Add 'submodules/AsyncDisplayKit/' from commit '02bedc12816e251ad71777f9d2578329b6d2bef6'

git-subtree-dir: submodules/AsyncDisplayKit
git-subtree-mainline: d06f423e0e
git-subtree-split: 02bedc1281

submodules/AsyncDisplayKit/examples/ASCollectionView/Sample/SupplementaryNode.m

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+//
+//  SupplementaryNode.m
+//  Texture
+//
+//  Copyright (c) Facebook, Inc. and its affiliates.  All rights reserved.
+//  Changes after 4/13/2017 are: Copyright (c) Pinterest, Inc.  All rights reserved.
+//  Licensed under Apache 2.0: http://www.apache.org/licenses/LICENSE-2.0
+//
+
+#import "SupplementaryNode.h"
+
+#import <AsyncDisplayKit/ASDisplayNode+Subclasses.h>
+#import <AsyncDisplayKit/ASInsetLayoutSpec.h>
+#import <AsyncDisplayKit/ASCenterLayoutSpec.h>
+
+static CGFloat kInsets = 15.0;
+
+@interface SupplementaryNode ()
+@property (nonatomic, strong) ASTextNode *textNode;
+@end
+
+@implementation SupplementaryNode
+
+- (instancetype)initWithText:(NSString *)text
+{
+  self = [super init];
+  
+  if (self != nil) {
+    _textNode = [[ASTextNode alloc] init];
+    _textNode.attributedText = [[NSAttributedString alloc] initWithString:text
+                                                                 attributes:[self textAttributes]];
+    [self addSubnode:_textNode];
+  }
+  
+  return self;
+}
+
+- (ASLayoutSpec *)layoutSpecThatFits:(ASSizeRange)constrainedSize
+{
+  ASCenterLayoutSpec *center = [[ASCenterLayoutSpec alloc] init];
+  center.centeringOptions = ASCenterLayoutSpecCenteringXY;
+  center.child = self.textNode;
+  UIEdgeInsets insets = UIEdgeInsetsMake(kInsets, kInsets, kInsets, kInsets);
+  
+  return [ASInsetLayoutSpec insetLayoutSpecWithInsets:insets child:center];
+}
+
+#pragma mark - Text Formatting
+
+- (NSDictionary *)textAttributes
+{
+  return @{
+    NSFontAttributeName: [UIFont systemFontOfSize:18.0],
+    NSForegroundColorAttributeName: [UIColor whiteColor],
+  };
+}
+
+@end