Error codes that are returned by CloudKit.
- iOS 8.0+
- macOS 10.10+
- tvOS 9.0+
- watchOS 3.0+
To find out what happened to each individual item, your app needs to look at the
CKPartial key in the top-level error's
user dictionary. Under this key, you will find a dictionary with an entry for each item that encountered an error. Make sure to handle each error individually, because there could be multiple different failures in a single operation.