How to assign UIImage to message without using URI?

[apwelsh]

I see in the example app how to add images, hiwever, I am using a caching engine for my images, not actual files on the filesystem, not standard web URLs. How do I add a UIImage attachment, or NSData encoded image, from an in-memory reaource (no URI)?

Should I create a custom message cell somehow, to handle this instead?