fetchRecordChangesCompletionBlock
The block to execute when the system finishes processing all changes.
Declaration
var fetchRecordChangesCompletionBlock: ((CKServerChangeToken?, Data?, (any Error)?) -> Void)? { get set }Discussion
The block returns no value and takes the following parameters:
serverChangeTokenThe new change token from the server. You can store this token locally and use it during subsequent fetch operations to limit the results to records that the system changes after executing the operation.
clientChangeTokenThe most recent client change token from the device. If the change token isn’t the most recent change token you provided, the server might not have received the associated changes.
operationErrorAn error object that contains information about a problem, or
nilif the system successfully retrieves the changes.
When implementing this block, check the moreComing property of the operation object to verify that the server was able to deliver all results. If that property is true, you must create another operation object using the value in the serverChangeToken parameter to fetch any remaining changes.
The operation object executes this block only once at the conclusion of the operation. It executes after all individual change blocks, but before the operation’s completion block. The block executes serially with respect to the other progress blocks of the operation.
If you intend to use this block to process results, set it before executing the operation or submitting the operation object to a queue.