Question 1

How to set up Mattress for offline caching in an iOS app?

Accepted Answer

Create a Mattress.URLCache instance, set it as the shared cache in `application:didFinishLaunchingWithOptions:`, and use `diskCacheURL` to cache specific URLs, as detailed in the README usage example. Ensure you handle offline status detection with a custom handler.

Question 2

Mattress vs standard NSURLCache: what's the difference?

Accepted Answer

Mattress extends NSURLCache by adding a separate disk cache for complete web pages, making it better for offline browsing, while standard NSURLCache is more general-purpose for caching network responses without full page storage.

Question 3

Can Mattress cache pages with dynamic JavaScript content?

Accepted Answer

Yes, but you must trigger JavaScript functions in the loadedHandler to load all assets, as noted in the README for pages with progressively loaded images. This adds complexity for highly dynamic content.

Question 4

How does Mattress handle background fetching for pre-caching?

Accepted Answer

Mattress supports background pre-caching, allowing pages to be cached without active internet, but since caching work happens on the main thread, it may impact performance if done excessively in the foreground.

Question 5

What are the alternatives to Mattress for iOS offline caching?

Accepted Answer

Alternatives include using WKWebView's built-in caching for newer apps, third-party libraries like SDWebImage for image-specific caching, or custom NSURLProtocol implementations, but Mattress is specialized for entire web pages.

Question 6

Is Mattress compatible with SwiftUI?

Accepted Answer

Mattress is designed for UIKit and UIWebView, so it doesn't integrate directly with SwiftUI's web views. Its reliance on UIWebView makes it less suitable for modern SwiftUI apps that use WKWebView via UIViewRepresentable.

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