About SyncEngine.fetchChanges() behavior on macOS

[diatoming]

Hi,
i tried to use syncEngine.fetchChanges() to control changes pulling, it seems does nothing on macOS.
The log of that is like this, but it does not really pull the changes:

SQLiteData (shared.db) willFetchChanges
SQLiteData (private.db) didFetchChanges
SQLiteData (shared.db) didFetchChanges
SQLiteData (private.db) willSendChanges
SQLiteData (shared.db) willSendChanges
SQLiteData (shared.db) didSendChanges
SQLiteData (private.db) didSendChanges

On macOS, when app's main window became key window, cloud sync works for fetching and sending changes.
We can see some log like this:

SQLiteData (private.db) fetchedDatabaseChanges
...
SQLiteData (private.db) fetchedRecordZoneChanges
SQLiteData (private.db) stateUpdate
SQLiteData (private.db) willFetchRecordZoneChanges
SQLiteData (private.db) didFetchChanges

So, is there a way to make sync changes behavior same as 'when the window becomes key window'?

[mbrandonw]

Hi @diatoming, our methods just call down to the fetchChanges() method on CKSyncEngine, and I too have noticed that it does not actually pull unfetched changes like I would expect. But I'm not sure there is much we can do about it. I think it's just a bug in CKSyncEngine. I've noticed this behavior in Apple's sample code for the sync engine too.

You may need to filed a Feedback with Apple, or perhaps ask on their developer forums.

[diatoming]

Got it.
Thanks for the reply.