CloudKit. Token change block of CKFetchRecordZoneChangesOperation not called

Question

I am trying to implement syncing with CloudKit. To fetch changes from the server i am using CKFetchRecordZoneChangesOperation. However recordZoneChangeTokensUpdatedBlock not called at all. Here is the code:

let options = CKFetchRecordZoneChangesOptions()
options.previousServerChangeToken = changesToken

let operation = CKFetchRecordZoneChangesOperation(recordZoneIDs: [paletteZoneId], optionsByRecordZoneID: [paletteZoneId:options])
operation.fetchAllChanges = true

operation.recordChangedBlock = {(record) in
   ...
}

operation.recordWithIDWasDeletedBlock = { (recordId,str) in
    ...
}

operation.recordZoneChangeTokensUpdatedBlock = { recordZoneId, token, data in
    print("new token")
    self.changesToken = token
}


operation.fetchRecordZoneChangesCompletionBlock = { error in
    ...
}

privateDB.add(operation)

So as the result operation is not working properly. Other blocks are called as expected.

Documentation says that token block should be called per zone, but it is not called at all.

I would really appreciate any help.

Many thanks.

Answer 1

the server change token is returned in a different block - you need to use recordZoneFetchCompletionBlock.