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Nspersistentdocument

NSPersistentDocument is a subclass of NSDocument intended to work with Core Data.

Uimanageddocument

UIManagedDocument is a concrete subclass of UIDocument that integrates with Core Data



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Example

Unfortunately the sample apps are not based on uimanageddocument or nspersistentdocument but if you look at the way they handle backup files you could probably use that approach to create a document based app with less hassle than using uimanageddocument

from question  

How do I detect changes to a Core Data document in iCloud on OS X before the document gets reloaded?

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