UIView showing up in a UITableView section it was never added to when scrolling

Question

I've got a UIView that I'm adding to a cell's content view in a particular section (Section 1 specifically), as shown below:

[cell.contentView addSubview:self.overallCommentViewContainer];

When I quickly scroll up/down - the UIView appears in Section 0 - even though I never added the UIView to any of the cell's in Section 0.

Here's a detailed look at my cellForRowAtIndexPath method:

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

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:kCustomCellID];
    if (cell == nil)
    {
     cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:kCustomCellID] autorelease];
    }

    // Configure the cell.
    switch(indexPath.section) {

     case 0: 
      // other code
      break;
     case 1:  

      // add the overall comment view container to the cell
      NLog(@"adding the overallCommentViewContainer");
      [cell.contentView addSubview:self.overallCommentViewContainer];
      NLog(@"creating the row at: Section %d, Row %d", indexPath.section, indexPath.row);
      break;
    }
    return cell;
}

Answer 1

Hi Cole, if the UITableView has cells ready for reuse, its dequeueReusableCellWithIdentifier method will happily return a cell for section 0 that was originally used in section 1! I'd recommend something like this for you to keep them separate:

UITableViewCell *cell;

// Configure the cell.
switch(indexPath.section) {

 case 0: 
  cell = [tableView dequeueReusableCellWithIdentifier:@"Section0Cell"];
  if (cell == nil) {
   cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:@"Section0Cell"] autorelease];
  }
  // other code
  break;
 case 1:  
  cell = [tableView dequeueReusableCellWithIdentifier:@"Section1Cell"];
  if (cell == nil) {
   cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:@"Section1Cell"] autorelease];
   // add the overall comment view container to the cell
   NLog(@"adding the overallCommentViewContainer");
   [cell.contentView addSubview:self.overallCommentViewContainer];
  }
  NLog(@"creating the row at: Section %d, Row %d", indexPath.section, indexPath.row);
  break;
}
return cell;

The key is to use a different identifier string for each type of cell you're using that is not interchangeable with other cells in the table.