Detect if UIImage is preloaded?

Question

I am working on an image viewer application. I noticed some lag when scrolling and discovered this code to solve the problem:

https://gist.github.com/steipete/1144242

Basically, it just draws the UIImage, to preload/cache it, making the scrolling nice and smooth.

Is there anyway to detect whether a given UIImage is preloaded?

Answer 1

Asked at WWDC, there isn't a way to tell. So I used associated objects attached to my UIImage to track whether it was preloaded or not.