Get from cache then network?

[a1exb1]

How would i acheive this? I want to use cache to display whatever is available from cache on initial load, and then request the image from network if available - re-firing the same callback closure.

[kiavashfaisali]

Hello, thank you for this great question!

KFSwiftImageLoader doesn't currently have an easy way to do this as the emphasis is currently put on placeholder images.
Until the feature you mention is added to KFSwiftImageLoader, you could maintain a separate cache (NSURLCache, NSCache, etc.) strictly for placeholder purposes; i.e.

placeholderCache.cacheImage(imageView.image, forKey: urlString)



// The next time the app is launched, do something like:
imageView.loadImageFromURLString(urlString, placeholderImage: placeholderCache.cachedImageForKey(urlString)) {
    (finished, error) in

    // Cache the new image as a future placeholder.
    placeholderCache.cacheImage(imageView.image, forKey: urlString)
}

[a1exb1]

Wouldnt the loadImageFromURLString return the already cached image in this case?

[kiavashfaisali]

Yes, sorry about that, I forgot to include the following line as well:

KFImageCacheManager.sharedInstance.diskCacheMaxAge = 0

You should put that line in application:DidFinishLaunchingWithOptions: so that the file cache is purged when the app loads for the first time, and then from there since you've maintained your own placeholderCache, you can pull the previously cached image and put it as a placeholder.

Since there won't be a memory cache on first load, the image won't be loaded from cache in this case (nor the file cache due to the above line).

This solution is only good for first time load scenarios. I'll be adding this feature to the next version of KFSwiftImageLoader in the coming weeks as I'm going to overhaul the tool for Swift 2.0 as well by then.