The change token from a previous fetch operation.
- iOS 8.0–11.0Deprecated
- macOS 10.10–10.13Deprecated
- Mac Catalyst 13.0–13.0Deprecated
- tvOS 9.0–11.0Deprecated
- watchOS 3.0–4.0Deprecated
Assign the token you received previously from the
fetch completion block to this property. Doing so yields only the notifications that have arrived since your last fetch operation. If you specify
nil for this parameter, the operation starts fetching notifications at the beginning of the list and returns all but those that have already been marked as read.