An object that identifies a specific version of a record.
- iOS 8.0+
- macOS 10.10+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 3.0+
You do not create instances of this class yourself. When fetching records using a
CKFetch object, the server provides one of these objects along with the record changes. The next time you fetch the records, pass the previous token to the server. Passing the previous token tells the server what portions of the records to fetch and return to your app.