[Examples, Build] Moving some smaller / less useful examples to a separate directory, speeding up builds.

examples_extra/CollectionViewWithViewControllerCells/Sample/SupplementaryNode.m

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+/* This file provided by Facebook is for non-commercial testing and evaluation
+ * purposes only.  Facebook reserves all rights not expressly granted.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * FACEBOOK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#import "SupplementaryNode.h"
+
+#import <AsyncDisplayKit/ASDisplayNode+Subclasses.h>
+#import <AsyncDisplayKit/ASInsetLayoutSpec.h>
+#import <AsyncDisplayKit/ASCenterLayoutSpec.h>
+
+@implementation SupplementaryNode {
+  ASTextNode *_textNode;
+}
+
+- (instancetype)initWithText:(NSString *)text
+{
+  self = [super init];
+  if (self != nil) {
+    _textNode = [[ASTextNode alloc] init];
+    _textNode.attributedString = [[NSAttributedString alloc] initWithString:text
+                                                                 attributes:[self textAttributes]];
+    [self addSubnode:_textNode];
+  }
+  return self;
+}
+
+- (ASLayoutSpec *)layoutSpecThatFits:(ASSizeRange)constrainedSize
+{
+  ASCenterLayoutSpec *center = [[ASCenterLayoutSpec alloc] init];
+  center.centeringOptions = ASCenterLayoutSpecCenteringY;
+  center.child = _textNode;
+  return center;
+}
+
+#pragma mark - Text Formatting
+
+- (NSDictionary *)textAttributes
+{
+  return @{
+    NSFontAttributeName: [UIFont preferredFontForTextStyle:UIFontTextStyleHeadline],
+    NSForegroundColorAttributeName: [UIColor grayColor],
+  };
+}
+
+@end