title: Cells become empty after scrolling. (Xcode)
body: <p>I have a problem with my tableview. When I scroll and a cell disappears from the screen it becomes blank. I have built a prototype cell in the storyboard with two labels and one imageview, it have the same identifier that I use in my code. I also have built a custom class for the customcell. Here is the code in cellForRowAtIndexPath:</p>
  
  <pre><code>- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
  {
  
  static NSString *CellIdentifier = @"Cell";
  Scientist *currentScientist = [[xmlParser data] objectAtIndex:indexPath.row];
  
  CustomCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
  if (cell == nil)
  {
      cell = [[CustomCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
  
  }
  
  cell.self.cellName.text = currentScientist.self.name;
  cell.self.cellSubject.text = currentScientist.self.subject;
  cell.self.cellImage.image = currentScientist.self.image;
  
  return cell;
  }
  </code></pre>
  
  <p>I don't know if you need more code to help me. </p>