How to Cache Images in SwiftUI

Efficiently loading images is crucial for enhancing user experience in modern mobile applications. In SwiftUI, caching images to prevent repeated downloads is an essential technique. In this article, we’ll explore how to cache images in SwiftUI using asyncImage library.

asyncImage — ImageCaching

Introduction to asyncImage

AsyncImage is a library that simplifies asynchronous image loading and caching in SwiftUI. This library not only loads images from a URL but also caches them, reducing network traffic and improving the performance of your application.

Installation

First, you need to include the AsyncImage library in your project using Swift Package Manager.

1. Open your Xcode project.
2. Go to `File` -> `Add Packages`.
3. In the search bar, enter the following URL:

https://github.com/baskurthalit/asyncImage.git

4. Click Add Package to include the library in your project.

CAsyncImage provides a straightforward API for loading and caching images from a URL. Here is a basic example:

import SwiftUI
import asnycImage

struct ContentView: View {
    var body: some View {
        ScrollView {
            ForEach(0..<100) { index in
                let baseImageUrl:String = "https://picsum.photos/id/"
                let url:String = baseImageUrl.appending("\(index)/200")

                CAsyncImage(urlString: url) { image in
                    image
                        .resizable()
                } placeholder: {
                    ProgressView()
                }

            }
        }
    }
}

Cache Mechanism

asyncImage automatically caches the loaded images. This means that if the same URL is requested again, the cached version will be used, reducing network traffic. The caching process is managed in the background, so no additional configuration is needed.

Caching images in SwiftUI not only enhances the performance of your application but also ensures a smoother and faster user experience. asyncImage library makes asynchronous image loading and caching simple and effective. By following the steps outlined above, you can easily integrate asynchronous image loading and caching into your SwiftUI application.

I hope this article has been helpful in understanding how to cache images in SwiftUI. Feel free to leave any questions or feedback in the comments. Happy coding!