title: Make tableView subView scroll with the tableView
body: <p>I have an imageView as a subView of a tableView that I would like to always be in the background of the tableView even when the tableView is scrolled down. The way I have it now, i'm assuming because the imageView frame is fixed to the tableView frame, when I scroll down the tableView then end of the image is reached and it just shows the background color of the tableView. </p>
  
  <p>My code:</p>
  
  <pre><code>        let imageView: UIImageView = UIImageView(image: background)
          imageView.frame = CGRectMake(0, 0, view.bounds.width, view.bounds.height)
          let darkBlur = UIBlurEffect(style: UIBlurEffectStyle.Dark)
          let blurView = UIVisualEffectView(effect: darkBlur)
          blurView.frame = imageView.frame
          imageView.addSubview(blurView)
          self.tableView.insertSubview(imageView, atIndex: 0)
  </code></pre>