From b15ec53a03fc718c222ea60afc5c8930be6b0fd6 Mon Sep 17 00:00:00 2001
From: Elias Naur <mail@eliasnaur.com>
Date: Wed, 3 Apr 2019 13:13:53 +0200
Subject: [PATCH] ui/app: fix display link on iOS 10

For some reason, the CADisplayLink.paused property didn't work on
iOS 10 but does on iOS 12. Use addToRunLoop and removeFromRunLoop
instead.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
---
 ui/app/os_ios.m | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/ui/app/os_ios.m b/ui/app/os_ios.m
index 1acb0380..6eda6364 100644
--- a/ui/app/os_ios.m
+++ b/ui/app/os_ios.m
@@ -129,9 +129,6 @@ NSArray<UIKeyCommand *> *_keyCommands;
 	if (self) {
 		__weak id weakSelf = self;
 		displayLink = [CADisplayLink displayLinkWithTarget:weakSelf selector:@selector(onFrameCallback:)];
-		displayLink.paused = YES;
-		NSRunLoop *runLoop = [NSRunLoop currentRunLoop];
-		[displayLink addToRunLoop:runLoop forMode:[runLoop currentMode]];
 	}
 	return self;
 }
@@ -141,7 +138,12 @@ NSArray<UIKeyCommand *> *_keyCommands;
 }
 
 - (void)setAnimating:(BOOL)anim {
-	displayLink.paused = !anim;
+	NSRunLoop *runLoop = [NSRunLoop currentRunLoop];
+	if (anim) {
+		[displayLink addToRunLoop:runLoop forMode:[runLoop currentMode]];
+	} else {
+		[displayLink removeFromRunLoop:runLoop forMode:[runLoop currentMode]];
+	}
 }
 
 - (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {