diff --git a/CHANGELOG.md b/CHANGELOG.md
index 714b1f9d12..e9752ddbda 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,6 @@
 ## master
 * Add your own contributions to the next release on the line below this with your name.
+- [Breaking][ASDisplayNode] Make interface state delegate protocol required. [Max Wang](https://github.com/wsdwsd0829). [#1112](https://github.com/TextureGroup/Texture/pull/1112)
 - [ASCollectionView] Fix reording of cells manually for iOS 9 & 10. [Max Wang](https://github.com/wsdwsd0829). [#1081](https://github.com/TextureGroup/Texture/pull/1081)
 - [ASDisplayNode] Allow add/remove interface state delegates on background thread. [Max Wang](https://github.com/wsdwsd0829). [#1090](https://github.com/TextureGroup/Texture/pull/1090)
 - [License] Simplify the Texture license to be pure Apache 2 (removing ASDK-Licenses).[Scott Goodson](https://github.com/appleguy) [#1077](https://github.com/TextureGroup/Texture/pull/1077) 
diff --git a/Source/ASDisplayNode+InterfaceState.h b/Source/ASDisplayNode+InterfaceState.h
index cca1e4e729..ec4414bb77 100644
--- a/Source/ASDisplayNode+InterfaceState.h
+++ b/Source/ASDisplayNode+InterfaceState.h
@@ -40,7 +40,6 @@ typedef NS_OPTIONS(NSUInteger, ASInterfaceState)
 };
 
 @protocol ASInterfaceStateDelegate <NSObject>
-@optional
 
 /**
  * @abstract Called whenever any bit in the ASInterfaceState bitfield is changed.
diff --git a/Source/ASDisplayNode.mm b/Source/ASDisplayNode.mm
index 2cf3438a6e..c3d914671e 100644
--- a/Source/ASDisplayNode.mm
+++ b/Source/ASDisplayNode.mm
@@ -460,9 +460,7 @@ ASSynthesizeLockingMethodsWithMutex(__instanceLock__);
     } \
     __instanceLock__.unlock(); \
     for (id <ASInterfaceStateDelegate> delegate in delegates) { \
-      if ([delegate respondsToSelector:@selector(method)]) { \
-        [delegate method]; \
-      } \
+      [delegate method]; \
     }
 
 - (BOOL)_locked_shouldLoadViewOrLayer
@@ -3220,9 +3218,7 @@ ASDISPLAYNODE_INLINE BOOL subtreeIsRasterized(ASDisplayNode *node) {
   NSHashTable *delegates = [_interfaceStateDelegates copy];
   __instanceLock__.unlock();
   for (id <ASInterfaceStateDelegate> delegate in delegates) {
-    if ([delegate respondsToSelector:@selector(interfaceStateDidChange:fromState:)]) {
-      [delegate interfaceStateDidChange:newState fromState:oldState];
-    }
+    [delegate interfaceStateDidChange:newState fromState:oldState];
   }
 }
 
diff --git a/Source/ASNodeController+Beta.h b/Source/ASNodeController+Beta.h
index 7c00ba8fed..e5bcc29622 100644
--- a/Source/ASNodeController+Beta.h
+++ b/Source/ASNodeController+Beta.h
@@ -38,6 +38,8 @@
 - (void)interfaceStateDidChange:(ASInterfaceState)newState
                       fromState:(ASInterfaceState)oldState ASDISPLAYNODE_REQUIRES_SUPER;
 
+- (void)hierarchyDisplayDidFinish ASDISPLAYNODE_REQUIRES_SUPER;
+
 @end
 
 @interface ASDisplayNode (ASNodeController)
diff --git a/Source/ASNodeController+Beta.mm b/Source/ASNodeController+Beta.mm
index 77199b25f6..201b3cfb93 100644
--- a/Source/ASNodeController+Beta.mm
+++ b/Source/ASNodeController+Beta.mm
@@ -80,6 +80,8 @@
 - (void)interfaceStateDidChange:(ASInterfaceState)newState
                       fromState:(ASInterfaceState)oldState {}
 
+- (void)hierarchyDisplayDidFinish {}
+
 @end
 
 @implementation ASDisplayNode (ASNodeController)