From f96580de61e9c17b5691ebaf9bf4a8cdc77276d9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Konstantin=20K=C3=A4fer?= <mail@kkaefer.com>
Date: Fri, 8 May 2015 20:15:47 +0200
Subject: [PATCH] catch NaN values from UIPinchGestureRecognizer

---
 platform/ios/MGLMapView.mm | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/platform/ios/MGLMapView.mm b/platform/ios/MGLMapView.mm
index c0975051c..7488c366d 100644
--- a/platform/ios/MGLMapView.mm
+++ b/platform/ios/MGLMapView.mm
@@ -843,6 +843,11 @@ std::chrono::steady_clock::duration secondsAsDuration(float duration)
     else if (pinch.state == UIGestureRecognizerStateEnded || pinch.state == UIGestureRecognizerStateCancelled)
     {
         CGFloat velocity = pinch.velocity;
+        if (isnan(velocity))
+        {
+            // UIPinchGestureRecognizer sometimes returns NaN for the velocity
+            velocity = 0;
+        }
         if (velocity > -0.5 && velocity < 3)
         {
             velocity = 0;