title: UITableView reloadData crash
body: <p>I added CustomImageView to the UITableViewCell. </p>
  
  <pre><code>    UITableViewCell *cell = nil;
      if (cell == nil) {
           cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault  reuseIdentifier:@"Cell1"] autorelease];
      }
      CustomImageView *customIV = [[CustomImageView alloc] init];
      [cell.contentView addSubView:customIV];
      [customIV release];
  </code></pre>
  
  <p>But when I try to reload tableview, the error occurs.</p>
  
  <p>error call stack is same as follows.</p>
  
  <p><img src="https://i.stack.imgur.com/dxoSl.png" alt="enter image description here"></p>
  
  <p>Output string is as follows.</p>
  
  <blockquote>
    <p>-[CustomImageView superview]: message sent to deallocated instance 0x1f848f30</p>
  </blockquote>