objective c - NSManagedObjectContextObjectsDidChangeNotification NSDeletedObjectsKey Objects no longer has references to related objects -

objective c - NSManagedObjectContextObjectsDidChangeNotification NSDeletedObjectsKey Objects no longer has references to related objects -

i want respond changes of nsmanagedobjects have been added, updated, or deleted.

i have issue deleted objects, though: relationships other objects nil.

is there way kind of notification before object affected way?

edit:

this delete code:

[moc deleteobject:myobject]; id saveblock = ^{ nserror *error = nil; bool saved = no; saved = [self save:&error]; // error handling. }; [moc performblockandwait:saveblock];

if wanting react deletions should listening nsmanagedobjectcontextwillsavenotification , watch nsdseletedobjectskey come through part of notification. lastly chance before deletion deal them.

objective-c core-data nsmanagedobject nsmanagedobjectcontext