Initializes and returns an operation object configured with the previous change token.
- iOS 10.0+
- macOS 10.12+
- tvOS 10.0+
- watchOS 3.0+
The previous change token.
An initialized operation object.
After initializing the operation, assign a block to the
fetch property to process the results.
If a change anchor from a previous
CKFetch is passed in, only the zones that have changed since that anchor will be returned.
CKServer is not to be confused with the per-recordZone
If this is your first fetch or if you wish to re-fetch all zones, pass
nil for the change token. Change tokens are opaque and clients should not infer any behavior based on their content.