Added sample project using networking and infinite scrolling and random cats

examples/CatDealsCollectionView/Sample/LoadingNode.m

@@ -0,0 +1,68 @@
+//
+//  LoadingNode.m
+//  Sample
+//
+//  Created by Samuel Stow on 1/9/16.
+//  Copyright © 2016 Facebook. All rights reserved.
+//
+
+#import "LoadingNode.h"
+#import <AsyncDisplayKit/ASDisplayNode+Subclasses.h>
+#import <AsyncDisplayKit/ASHighlightOverlayLayer.h>
+
+#import <AsyncDisplayKit/ASInsetLayoutSpec.h>
+#import <AsyncDisplayKit/ASCenterLayoutSpec.h>
+
+static CGFloat kFixedHeight = 200.0f;
+
+@interface LoadingNode ()
+{
+  ASDisplayNode *_loadingSpinner;
+}
+
+@end
+
+@implementation LoadingNode
+
+
+#pragma mark -
+#pragma mark ASCellNode.
+
++ (CGFloat)desiredHeightForWidth:(CGFloat)width {
+  return kFixedHeight;
+}
+
+- (instancetype)init
+{
+  if (!(self = [super init]))
+    return nil;
+  
+  _loadingSpinner = [[ASDisplayNode alloc] initWithViewBlock:^UIView * _Nonnull{
+    UIActivityIndicatorView *spinner = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
+    [spinner startAnimating];
+    return spinner;
+  }];
+  _loadingSpinner.preferredFrameSize = CGSizeMake(50, 50);
+  
+  
+  // add it as a subnode, and we're done
+  [self addSubnode:_loadingSpinner];
+  
+  return self;
+}
+
+- (void)layout {
+  [super layout];
+}
+
+- (ASLayoutSpec *)layoutSpecThatFits:(ASSizeRange)constrainedSize
+{
+  ASCenterLayoutSpec *centerSpec = [[ASCenterLayoutSpec alloc] init];
+  centerSpec.centeringOptions = ASCenterLayoutSpecCenteringXY;
+  centerSpec.sizingOptions = ASCenterLayoutSpecSizingOptionDefault;
+  centerSpec.child = _loadingSpinner;
+  
+  return centerSpec;
+}
+
+@end