Stanford CS193p: iOS Development with SwiftUI | 2025 | L9: Protocols

Welcome to lecture number 9,  Stanford CS193p, Spring of 2025.

I'm going to go to the demo for a brief time at  the beginning here to talk about our pop quiz,

the only pop quiz we have the quarter  and probably the only one we will have,   but it was kind of a fun experiment. And then I also teased elapsed time.

Remember that? I kind of teased,   oh, we could put elapsed time in there. So, I'm actually going to show you how to do that.  We'll just take a little time out and  say how would we do a lapse and elapse

timer like that in our UI. Now I'm going to hop back   into the slides here and finish up  talking about the Swift type system.