Hello Laurentiu,
I would recommend using the sample app that is included in the SDK download package as a guide. I'm not an iOS UI expert by any means, but as far as I know we do have some elements defined via storyboard in there.
This repository seems to me to have had it's last update about three years ago. The sample app that is package with the SDK, however, is always updated to the latest state.
- Daniel
Laurentiu Pantelimon