Hey, 6+ years of iOS development here. I'll have within one week as requested. No need for a game engine, I'd say let's use standard cocoa components. It's just a trivia for personal use. The rest is clear, I have no further questions. Upon starting we can agree on how to present the images, there are a couple of simple options.
Hablo Español también. All my work comes with 3 months warranty against programming defects after project completion. Also, if you haven't coded the backend, may I recommend Firebase?
Thanks,
Sergio