cache images to temporary storage in swift

To cache images to temporary storage in Swift, we can use the built-in URLCache class of URLSession.


main.swift
// Create a new URLCache with memory capacity of 4MB and disk capacity of 20MB
let cache = URLCache(memoryCapacity: 4 * 1024 * 1024, diskCapacity: 20 * 1024 * 1024, diskPath: nil)

// Set the shared URLCache to our newly created cache
URLCache.shared = cache
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Then, when making requests with URLSession, we can use a URLSessionConfiguration object that includes the cache policy in order to enable caching for our requests.


main.swift
// Create a new URLSessionConfiguration with the default cache policy
let config = URLSessionConfiguration.default

// Set the configuration's URLCache to the shared cache we created earlier
config.urlCache = URLCache.shared

// Create a new URLSession with the configuration
let session = URLSession(configuration: config)

// Make a request using the session
let request = URLRequest(url: URL(string: "http://example.com/image.jpg")!)
let task = session.dataTask(with: request) { (data, response, error) in
    // Handle the response and data as desired
}

// Resume the task to initiate the request
task.resume()
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With this setup, any subsequent requests for the same image (with the same URL) through our URLSession will be served from the cache rather than making a new network request.

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