Catching up with this Intro to WatchKit OS2. I found the following points interesting:
- ClockKit has templates for watch kit complications, matching the different shapes and sizes available on the various watch faces
- Complications should be immediately up to date when viewed, so watch kit allows you to bulk upload e.g. a timeline for a calendar widget that changes during the day.
- Watch connectivity allows data sharing between phone and watch
- CoreMotion, CoreLocation, MapKit and HealthKit APIs are available on the Watch