Creating a tableView Index

This implementation is from a tableView that is using coreData & fetchRequests as the model. It's necessary to implement the following dataSource delegate methods. Also there is a simple method in the table's data class which selects for 'first character'.

 in WordsTableViewController.m - implement the following delegate methods
#pragma mark - UITableViewDataSource indexList Methods
- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView {
    return [self.fetchedResultsController sectionIndexTitles];
}
- (NSInteger)tableView:(UITableView *)tableView sectionForSectionIndexTitle:(NSString *)title atIndex:(NSInteger)index {
    return [self.fetchedResultsController sectionForSectionIndexTitle:title atIndex:index];
}

 in Items.m - this method uses the 1st character of each word as it's index
-(NSString *)firstChar {
    return [self.word substringToIndex:1U];
}

in WordTableViewController.m - And most importantly in the (void)setupFetchedResultsController method  the firstChar is used as the sort parameter.
    self.fetchedResultsController = [[NSFetchedResultsController alloc]
            initWithFetchRequest:request
            managedObjectContext:self.wordDictionary.managedObjectContext
            sectionNameKeyPath:@"firstChar"
            cacheName:nil];

ref: myDictionary by CPL