objective c - Iphone: Checkmarks in UITableview get mixed up when scrolling

Question

I have a bit of a problem where my check marks that i apply to my rows in my UITableView get all mixed up when i scroll. Im pretty sure this has to do with how the iphone reuses the cells and when i scroll away from on that has a check mark it probably puts it back in when i gets a chance.

Could someone please give me some tips on how I might avoid this or possibly take a look at my methods and see if anything looks off?

I was thinking that maybe I could save each row selection that the user made and then check to see which rows were being displayed to make sure the correct ones got the checkmark but I could'nt see a way to do so.

Thanks so much.

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

static NSString *CellIdentifier = @"Cell";

CustomCell *cell = (CustomCell*)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
    cell = [[[CustomCell alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier] autorelease];
    [cell setAccessoryView:nil];
}

NSMutableArray *temp = [[NSMutableArray alloc]init];
for (int j = 0; j < [listOfRowersAtPractice count]; j++) {
    if ([[differentTeams objectAtIndex:indexPath.section] isEqualToString:[[rowersAndInfo objectForKey:[listOfRowersAtPractice objectAtIndex:j]]objectForKey:@"Team"]]) {
        [temp addObject:[listOfRowersAtPractice objectAtIndex:j]];
    }
}

[cell.cellText setText:[temp objectAtIndex:indexPath.row]]; 

[temp removeAllObjects];
[temp release];
// Set up the cell...


return cell;
}


- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {


        [tableView deselectRowAtIndexPath:indexPath animated:YES];

        UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
        if (cell.accessoryType != UITableViewCellAccessoryCheckmark) {
            cell.accessoryType = UITableViewCellAccessoryCheckmark;
        }else {
            cell.accessoryType = UITableViewCellAccessoryNone;
        }
    }

Answer 1

Yes save the state of the row which is selected and in cellforrowatindexpath after you get the cell reset it to default state and check the state of the row and change the state.

EDIT:

You can create a NSMutabaleArray with number of items equal to the number of items in your datasource which is the name temp in your code.

On select you can actually change the value at that index to some text like @"selected" in the above created array.

In your cellforrowatindexpath you can check this text if its selected or unselected and then change the property of the cell. Its like maintaining a bitmap state for selected and unselected states.