title: UITableViewHeaderView defaulting to hang over cell, not above
body: <p>I'm using UITableView's viewForHeaderInSection method, but I've decided the that the view would llook  nicer with a lowered opacity over the cell <em>by default</em>, where it starts like so:</p>
  
  <p><img src="https://imgur.com/M9DnrMu.png" alt="how it defaults"></p>
  
  <p>I'd like it to default like this, as if the user had already scrolled down (note, I want this for all cells, not just the one currently at the top of the view).</p>
  
  <p><img src="https://imgur.com/01rMrmP.png" alt="how i&#39;d like it"></p>
  
  <p>I could just add the view as a subview of the cell, except I want it to maintain the functionality where, if the cell is the top cell, the header view stays atop the screen. Maybe the proper way to do this is to not have a headerview, and if a cell is the top cell calculate where the view's origin.y on the cell - although this seems like a potentially expensive way to go about it, it may be the only / best.</p>
  
  <p>Thanks.</p>
  
  <p>PSI'm looking to do this in swift, but objective C would do. Thanks again</p>