How do I handle image caching in UIKit with Swift?

In UIKit with Swift, image caching is an important technique to improve the performance of your app when dealing with images, especially when loading images from the web. By caching images, you can prevent unnecessary network calls, reduce loading times, and enhance user experience.

One common approach to handling image caching is to use a third-party library like SDWebImage or implement your own caching mechanism using NSCache. Below is an example of how to implement simple image caching using NSCache in UIKit.

import UIKit class ImageCache { static let shared = NSCache() func loadImage(from url: URL, completion: @escaping (UIImage?) -> Void) { // Check if the image is already cached if let cachedImage = ImageCache.shared.object(forKey: url.absoluteString as NSString) { completion(cachedImage) return } // Download the image if it's not cached let task = URLSession.shared.dataTask(with: url) { data, response, error in guard let data = data, error == nil, let image = UIImage(data: data) else { completion(nil) return } // Cache the image ImageCache.shared.setObject(image, forKey: url.absoluteString as NSString) completion(image) } task.resume() } } // Usage let imageView = UIImageView() let imageURL = URL(string: "https://example.com/image.png")! ImageCache.shared.loadImage(from: imageURL) { image in DispatchQueue.main.async { imageView.image = image } }

UIKit Swift Image Caching NSCache SDWebImage Performance Improvement

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