title: UIscrollView swipe gesture + UIButton finger down effect on iOS
body: <p>I'm trying to come up with a UISCrollView in paging mode, where each page shows an image of a product and, besides being able to swipe between pages, I'd also like for the product image to switch to a "down" version of it when a specific product/page is tapped.</p>
  
  <p>So far I tried the following:</p>
  
  <p><strong>1 - adding UIButtons as the pages of the scrollview:</strong> obviously, this way I can have the images switch to their "Selected" version on finger down, but the buttons, taking up the whole page, prevent the scrollview from detecting the swipe gesture.</p>
  
  <p><strong>2 - adding UIVIews instead of buttons, and an UITapGestureRecognizer:</strong> this way I can tap an image to select a product and the recognizer also lets the gesture pass on to the scrollview, allowing for swiping too. But the problem with this approach is that I can't switch images to their "selected" versions when the user touches them, since the tap recognizer only reports UIGestureRecognizerStateEnded.</p>
  
  <p>Any ideas as to how to get both the button up/down and scrollview swipe behaviors?</p>