Basic Asynchronous NSFetchRequest Example

[managedObjectContext dct_asynchronousFetchRequest:fetchRequest
				 withCallbackBlock:^(NSArray *fetchedObjects, NSError *error) {
	
    // Do something with the fetched objects in this callback block.
    NSLog(@"fetchedObjects: %@", fetchedObjects);
    NSLog(@"error: %@", error);
}];