title: background color of uiactionsheet
body: <p>I try to change the background color of my actionsheet, I just use the method:</p>
  
  <p>[actionSheet setBackgroundColor:[UIColor colorWithRed:30 green:30 blue:30 alpha:0.5]];</p>
  
  <p>and I put it in the willPresentActionSheet. But the background color don't change, why?</p>