how to apply check mark on table view in iphone using objective c?

Question

i m trying for apply for check mark in table view, but it is not working, if i checked again at that cell again then check mark apply. but not apply at new selected cell. a

Answer 1

There is a funny bug here

 if (row != oldRow)

because if oldRow was nil (or in another words... "0" ;-) and the user press the row = "0" the "if" sentence will think this row was checked.

I fixed like this:

- (void) tableView:(UITableView *) tableView didSelectRowAtIndexPath:(NSIndexPath *) indexPath
{
    if (!self.lastIndexPath) {
        self.lastIndexPath = indexPath;
    }

    if ([self.lastIndexPath row] != [indexPath row])
    {
        UITableViewCell *newCell = [tableView cellForRowAtIndexPath: indexPath];
        newCell.accessoryType = UITableViewCellAccessoryCheckmark;

        UITableViewCell *oldCell = [tableView cellForRowAtIndexPath:self.lastIndexPath]; 
        oldCell.accessoryType = UITableViewCellAccessoryNone;

        self.lastIndexPath = indexPath;  
    }
    else {
        UITableViewCell *newCell = [tableView cellForRowAtIndexPath: indexPath];
        newCell.accessoryType = UITableViewCellAccessoryCheckmark;
    }

    [tableView deselectRowAtIndexPath:indexPath animated:YES];
}

By the way... dont forget to use "self"

Answer 2

Do you mean that the checkmark doesn't apply when you choose the first line at the first time? You can add an else sentence to the code, but it wastes some time when running the code.

if (newRow != oldRow)
{
    UITableViewCell *newCell = [tableView cellForRowAtIndexPath:indexPath];
    newCell.accessoryType = UITableViewCellAccessoryCheckmark;

    UITableViewCell *oldCell = [tableView cellForRowAtIndexPath: lastIndexPath]; 
    oldCell.accessoryType = UITableViewCellAccessoryNone;

    lastIndexPath = indexPath;  
}
else
{
    UITableViewCell *newCell = [tableView cellForRowAtIndexPath:indexPath];
    newCell.accessoryType = UITableViewCellAccessoryCheckmark;
    lastIndexPath = indexPath;
}