UITableView Multiple Checkmark Selection

Question

Having read a couple of the questions asked relating to this, I can get the functionality to work. However my list is long and scrollable, so when I scroll up and down the selection of the checkmarks are all over the place. selectedIndexes is a NSMutableArray. Any ideas?

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    UITableViewCell *selectedCell = [tableView cellForRowAtIndexPath:indexPath];

    if ([selectedCell accessoryType] == UITableViewCellAccessoryNone) {
        [selectedCell setAccessoryType:UITableViewCellAccessoryCheckmark];
        [selectedIndexes addObject:[NSNumber numberWithInt:indexPath.row]];

    } 
    else {
        [selectedCell setAccessoryType:UITableViewCellAccessoryNone];
        [selectedIndexes removeObject:[NSNumber numberWithInt:indexPath.row]];

    }

    [tableView deselectRowAtIndexPath:indexPath animated:NO];

}

In my cellForRowAtIndexPath: i have the following check.

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    static NSString *CellIdentifier = @"CustomCell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
    }

    // Configure the cell...
    NSDictionary *dictionary = [natures objectAtIndex:indexPath.section];
    NSArray *array = [dictionary objectForKey:@"Name"];
    NSString *cellValue = [array objectAtIndex:indexPath.row];
    cell.textLabel.text = cellValue;

    for (int i = 0; i < selectedIndexes.count; i++) {
        NSUInteger num = [[selectedIndexes objectAtIndex:i] intValue];

        if (num == indexPath.row) {
            [cell setAccessoryType:UITableViewCellAccessoryCheckmark];
        }
        else {
            [cell setAccessoryType:UITableViewCellAccessoryNone];
        }

    }

    return cell;
}

Answer 1

For multiple selection you just need on viewDidLoad

self.tableView.allowsMultipleSelection = YES;

and

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *tableViewCell = [tableView cellForRowAtIndexPath:indexPath];
    tableViewCell.accessoryView.hidden = NO; 
    // if you don't use a custom image then tableViewCell.accessoryType = UITableViewCellAccessoryCheckmark;
}

- (void)tableView:(UITableView *)tableView didDeselectRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *tableViewCell = [tableView cellForRowAtIndexPath:indexPath];
    tableViewCell.accessoryView.hidden = YES;
    // if you don't use a custom image then tableViewCell.accessoryType = UITableViewCellAccessoryNone;
}