[Examples] 2.0 Collection/Table API updates (#2390)

* update VerticalWithinHorizontal example

* update SocialAppLayout

* update Kittens

* update HorizontalWithinVerticalScrolling

* update AsyncDisplayKitOverview

* update CustomCollectionView

* CatDealsCollectionView

* update Swift

* address @appleguy's comment

* updates for tableNode deselectRowAtIndexPath

examples/HorizontalWithinVerticalScrolling/Sample/HorizontalScrollCellNode.mm

@@ -39,6 +39,8 @@ static const CGFloat kInnerPadding = 10.0f;
 
 @implementation HorizontalScrollCellNode
 
+#pragma mark - Lifecycle
+
 - (instancetype)initWithElementSize:(CGSize)size
 {
   if (!(self = [super init]))
@@ -46,11 +48,16 @@ static const CGFloat kInnerPadding = 10.0f;
 
   _elementSize = size;
 
+  // the containing table uses -nodeForRowAtIndexPath (rather than -nodeBlockForRowAtIndexPath),
+  // so this init method will always be run on the main thread (thus it is safe to do UIKit things).
   UICollectionViewFlowLayout *flowLayout = [[UICollectionViewFlowLayout alloc] init];
   flowLayout.scrollDirection = UICollectionViewScrollDirectionHorizontal;
   flowLayout.itemSize = _elementSize;
   flowLayout.minimumInteritemSpacing = kInnerPadding;
+  
   _collectionNode = [[ASCollectionNode alloc] initWithCollectionViewLayout:flowLayout];
+  _collectionNode.delegate = self;
+  _collectionNode.dataSource = self;
   [self addSubnode:_collectionNode];
   
   // hairline cell separator
@@ -61,40 +68,6 @@ static const CGFloat kInnerPadding = 10.0f;
   return self;
 }
 
-- (void)didLoad
-{
-  [super didLoad];
-  
-  _collectionNode.view.asyncDelegate = self;
-  _collectionNode.view.asyncDataSource = self;
-}
-
-- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
-{
-  return 5;
-}
-
-- (ASCellNodeBlock)collectionView:(ASCollectionView *)collectionView nodeBlockForItemAtIndexPath:(NSIndexPath *)indexPath
-{
-  CGSize elementSize = _elementSize;
-  return ^{
-    RandomCoreGraphicsNode *elementNode = [[RandomCoreGraphicsNode alloc] init];
-    elementNode.style.preferredSize = elementSize;
-    return elementNode;
-  };
-}
-
-- (ASLayoutSpec *)layoutSpecThatFits:(ASSizeRange)constrainedSize
-{
-  CGSize collectionNodeSize = CGSizeMake(constrainedSize.max.width, _elementSize.height);
-  _collectionNode.style.preferredSize = collectionNodeSize;
-  
-  ASInsetLayoutSpec *insetSpec = [[ASInsetLayoutSpec alloc] init];
-  insetSpec.insets = UIEdgeInsetsMake(kOuterPadding, 0.0, kOuterPadding, 0.0);
-  insetSpec.child = _collectionNode;
-  return insetSpec;
-}
-
 // With box model, you don't need to override this method, unless you want to add custom logic.
 - (void)layout
 {
@@ -107,4 +80,34 @@ static const CGFloat kInnerPadding = 10.0f;
   _divider.frame = CGRectMake(0.0f, 0.0f, self.calculatedSize.width, pixelHeight);
 }
 
+- (ASLayoutSpec *)layoutSpecThatFits:(ASSizeRange)constrainedSize
+{
+  CGSize collectionNodeSize = CGSizeMake(constrainedSize.max.width, _elementSize.height);
+  _collectionNode.style.preferredSize = collectionNodeSize;
+  
+  ASInsetLayoutSpec *insetSpec = [[ASInsetLayoutSpec alloc] init];
+  insetSpec.insets = UIEdgeInsetsMake(kOuterPadding, 0.0, kOuterPadding, 0.0);
+  insetSpec.child = _collectionNode;
+  
+  return insetSpec;
+}
+
+#pragma mark - ASCollectionNode
+
+- (NSInteger)collectionNode:(ASCollectionNode *)collectionNode numberOfItemsInSection:(NSInteger)section
+{
+  return 5;
+}
+
+- (ASCellNodeBlock)collectionNode:(ASCollectionNode *)collectionNode nodeBlockForItemAtIndexPath:(NSIndexPath *)indexPath
+{
+  CGSize elementSize = _elementSize;
+  
+  return ^{
+    RandomCoreGraphicsNode *elementNode = [[RandomCoreGraphicsNode alloc] init];
+    elementNode.style.preferredSize = elementSize;
+    return elementNode;
+  };
+}
+
 @end