From 9c5b2f6cc653a740801cdbbc1d4eb4c045f363e2 Mon Sep 17 00:00:00 2001
From: Fabian Guerra <fabian.guerra@mapbox.com>
Date: Tue, 10 Sep 2019 16:34:35 -0700
Subject: [PATCH] [ios] Add an assert to test if the timer runs on the main
 thread.

---
 Examples/ObjectiveC/AnimatedLineExample.m | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Examples/ObjectiveC/AnimatedLineExample.m b/Examples/ObjectiveC/AnimatedLineExample.m
index 4694bef3..baceae9b 100644
--- a/Examples/ObjectiveC/AnimatedLineExample.m
+++ b/Examples/ObjectiveC/AnimatedLineExample.m
@@ -63,6 +63,7 @@ - (void)animatePolyline {
 }
 
 - (void)tick:(NSTimer*)timer {
+    NSAssert([[NSThread currentThread] isMainThread], @"%s must be accessed on the main thread, not %@", __PRETTY_FUNCTION__, [NSThread currentThread]);
     if (self.currentIndex > self.locations.count) {
         [self.timer invalidate];
         return;