It is a great tutorial. However the end from around @46:00 is going to demonstrate some really old code in obj c. probably that's why apple removed the video fron the WWDC page? there has to be a better way than to prototyping in obj c LOL!
You obviously didn't listen to the actual tutorial. He explained why they were using Objective-C for the demo. This is an old video. Apple weren't using Swift internally much back in 2015.
Apple removed this session's information on its developer website. Do you still have the original mp4 and slide PDF? I've been looking for it for so long...
