title: topLayoutGuide in child view controller
body: <p>I have a <code>UIPageViewController</code> with translucent status bar and navigation bar. Its <code>topLayoutGuide</code> is 64 pixels, as expected.</p>
  
  <p>However, the child view controllers of the <code>UIPageViewController</code> report a <code>topLayoutGuide</code> of 0 pixels, even if they're shown under the status bar and navigation bar. </p>
  
  <p>Is this the expected behavior? If so, what's the best way to position a view of a child view controller under the real <code>topLayoutGuide</code>?</p>
  
  <p>(short of using <code>parentViewController.topLayoutGuide</code>, which I'd consider a hack)</p>