Question

Question is pretty clear I guess. I have a UISegmentedControl as my tableViewHeader. I have a selector callback when a segment has been touched. Up on that touch event I would like to reload the tableView using a new NSSortDescriptor.

Answer 1

Just do something like the following when a segment is selected:

yourFetchedResultsController.sortDescriptors = // whatever
[NSFetchedResultsController deleteCacheWithName:yourFetchedResultsController.cacheName]; // if necessary
[yourFetchedResultsController performFetch:&error];
[yourTableView reloadData];