How to Set Up Core Data and CloudKit
Turns out, if you want to sync Core Data-backed data between devices and have those changes reflected in your UI in a timely manner, you have some more work to do. To figure out what that work is, you can’t look at Apple’s Core Data templates. You have to look at their sample code.
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Don’t be like me: make sure your schema is deployed.
After launch, remember that you still have to do this every time you change your Core Data model, before you release your update to testers or the App Store. If your production CloudKit schema doesn’t properly correspond to your production Core Data model, syncing is going to break in all kinds of terrifying ways.
Previously:
