How make Apple Watch communication with core data?

To enable communication between Apple Watch and Core Data, you can leverage the synchronization features provided by Apple's frameworks. While the specific details of Core Data integration with Apple Watch were not directly covered in the provided WWDC segments, you can follow these general steps to achieve this:

Use Watch Connectivity Framework: This framework allows you to transfer data between your iOS app and your watchOS app. You can send updates from your iOS app to your watchOS app whenever there are changes in your Core Data store.
Live Activities and Smart Stack: If your app uses Live Activities, updates are automatically synchronized to Apple Watch. This is particularly useful if your app's data is represented in a live activity format. You can customize how these activities appear on the Apple Watch using the Smart Stack and dynamic island views.
Optimize for watchOS: When designing your app for Apple Watch, ensure that the most critical information is displayed due to the smaller screen size. You can customize your live activity views specifically for Apple Watch to provide a more engaging and informative experience.

For more detailed guidance on customizing live activities for Apple Watch, you can refer to the session Bring your Live Activity to Apple Watch (03:22).

If you are interested in learning more about the new features in watchOS 11, including how live activities are integrated, you might find the session What’s new in watchOS 11 (01:00) helpful.