From 2d26249cb0406cebab54d9980fd94a04a2b7ff13 Mon Sep 17 00:00:00 2001
From: Nadine Salter <nadi@fb.com>
Date: Mon, 20 Oct 2014 13:47:31 -0700
Subject: [PATCH] Add -didExitHierarchy internal hook.

---
 AsyncDisplayKit/ASDisplayNode.mm                | 7 +++++++
 AsyncDisplayKit/Private/ASDisplayNodeInternal.h | 1 +
 2 files changed, 8 insertions(+)

diff --git a/AsyncDisplayKit/ASDisplayNode.mm b/AsyncDisplayKit/ASDisplayNode.mm
index 1ed93f8182..1f41c17838 100644
--- a/AsyncDisplayKit/ASDisplayNode.mm
+++ b/AsyncDisplayKit/ASDisplayNode.mm
@@ -210,6 +210,11 @@ CGFloat ASDisplayNodeScreenScale()
   return YES;
 }
 
+- (void)__exitedHierarchy
+{
+
+}
+
 - (void)_loadViewOrLayerIsLayerBacked:(BOOL)isLayerBacked
 {
   ASDN::MutexLocker l(_propertyLock);
@@ -1116,6 +1121,8 @@ static NSInteger incrementIfFound(NSInteger i) {
   ASDisplayNodeAssertMainThread();
   ASDisplayNodeAssert(_flags.isInExitHierarchy, @"You should never call -didExitHierarchy directly. Appearance is automatically managed by ASDisplayNode");
   ASDisplayNodeAssert(!_flags.isInEnterHierarchy, @"ASDisplayNode inconsistency. __enterHierarchy and __exitHierarchy are mutually exclusive");
+
+  [self __exitedHierarchy];
 }
 
 - (void)reclaimMemory
diff --git a/AsyncDisplayKit/Private/ASDisplayNodeInternal.h b/AsyncDisplayKit/Private/ASDisplayNodeInternal.h
index fdc32e70c1..dd824c0de8 100644
--- a/AsyncDisplayKit/Private/ASDisplayNodeInternal.h
+++ b/AsyncDisplayKit/Private/ASDisplayNodeInternal.h
@@ -90,6 +90,7 @@ BOOL ASDisplayNodeSubclassOverridesSelector(Class subclass, SEL selector);
 // Swizzle to extend the builtin functionality with custom logic
 - (BOOL)__shouldLoadViewOrLayer;
 - (BOOL)__shouldSize;
+- (void)__exitedHierarchy;
 
 - (void)__layout;
 - (void)__setSupernode:(ASDisplayNode *)supernode;