How do I implement caching in iOS?

How do I implement caching in iOS?

To implement caching in iOS, you can use NSCache or store data in the file system. What type of data are you looking to cache?

I'm looking to cache images from a web API.

For caching images, you can use libraries like SDWebImage or create your own caching mechanism using NSCache to store images in memory.

Can you show me a code example?

Sure! Here's a simple example using NSCache:

let imageCache = NSCache<NSString, UIImage>()

func loadImage(from url: String) {
    if let cachedImage = imageCache.object(forKey: url as NSString) {
        // Use cached image
    } else {
        // Download image and cache it
    }
}

What about caching data from JSON responses?

You can cache JSON data similarly by saving it to the file system or using UserDefaults for small data. Would you like a code example for that?