How do I cache responses and use URLCache in Swift?

In Swift, caching responses using `URLCache` is a straightforward process that enhances the performance of your network requests by storing data for future use. Implementing a custom caching strategy can significantly reduce load times and network usage.

To utilize `URLCache` effectively, follow these steps:

  1. Create a cache configuration.
  2. Set up a `URLSession` with the cache.
  3. Make a network request and cache the response.
  4. Retrieve the cached response when needed.

Example of Utilizing URLCache in Swift

// Step 1: Create and configure the URLCache let cacheSizeMemory = 512 * 1024 // 512 KB let cacheSizeDisk = 20 * 1024 * 1024 // 20 MB let urlCache = URLCache(memoryCapacity: cacheSizeMemory, diskCapacity: cacheSizeDisk, diskPath: nil) // Step 2: Set up a URLSession with the cache let sessionConfiguration = URLSessionConfiguration.default sessionConfiguration.urlCache = urlCache let session = URLSession(configuration: sessionConfiguration) // Step 3: Make a network request let url = URL(string: "https://api.example.com/data")! let request = URLRequest(url: url) session.dataTask(with: request) { data, response, error in if let data = data, let response = response { // Cache the response for future use if let httpResponse = response as? HTTPURLResponse, httpResponse.statusCode == 200 { let cachedResponse = NSCachedURLResponse(response: response, data: data) urlCache.storeCachedResponse(cachedResponse, for: request) } } }.resume() // Step 4: Retrieve the cached response if let cachedResponse = urlCache.cachedResponse(for: request) { // Use the cached data let cachedData = cachedResponse.data print("Cached Data: \(cachedData)") }

swift urlcache caching urlsession network requests performance ios development

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