What is the most efficient way to observe managed object context changes for specific entity types in iOS?

Sorry if this has been discussed to death elsewhere, but I couldn't find a question that directly addresses my request.

I am working on an application that downloads objects from a remote server in JSON format and converts the result to basic data objects.

I have used NSFetchedResultsController

for a while to observe changes to objects for certain types of entities when applying a filter NSPredicate

. The purpose here is to inform about changes only when managed objects that meet certain criteria have been added, changed, or removed.

I know NSManagedObjectContextObjectsDidChangeNotification

of NSManagedObjectContext

, however I understand that the dictionary -userInfo

contains all changes to objects, regardless of the entity.

My concerns may be unfounded, but since I am not using NSFetchedResultsController

for control UITableView

am I wastefully using a class for this purpose?

Is there a better way to notify me when objects of a particular object type and property values ​​have been added, changed, or removed?

Many thanks.

Ps I am aware of accessibility NSArrayController

in Cocoa, which appears to contain the required functionality, although I have not experimented with it. This class is not available for iOS.