How does one target know another saved Core Data?

I'm using multiple targets in my project and so I've created an App Group to allow both targets to read/write from Core Data. The saves happen in the second target, and if I restart the app my table display the newly saved item.


What I can't figure out though is when the other target saves a new entity, how do the NSFetchedResultsController in the primary target know to refresh the table?


I've tried catching things from NotificationCenter but those don't seem to cross targets.

How does one target know another saved Core Data?
 
 
Q