UITableViewDataSource sectionIndexTitlesForTableView example in Objective C (iOS).

UITableViewDataSource sectionIndexTitlesForTableView

Asks the data source to return the titles for the sections for a table view.

- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView

Parameters
tableView
The table-view object requesting this information.

Return Value of [UITableViewDataSource sectionIndexTitlesForTableView]
An array of strings that serve as the title of sections in the table view and appear in the index list on the right side of the table view. The table view must be in the plain style (UITableViewStylePlain). For example, for an alphabetized list, you could return an array containing strings “€A”€ through “Z”.

UITableViewDataSource sectionIndexTitlesForTableView example.

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    return [[fetchedResultsController sections] count];
}

- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView {
    return [fetchedResultsController sectionIndexTitles];
}

- (NSInteger)tableView:(UITableView *)tableView sectionForSectionIndexTitle:(NSString *)title atIndex:(NSInteger)index {
    return [fetchedResultsController sectionForSectionIndexTitle:title atIndex:index];
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    id <NSFetchedResultsSectionInfo> sectionInfo = [[fetchedResultsController sections] objectAtIndex:section];
    return [sectionInfo numberOfObjects];
}

Example of [UITableViewDataSource sectionIndexTitlesForTableView].

Supply your own index characters:

- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView {
    return[NSArray arrayWithObjects:@"a", @"e", @"i", @"m", @"p", nil];
}
and then:

- (NSInteger)tableView:(UITableView *)tableView sectionForSectionIndexTitle:(NSString
    *)title atIndex:(NSInteger)index {
        return <yourSectionIndexForTheSectionForSectionIndexTitle >;
}
You will need sections.

UITableViewDataSource sectionIndexTitlesForTableView example.

- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView {
    if (thisTableDataIsShowing)
    {
        NSMutableArray *charactersForSort = [[NSMutableArray alloc] init];
        for (NSDictionary *item in d_itemsInTable)
        {
            if (![charactersForSort containsObject:[[item valueForKey:@"character_field_to_sort_by"] substringToIndex:1]])
            {
                [charactersForSort addObject:[[item valueForKey:@"character_field_to_sort_by"] substringToIndex:1]];
            }
        }
        return charactersForSort;
    }
    return nil;
}

End of UITableViewDataSource sectionIndexTitlesForTableView example article.