Customizing UITableViewCell with Async Image Loading and Caching for iOS 17
I'm updating my dependencies and I'm migrating some code and I'm wondering if anyone has experience with I'm trying to implement a custom `UITableViewCell` that loads images asynchronously from a URL and caches them for better performance in my iOS 17 application. However, I'm facing issues with cells showing the wrong images when scrolling fast. The images sometimes don't match with the row they are in, particularly when the table view is scrolled quickly. I've implemented a simple caching mechanism but it doesn't seem to be working as expected. Here’s a snippet of my code for the cell configuration: ```swift class CustomTableViewCell: UITableViewCell { @IBOutlet weak var customImageView: UIImageView! func configure(with imageUrl: String) { // Clear the image view before loading a new image customImageView.image = nil // Check if the image is cached if let cachedImage = ImageCache.shared.image(forKey: imageUrl) { customImageView.image = cachedImage return } // Load image asynchronously DispatchQueue.global().async { [weak self] in if let url = URL(string: imageUrl), let data = try? Data(contentsOf: url), let image = UIImage(data: data) { // Cache the image ImageCache.shared.setImage(image, forKey: imageUrl) DispatchQueue.main.async { // Ensure the cell is still visible if let strongSelf = self { strongSelf.customImageView.image = image } } } } } } ``` I am using a simple singleton pattern for caching images. Here’s a basic implementation: ```swift class ImageCache { static let shared = ImageCache() private var cache = NSCache<NSString, UIImage>() func image(forKey key: String) -> UIImage? { return cache.object(forKey: NSString(string: key)) } func setImage(_ image: UIImage, forKey key: String) { cache.setObject(image, forKey: NSString(string: key)) } } ``` I’ve tried ensuring that I clear the image view before loading a new image, but it seems that the cell may be reused before the image is loaded, causing the wrong image to appear. I’ve also looked into using `UIImageView`'s `setImage(with:)` method from a third-party library like SDWebImage, but I’d prefer to keep it lightweight without adding external dependencies. Is there a better approach to handle this situation? Any best practices or patterns I should consider to avoid this image mismatch issue? Thanks in advance! The project is a desktop app built with Swift. I'm developing on Windows 11 with Swift. Thanks for any help you can provide! What am I doing wrong? I'm on Windows 11 using the latest version of Swift. Any help would be greatly appreciated!