I am porting some Core Data code from iPhone to Mac OS X.
Problem is that the Core Data Framework on Mac OS X does not have NSFetchedResultsController.h
NSFetchedResultsController.h
On Mac OS X, you should probably be taking advantage of the Cocoa controllers. NSArrayController is probably what you want.
NSFetchedResultsController is now available on Mac OS X, 10.12 and above. https://developer.apple.com/documentation/coredata/nsfetchedresultscontroller
NSFetchedResultsController