MacRuby can deal with specialized delegate methods like this one, but you need to generate a bridgesupport file for the framework you're targeting. Most frameworks that ship with Mac OS X are already covered, but in your case you might want to manually cover ObjectiveFlickr too.
Wow. This is way better than I expected. I didn't know bridgesupport was so well integrated with OS X. After a few hours of hacking, ObjectiveFlickr now has BridgeSupport and is MacRuby compliant :) http://github.com/lukhnos/objectiveflickr However, gen_bridge_metadata didn't work out-of-the box. I had to hack it a little to get a good dump. Some of the headers were parsed incorrectly. I guess I'll try to contact someone @ http://bridgesupport.macosforge.org about that. Thanks again for the help! -- Regards, Łukasz Adamczak