Question

i hope someone can help me…

my code look like this

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(makeSomeThing:) name:NSManagedObjectContextObjectsDidChangeNotification
         object:nil];

i want to know which entity has changed no matter delete or update. just
which entity…
i want do something like that

-(void)makeSomeThing: (NSNotification *)noti
{
    if(entity == CarEntity)
        NSLog(@"makeSomeThing");
}

i can not figure out what entity has changed… i know there is a method [noti userInfo] but
i dont know what to do whit this.

thx and sorry for this horrible englich 🙂

Answer 1

The NSDictionary returned by [noti userInfo] for NSManagedObjectContextObjectsDidChangeNotification may contain keys NSInsertedObjectsKey, NSUpdatedObjectsKey, and NSDeletedObjectsKey. So [[noti userInfo] objectForKey:NSInsertedObjectsKey] will give you the objects inserted; the other two keys work similarly.

Do note that multiple objects can be inserted, updated, and/or deleted in one notification.