From a0b0dff6fdbdc4be78087aa572f3da5dbb8daa01 Mon Sep 17 00:00:00 2001
From: BastiaanOlij <mux213@gmail.com>
Date: Tue, 21 Mar 2017 23:50:53 +1100
Subject: [PATCH] Fixing magnetometer on iOS

(cherry picked from commit 4b7d1d8c15747a552b7dff52b0eeda4d3e7cec4e)
---
 platform/iphone/app_delegate.mm | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/platform/iphone/app_delegate.mm b/platform/iphone/app_delegate.mm
index 00bb4b9fada..e82649692cf 100644
--- a/platform/iphone/app_delegate.mm
+++ b/platform/iphone/app_delegate.mm
@@ -299,8 +299,8 @@ static int frame_count = 0;
 	if (!motionInitialised) {
 		motionManager = [[CMMotionManager alloc] init];
 		if (motionManager.deviceMotionAvailable) {
-      motionManager.deviceMotionUpdateInterval = 1.0/70.0;
-      [motionManager startDeviceMotionUpdates];			
+			motionManager.deviceMotionUpdateInterval = 1.0/70.0;
+                        [motionManager startDeviceMotionUpdatesUsingReferenceFrame:CMAttitudeReferenceFrameXMagneticNorthZVertical];
 			motionInitialised = YES;
 		};
 	};