title: How to make semi-transparent UITableViewCells?
body: <p>I hope to add image to cell background and from the semi transparent cell I could see the backgroud of tableview.</p>
  
  <p>From following topic, I know how to make transparent cell.</p>
  
  <p><a href="https://stackoverflow.com/questions/1501959/uitableviewcell-transparent-background-including-imageview-accessoryview">UITableViewCell transparent background (including imageView/accessoryView)</a> </p>
  
  <p>I've tried above, it did work. But when I add the following code:</p>
  
  <pre><code>UIView *backView = [[[UIView alloc] initWithFrame:CGRectZero] autorelease];
  backView.backgroundColor = [UIColor colorWithRed:.1 green:.1 blue:.1 alpha: .4];
  cell.backgroundView = backView;
  </code></pre>
  
  <p>The cell became grey color without any transparency, if I change code as follows,</p>
  
  <pre><code>UIView *backView = [[UIView alloc] initWithFrame:CGRectZero];
  backView.backgroundColor = [UIColor clearColor];
  cell.backgroundView = backView;
  </code></pre>
  
  <p>The cell became white, still without any transparency.</p>
  
  <p>Is there one can give me any clues?</p>