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CKFetchRecordChangesOperationMBS class

Super class: CKDatabaseOperationMBS

Type Topic Plugin Version macOS Windows Linux Console & Web iOS
class CloudKit MBS Mac64bit Plugin 16.5 Yes No No Yes, macOS only No
Function: A CKFetchRecordChangesOperation object reports on the changed and deleted records in the specified record zone.
Notes:
Use this type of operation object to optimize fetch operations for locally managed sets of records. Specifically, use it when you maintain a local cache of your record data and need to synchronize that cache periodically with the server.

To get the most benefit out of a CKFetchRecordChangesOperation object, you must maintain a local cache of the records from the specified zone. Each time you fetch changes from that zone, the server provides a token that identifies your request. With each subsequent fetch request, you initialize the operation object with the token from the previous request, and the server returns only the records that changed since that request.

The blocks you assign to process the fetched records are executed serially on an internal queue managed by the operation. Your blocks must be capable of executing on a background thread, so any tasks that require access to the main thread must be redirected accordingly.

The completed event is called after the operation executes and returns its results to you. You can use a completion block to perform housekeeping chores related to the operation, but do not use it to process the results of the operation itself. Any completion block you specify should be prepared to handle the failure of the operation to complete its task, whether due to an error or an explicit cancellation.

Available in 10.10 and newer and deprecated with 10.12.
Subclass of the CKDatabaseOperationMBS class.

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Super class CKDatabaseOperationMBS

Super class CKOperationMBS

This class has no sub classes.


The items on this page are in the following plugins: MBS Mac64bit Plugin.


CKFetchNotificationChangesOperationMBS   -   CKFetchRecordsOperationMBS





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