scrollview.addEventListener('doubletap',function(e)
{
    scrollview.zoomScale = 2.0;
});

2 Answers

• NOTE: scrollview have zoomScale, but scrollableview have not.

• If someone stumbles upon this question while trying to manage the double tap in a photo gallery…

  You have to build an array of scrollviews, each one with a maxZoomScale and containing an imageView.

  Then:

  scrollableView.addEventListener('doubletap', function(e)
  {
      var photo = scrollableView.views[scrollableView.currentPage];
      (photo.scale <= 1.0) ? photo.zoomScale = 2.0 : photo.zoomScale = 1.0;
  });
  

  Hope this helps somebody.