title: UIScrollView made in storyboard has frame value of zero
body: <p>I made a scrollview in my storyboard which contains severals <code>UIImageView</code>.</p>
  
  <p>The problem is, the frame of that scrollview is equal to <code>{0, 0, 0, 0}</code> and I don't know why. The scrollview is visible on my screen, but I'm not able to scroll it.</p>
  
  <p>I already try to set a content size, and a frame, but without success.</p>