Is it possible to convert each page in a PDF into separate images and then add those images to separate slides in an Apple Keynote file all with Objective-C and on iOS? After that, if that was possible - I would then need to import that keynote file into Keynote, again, on iOS.
Some basic playing around with the core-graphics pdf api should get you the UIImages for each page. For the Keynote part you might need to do some more digging.