From 1edbe75bf8d72023e639cff788c9c04df5c4d936 Mon Sep 17 00:00:00 2001
From: Vincent Vanwaelscappel <vincent@cubedesigners.com>
Date: Wed, 28 Jun 2017 19:33:56 +0200
Subject: [PATCH] #1471

---
 js/libs/fluidbook/fluidbook.touch.js | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/js/libs/fluidbook/fluidbook.touch.js b/js/libs/fluidbook/fluidbook.touch.js
index ac1b824e..85a2d464 100644
--- a/js/libs/fluidbook/fluidbook.touch.js
+++ b/js/libs/fluidbook/fluidbook.touch.js
@@ -17,12 +17,16 @@ FluidbookTouch.prototype = {
     init: function () {
         var $this = this;
 
-        // Disable native zoom
-        document.addEventListener('touchmove', function (event) {
-            if (event.scale !== 1) {
-                event.preventDefault();
-            }
-        }, false);
+        // Disable native zoom #1471
+        if (this.fluidbook.support.iOS) {
+            document.addEventListener('touchmove', function (event) {
+                event = event.originalEvent || event;
+                if (event.scale != undefined && event.scale !== 1) {
+                    event.preventDefault();
+                }
+            }, false);
+        }
+
 
         $(this.fluidbook).on('fluidbook.page.change.end', function () {
             $this.resetSlide();
-- 
2.39.5