How do I handle image caching in Combine with Swift?

Handling image caching in Combine with Swift involves using URLSession alongside Combine’s publisher and subscriber model. Here’s a basic example of how you can implement image caching to optimize your image loading performance in a Swift application. This method ensures that images are fetched from the cache when available, reducing network calls and improving user experience.


    import Combine
    import UIKit

    class ImageLoader {
        private var cancellables = Set()
        private var imageCache = NSCache()
        
        func loadImage(from url: URL) -> AnyPublisher {
            if let cachedImage = imageCache.object(forKey: url.absoluteString as NSString) {
                return Just(cachedImage).eraseToAnyPublisher()
            }
            
            return URLSession.shared.dataTaskPublisher(for: url)
                .map { $0.data }
                .map(UIImage.init)
                .handleEvents(receiveOutput: { [weak self] image in
                    if let image = image {
                        self?.imageCache.setObject(image, forKey: url.absoluteString as NSString)
                    }
                })
                .replaceError(with: nil)
                .eraseToAnyPublisher()
        }
    }

    // Usage example
    let imageLoader = ImageLoader()
    let imageURL = URL(string: "https://example.com/image.png")!
    imageLoader.loadImage(from: imageURL)
        .sink(receiveValue: { image in
            // Update UI with the loaded image
            print(image)
        })
        .store(in: &imageLoader.cancellables)

How do I handle image caching in Combine with Swift?

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How do I handle image caching in Combine with Swift?

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