Hide position: fixed; elements after pinch zoom.

iOSZoomDetect.js

//Copyright 2013 NAOTONE
//Please use under MIT license.
  jQuery(window).resize(function() {
    iOSClearFixed();
  });

  jQuery('html').on("touchend", touchHandler);

  touchHandler = function(event) {
    return iOSClearFixed;
  };

  iOSClearFixed = function() {
    var zoom;
    zoom = document.documentElement.clientWidth - window.innerWidth;
    if (zoom >= 80) {
      return jQuery(".fixed").css("z-index", -1);
    } else{
      return jQuery(".fixed").css("z-index", 10);
    }
  };