From 3512cf47aa9b9f509c26528173a85626dccfce7f Mon Sep 17 00:00:00 2001
From: ricky <rickycancro@gmail.com>
Date: Thu, 7 Jul 2016 10:21:16 -0700
Subject: [PATCH] assert we are on the main thread before accessing view.

---
 AsyncDisplayKit/ASViewController.mm | 1 +
 1 file changed, 1 insertion(+)

diff --git a/AsyncDisplayKit/ASViewController.mm b/AsyncDisplayKit/ASViewController.mm
index deffec60..3b0af2d2 100644
--- a/AsyncDisplayKit/ASViewController.mm
+++ b/AsyncDisplayKit/ASViewController.mm
@@ -195,6 +195,7 @@ ASVisibilityDepthImplementation;
     return [asyncTraitCollection environmentTraitCollection];
   }
   
+  ASDisplayNodeAssertMainThread();
   ASEnvironmentTraitCollection asyncTraitCollection = ASEnvironmentTraitCollectionFromUITraitCollection(traitCollection);
   asyncTraitCollection.containerWindowSize = self.view.frame.size;
   return asyncTraitCollection;