I’ve been learning iOS development for the last year, and recently launched my first app.
https://itunes.apple.com/us/app/cfb-database/id1370146900?ls=1&mt=8
The app is a searchable database for college football fans, and contains tens of thousands of historical scores, player data, and rosters for nearly 200 teams.
I use Firebase as my backend service, and use deep-linking URLs and push notifications as well. I have also integrated 3D Touch and Quick Actions thought the application.