From 0b554deb122b6291d45f415a987821c6b32b0987 Mon Sep 17 00:00:00 2001
From: Zhao Wang <zhao@playchat.net>
Date: Thu, 17 Dec 2015 15:38:42 -0800
Subject: [PATCH] resolve compile warning about variable never read

---
 Chatto/Source/ChatController/ChatCollectionViewLayout.swift | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Chatto/Source/ChatController/ChatCollectionViewLayout.swift b/Chatto/Source/ChatController/ChatCollectionViewLayout.swift
index d6c2219..3a0a811 100644
--- a/Chatto/Source/ChatController/ChatCollectionViewLayout.swift
+++ b/Chatto/Source/ChatController/ChatCollectionViewLayout.swift
@@ -84,7 +84,10 @@ public class ChatCollectionViewLayout: UICollectionViewLayout {
         dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)) { () -> Void in
             // Dealloc of layout with 5000 items take 25 ms on tests on iPhone 4s
             // This moves dealloc out of main thread
-            oldLayoutModel = nil
+            if oldLayoutModel != nil {
+                // Use nil check above to remove compiler warning: Variable 'oldLayoutModel' was written to, but never read
+                oldLayoutModel = nil
+            }
         }
     }