Boilerplate NSFetchedResultsControllerDelegate methods for a UITableViewController subclass

NSFetchedResultsControllerDelegate_Boilerplate.m

#pragma mark - NSFetchedResultsControllerDelegate methods

- (void)controllerWillChangeContent:(NSFetchedResultsController *)controller {
    [self.tableView beginUpdates];
}

- (void)controller:(NSFetchedResultsController *)controller
   didChangeObject:(id)anObject
       atIndexPath:(NSIndexPath *)indexPath
     forChangeType:(NSFetchedResultsChangeType)type
      newIndexPath:(NSIndexPath *)newIndexPath {
    
    UITableView *tableView = self.tableView;
    
    switch(type) {
            
        case NSFetchedResultsChangeInsert:
            [tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:newIndexPath]
                             withRowAnimation:UITableViewRowAnimationFade];
            break;
            
        case NSFetchedResultsChangeDelete:
            [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath]
                             withRowAnimation:UITableViewRowAnimationFade];
            break;
            
        case NSFetchedResultsChangeUpdate: {
            UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
            if (cell != nil) {
                [self configureCell:cell withObject:anObject];
            }}
            break;
            
        case NSFetchedResultsChangeMove:
            [tableView deleteRowsAtIndexPaths:[NSArray
                                               arrayWithObject:indexPath]
                             withRowAnimation:UITableViewRowAnimationFade];
            [tableView insertRowsAtIndexPaths:[NSArray
                                               arrayWithObject:newIndexPath]
                             withRowAnimation:UITableViewRowAnimationFade];
            break;
    }
}

- (void)controller:(NSFetchedResultsController *)controller
  didChangeSection:(id )sectionInfo
           atIndex:(NSUInteger)sectionIndex
     forChangeType:(NSFetchedResultsChangeType)type {
    
    switch(type) {
            
        case NSFetchedResultsChangeInsert:
            [self.tableView insertSections:[NSIndexSet indexSetWithIndex:sectionIndex]
                          withRowAnimation:UITableViewRowAnimationFade];
            break;
            
        case NSFetchedResultsChangeDelete:
            [self.tableView deleteSections:[NSIndexSet indexSetWithIndex:sectionIndex]
                          withRowAnimation:UITableViewRowAnimationFade];
            break;
    }
}

- (void)controllerDidChangeContent:(NSFetchedResultsController *)controller {
    [self.tableView endUpdates];
}

BTW, this snippet of boilerplate from the NSFetchedResultsControllerDelegate documentation is buggy:

case NSFetchedResultsChangeUpdate:
    [self configureCell:[tableView cellForRowAtIndexPath:indexPath] atIndexPath:indexPath];
    break;

See these links for explanation and fixes:

• http://oleb.net/blog/2013/02/nsfetchedresultscontroller-documentation-bug/
• http://stackoverflow.com/questions/11432556/nsrangeexception-exception-in-nsfetchedresultschangeupdate-event-of-nsfetchedres
• http://wangling.me/2011/09/bugs-of-nsfetchedresultscontrollerdelegate-template-code.html

See https://gist.github.com/kristopherjohnson/d5dd8c6babe56f567184 for Swift equivalent