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I have an Mac Application using a NSPersistentDocument. I want to get notified when Objects are deleted to save this information using Core Data. So I'm listening for NSManagedObjectContextObjectsDidChangeNotification. Often it is called instantly when objects are deleted, but sometimes it is only called after the persistent document is saved with all deleted objects not being notified before. Because I want to let the user directly export all existing objects (and not the deleted anymore) what to I have to do to become notified instantly to save the delete information or do I have to use it in another way?

Tobe
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1 Answers1

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NSManagedObjectContextObjectsDidChangeNotification is no longer issued as frequently or quickly on 10.7 as on 10.6. You can force Core Data to issue the notification (assuming there are changes) by calling -[NSManagedObjectContext processPendingChanges].

Aderstedt
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  • thanks so far. I want to use this when data is deleted from a TableView that has a ArrayController as its source. Can I interrupt in another part to store information I need or to call processPendingChanges? – Tobe Oct 14 '11 at 11:58
  • You can observe the arrangedObjects on the NSArrayController, and perform processPendingChanges there. – Aderstedt Oct 16 '11 at 05:27
  • thanks, observing arrangedObjects and calling processPendingChanges sends the notification instantly. That's what I needed. – Tobe Oct 17 '11 at 11:41