So far I’ve only had time to watch the various Swift updates. I wrote about async/await the other day, and I will spend some time later this summer thinking about Sprint-o-Mat’s asynchronous code.

Pretty much the entire app is reactive to asynchronous events, the workout progression, the passage of time, the changing location, and health metrics all come in via delegates and callbacks. I publish those to the UI via Combine. That might still be the best way as we’re dealing with a sequence of asynchronous values, but filling them up may be simpler with the new APIs. I’m not sure yet if this is a use-case for the new AsyncSequence.

I will certainly support the always-on screen—mostly I need to make sure to slow updates to one per second when dimmed. I might also alter the UI in this state to simplify it.

I also saw that there’s a MusicKit now and I’ve been wanting to bring music into Sprint-o-Mat for a while. I already support an in-app media player, but I’ve been wanting automatic music changes during sprints and rests.

One thing I’ve been interested in exploring is communication to an iPhone app. I want Sprint-o-Mat to stay an independent watch app. I am looking for ways for it to communicate to an iPhone app that is perhaps in the same group, but not necessarily in the same bundle. I don’t think there’s anything new here, but there are some watch connectivity sessions, so I have to check those out.