accessoryTypeCheckmark dissapears when UITableViewCell is hidden

I'm creating a function to keep track on deadlines. When you select a row in the deadline table view I change the accessoryType to Checkmark. This works perfectly with this code:

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

    if (selectedCell.accessoryType == UITableViewCellAccessoryNone) {
        [Deadline setDone: TRUE onIndex:indexPath.row];
        selectedCell.accessoryType = UITableViewCellAccessoryCheckmark;

    } else {
        [Deadline setDone: FALSE onIndex:indexPath.row];
        selectedCell.accessoryType = UITableViewCellAccessoryNone;
    }

    [tableView deselectRowAtIndexPath:indexPath animated: YES];
}

The problem occurs when you have selected a table cell and the scrolled so it dissappears, when it appears again the accessoryType is None again.

My code for deciding accessoryType in cellForRowAtIndexPath is:

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 
{
    static NSString *CellIdentifier = @"CellIdentifier";

    Deadline *d = [self.arrDeadlines objectAtIndex:indexPath.row];

    Cell *currCell = (Cell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
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    if (currCell == nil) 
    {
        UIViewController *c = [[UIViewController alloc] initWithNibName:@"Cell" bundle:nil];
        currCell = (Cell *)c.view;
        [c release];        
    }

    currCell.lblTitle.text = d.name;    

    currCell.accessoryType = d.done == TRUE ? UITableViewCellAccessoryCheckmark : UITableViewCellAccessoryNone;

    return currCell;
}

How do I solve this?

You should not use a TableViewCell to keep data. This is where your dataSource is for, the TableViewCell is just a visible representation of the data in your dataSource.

Since cell are reused after they are no longer displayed all data gets reset.

Thus in your UItableViewDataSoucre you should check whether a task is done and set the accessoryType yo the checkmark.

So add an NSLog in the cellForIndexPath method and check whether the done boolean is really set.