# recordZoneFetchResultBlock The closure to execute when a record zone’s fetch finishes. ``` var recordZoneFetchResultBlock: ((CKRecordZone.ID, Result<(serverChangeToken: CKServerChangeToken, clientChangeTokenData: Data?, moreComing: Bool), any Error>) -> Void)? { get set } ``` ## Discussion The closure returns no value and takes the following parameters: - `recordZoneID`: The record zone’s ID. - `fetchChangesResult`: A that contains either: - A successful `Result` of - The change token to store and use in subsequent instances of [`CKFetchRecordZoneChangesOperation`](/documentation/CloudKit/CKFetchRecordZoneChangesOperation). - The more recent client change token from the device. If the change token isn’t the more recent change token you provided, the server might not have received the associated changes. - A Boolean that indicates whether this is the final record zone change. If [`fetchAllChanges`](/documentation/CloudKit/CKFetchRecordZoneChangesOperation/fetchAllChanges) is , it’s the app’s responsibility to create additional instances of [`CKFetchRecordZoneChangesOperation`](/documentation/CloudKit/CKFetchRecordZoneChangesOperation) to fetch further changes. - An error object that contains information about a problem encountered retrieving the record zone changes. The app is responsible for saving the change token at the end of the operation and providing it to future uses of [`CKFetchRecordZoneChangesOperation`](/documentation/CloudKit/CKFetchRecordZoneChangesOperation). Each time the closure executes, it executes serially with respect to the other closures of the operation. Set this property before you execute the operation or submit it to a queue. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)