AFNetworking/AFNetworking — pull request #296 by pocketpixels (2012-04-12 21:45:10+00:00)
Title: Adding support for a separate dispatch queue for image processing in AFImageRequestOperation

Image processing can be quite expensive. Therefore it is often important to get it off the main thread, even though the final image is to be returned and used on the main thread.

This patch adds support for using a separate dispatch queue for the image processing block.

Currently this patch only implements the iOS version. The equivalent OSX method would need to be changed accordingly as well.

But please take a look and consider if this code is correct and if it could make sense to integrate it into the official AFNetworking implementation.