I haven't done a larger project, but I did port a small project by starting with just the AppDelegate. It was easier to first turn the xcode project/obj-c code

I haven't done a larger project, but I did port a small project by starting with just the AppDelegate. It was easier to first turn the xcode project/obj-c code into a library, and compile it as such. The classes "just worked", and with all the nibs in resources/ those loaded, too! I translated the models into Ruby, and pulled those out of the xcode lib. Eventually the entire codebase was converted (except the nibs).