {         let width = self.view.frame.width * 0.32         let height = self.view.frame.height * 0.179910045         return CGSize(width: width, height: height)     }          func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) - CGFloat {         return 2.5     }          func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) - UIEdgeInsets {         return UIEdgeInsets(top: 5, left: 5, bottom: 5, right: 5)     }          func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) - CGFloat {         return 0     }      } Anyway, when I load the view I only get a black view. The images are not displayed at all even though the cells seem to be created as the view scrolls for a good amount of time. It is not a problem related to Privacy Permissions as I've already granted access to "All Photos" and because ''images'' array contains all the photos assets. Do you know what I might be doing wrong? Thank you in advance, Alberto