Question

I am using a UITableView and I’m noticing that the cells in my tableview are getting progresively bolder as I scroll, it is overwriting the contents and I want to stop this but can’t see where I’m going wrong.

On my UITableView, for some reason when I scroll the contents of the tableview get messed up with the the manually created UILabel.

I require a manual UILabel because I need to have custom cells later on.

As I scroll up and down, the labels get progressively bolder and bolder; they always overlap and sometimes even affects rows lower down (even before they are in the viewport).

If I keep doing it, the cell contents become unintelligable.

This only happens if there the backgroundColor is not set as clearColor.

I have attempted [cellLabel setClearsContextBeforeDrawing:YES]; and [self.tableView setClearsContextBeforeDrawing:YES]; to no effect.

If I use cell.textLabel.text then the problem seems to go away.

Code and an image sample follows.

  // Simple table view
    - (UITableViewCell *)tableView:(UITableView *)tv cellForRowAtIndexPath:(NSIndexPath *)indexPath 
    {
        static NSString *CellIdentifier = @"Cell";

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

        // Configure the cell...
        //[self configureCell:cell atIndexPath:indexPath];


        NSString *txt = @"Product";


        //cell.textLabel.text = txt;
        cell.selectionStyle = UITableViewCellSelectionStyleNone;

        UIView *cellView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 200, cell.frame.size.height)];

        UILabel *cellLabel = [[UILabel alloc] initWithFrame:CGRectMake(20, 10, 120, 35)];
        [cellLabel setText:txt];
        [cellLabel setFont:[UIFont boldSystemFontOfSize:12]];
        [cellLabel setBackgroundColor:[UIColor clearColor]];

        [cellView addSubview:cellLabel];
        [cellLabel release];
        [cell.contentView addSubview:cellView];
        [cellView release];


        return cell;
    }


Image follows;


![image of uitableview][1]


  [1]: https://i.stack.imgur.com/5lNy6.png


// Edit to include context

I am using a dictionary to display the contents of the UITableViewCells.

I have attempted to do the following;

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

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

            [self configureCell:cell atIndexPath:indexPath];
        } // end if


        // Configure the cell...
        //
       // Moved to inside the cell==nil        

        return cell;
    }

-(void)configureCell:(UITableViewCell *)cell atIndexPath:(NSIndexPath *)indexPath
{

    // Get the txt from the Dictionary/Plist... *removed due verboseness*

    UILabel *cellLabel = [[UILabel alloc] initWithFrame:CGRectMake(20, 10, 120, 35)];
    [cellLabel setText:txt];
    [cellLabel setFont:[UIFont boldSystemFontOfSize:12]];
    [cellLabel setBackgroundColor:[UIColor clearColor]];

    [cell.contentView addSubview:cellLabel];
    [cellLabel release];
}

This, although it fixes the problem of overwriting — it causes a problem — it makes labels repeatedly appear in totally random places — the following is just an example, other fields and labels also repeat.

See picture below;

Answer 1

    // cell reuse
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

returned you the cell already been used, it already has an UILabel subview and you are adding another over it. Put the adding subviews at the section

   if (cell == nil) { //cell initialization

and edit the subviews as needed after the cell initialization, you can access them by tag for example.