Swift Haneke: cache doesn't resolve - swift

Question

I'm trying to pre-load some images with the following code:
let thumbnailUrl = NSURL(string: urlString)
let fetcher = NetworkFetcher<UIImage>(URL: thumbnailUrl)
Shared.imageCache.fetch(fetcher) {
println("Finished")
}
But afterwards when I try to set it to the imageview, it downloads it again from the network instead of reading it from the cache. This is the code:
self.imageView.hnk_setImageFromURL(
NSURL(string: urlString)
success: { thumbnail in
println("Finished setting image")
}
)
Is this a bug or maybe I missunderstood the usage of imageCache.fetch()?
PD: I put breakpoints in the whole code, and I can guarantee the key for the cache (in this case, the url) is exactly the same, so I have no clue why the cache isn't resolving when used with .hnk_setImageFromURL()

Answer 1

I was stuck on this for 3 days. I hope this answer might help someone else in the future.
The issue was that I didn't specify a Format Name to the fetcher, while the UIImageView.hnk_setImageFromURL() does. The way to fix it is:
let thumbnailUrl = NSURL(string: urlString)
let fetcher = NetworkFetcher<UIImage>(URL: thumbnailUrl)
let cache = Shared.imageCache
let format = self.imageView.hnk_format
cache.fetch(fetcher, formatName: format.name) {
println("Finished")
}