title: UIPickerView inside an action sheet is not responsive from bottom half
body: <p>I created a <code>UIPickerView</code> inside an <code>UIActionSheet</code>, using the following tutorial:
  <a href="https://stackoverflow.com/questions/1262574/add-uipickerview-a-button-in-action-sheet-how">Add UIPickerView &amp; a Button in Action sheet - How?</a></p>
  
  <p>I've noticed that the <code>UIPickerView</code> does not respond to touches below the bottom half of the <code>UIPicker</code>.  Perhaps <i>just</i> below the selection bar, but not any more below.  </p>
  
  <p>Has anyone had any similar experiences and resolved them?</p>