From e34d529620d3f69515cacfe836c148e086740f97 Mon Sep 17 00:00:00 2001
From: Matthew Chen <charlesmchen@gmail.com>
Date: Fri, 3 Feb 2017 12:28:11 -0500
Subject: [PATCH] Prevent system edge swipe gestures from showing/hiding call
 controls.

// FREEBIE
---
 Signal/src/views/OWSAnyTouchGestureRecognizer.m | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/Signal/src/views/OWSAnyTouchGestureRecognizer.m b/Signal/src/views/OWSAnyTouchGestureRecognizer.m
index 228710152..3e4d7b827 100644
--- a/Signal/src/views/OWSAnyTouchGestureRecognizer.m
+++ b/Signal/src/views/OWSAnyTouchGestureRecognizer.m
@@ -57,6 +57,16 @@
         return NO;
     }
 
+    // Ignore touches that start near the top or bottom edge of the screen;
+    // they may be a system edge swipe gesture.
+    CGFloat distanceToTopEdge = MAX(0, location.y);
+    CGFloat distanceToBottomEdge = MAX(0, self.view.bounds.size.height - location.y);
+    CGFloat distanceToNearestEdge = MIN(distanceToTopEdge, distanceToBottomEdge);
+    CGFloat kSystemEdgeSwipeTolerance = 50.f;
+    if (distanceToNearestEdge < kSystemEdgeSwipeTolerance) {
+        return NO;
+    }
+
     return YES;
 }