Add ASViewController and update Multiplex sample to use it.

2025-12-24 07:05:35 +00:00 · 2015-09-16 22:22:08 +03:00
parent 21bdbbe12f
commit 07c0d78c71
9 changed files with 270 additions and 143 deletions
--- a/AsyncDisplayKit.xcodeproj/project.pbxproj
+++ b/AsyncDisplayKit.xcodeproj/project.pbxproj
@@ -230,6 +230,8 @@
 		AC47D9451B3BB41900AAEE9D /* ASRelativeSize.h in Headers */ = {isa = PBXBuildFile; fileRef = AC47D9431B3BB41900AAEE9D /* ASRelativeSize.h */; settings = {ATTRIBUTES = (Public, ); }; };
 		AC47D9461B3BB41900AAEE9D /* ASRelativeSize.mm in Sources */ = {isa = PBXBuildFile; fileRef = AC47D9441B3BB41900AAEE9D /* ASRelativeSize.mm */; };
 		AC6456091B0A335000CF11B8 /* ASCellNode.m in Sources */ = {isa = PBXBuildFile; fileRef = AC6456071B0A335000CF11B8 /* ASCellNode.m */; };
+		ACC945A91BA9E7A0005E1FB8 /* ASViewController.h in Headers */ = {isa = PBXBuildFile; fileRef = ACC945A81BA9E7A0005E1FB8 /* ASViewController.h */; };
+		ACC945AB1BA9E7C1005E1FB8 /* ASViewController.m in Sources */ = {isa = PBXBuildFile; fileRef = ACC945AA1BA9E7C1005E1FB8 /* ASViewController.m */; };
 		ACF6ED1A1B17843500DA7C62 /* ASBackgroundLayoutSpec.h in Headers */ = {isa = PBXBuildFile; fileRef = ACF6ED011B17843500DA7C62 /* ASBackgroundLayoutSpec.h */; settings = {ATTRIBUTES = (Public, ); }; };
 		ACF6ED1B1B17843500DA7C62 /* ASBackgroundLayoutSpec.mm in Sources */ = {isa = PBXBuildFile; fileRef = ACF6ED021B17843500DA7C62 /* ASBackgroundLayoutSpec.mm */; };
 		ACF6ED1C1B17843500DA7C62 /* ASCenterLayoutSpec.h in Headers */ = {isa = PBXBuildFile; fileRef = ACF6ED031B17843500DA7C62 /* ASCenterLayoutSpec.h */; settings = {ATTRIBUTES = (Public, ); }; };
@@ -574,6 +576,8 @@
 		AC47D9431B3BB41900AAEE9D /* ASRelativeSize.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = ASRelativeSize.h; path = AsyncDisplayKit/Layout/ASRelativeSize.h; sourceTree = "<group>"; };
 		AC47D9441B3BB41900AAEE9D /* ASRelativeSize.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; name = ASRelativeSize.mm; path = AsyncDisplayKit/Layout/ASRelativeSize.mm; sourceTree = "<group>"; };
 		AC6456071B0A335000CF11B8 /* ASCellNode.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = ASCellNode.m; sourceTree = "<group>"; };
+		ACC945A81BA9E7A0005E1FB8 /* ASViewController.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = ASViewController.h; sourceTree = "<group>"; };
+		ACC945AA1BA9E7C1005E1FB8 /* ASViewController.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = ASViewController.m; sourceTree = "<group>"; };
 		ACF6ED011B17843500DA7C62 /* ASBackgroundLayoutSpec.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = ASBackgroundLayoutSpec.h; path = AsyncDisplayKit/Layout/ASBackgroundLayoutSpec.h; sourceTree = "<group>"; };
 		ACF6ED021B17843500DA7C62 /* ASBackgroundLayoutSpec.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; lineEnding = 0; name = ASBackgroundLayoutSpec.mm; path = AsyncDisplayKit/Layout/ASBackgroundLayoutSpec.mm; sourceTree = "<group>"; };
 		ACF6ED031B17843500DA7C62 /* ASCenterLayoutSpec.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = ASCenterLayoutSpec.h; path = AsyncDisplayKit/Layout/ASCenterLayoutSpec.h; sourceTree = "<group>"; };
@@ -758,6 +762,8 @@
 				0574D5E119C110610097DC25 /* ASTableViewProtocols.h */,
 				058D09DF195D050800B7D73C /* ASTextNode.h */,
 				058D09E0195D050800B7D73C /* ASTextNode.mm */,
+				ACC945A81BA9E7A0005E1FB8 /* ASViewController.h */,
+				ACC945AA1BA9E7C1005E1FB8 /* ASViewController.m */,
 				6BDC61F51978FEA400E50D21 /* AsyncDisplayKit.h */,
 				058D09E1195D050800B7D73C /* Details */,
 				058D0A01195D050800B7D73C /* Private */,
@@ -1114,6 +1120,7 @@
 				058D0A63195D05DC00B7D73C /* ASTextNodeTypes.h in Headers */,
 				058D0A64195D05DC00B7D73C /* ASTextNodeWordKerner.h in Headers */,
 				058D0A81195D05F900B7D73C /* ASThread.h in Headers */,
+				ACC945A91BA9E7A0005E1FB8 /* ASViewController.h in Headers */,
 				6BDC61F61979037800E50D21 /* AsyncDisplayKit.h in Headers */,
 				205F0E211B376416007741D0 /* CGRect+ASConvenience.h in Headers */,
 				058D0A66195D05DC00B7D73C /* NSMutableAttributedString+TextKitAdditions.h in Headers */,
@@ -1478,6 +1485,7 @@
 				058D0A1E195D050800B7D73C /* ASTextNodeShadower.m in Sources */,
 				058D0A1F195D050800B7D73C /* ASTextNodeTextKitHelpers.mm in Sources */,
 				058D0A20195D050800B7D73C /* ASTextNodeWordKerner.m in Sources */,
+				ACC945AB1BA9E7C1005E1FB8 /* ASViewController.m in Sources */,
 				205F0E221B376416007741D0 /* CGRect+ASConvenience.m in Sources */,
 				058D0A21195D050800B7D73C /* NSMutableAttributedString+TextKitAdditions.m in Sources */,
 				205F0E101B371875007741D0 /* UICollectionViewLayout+ASConvenience.m in Sources */,
--- a/AsyncDisplayKit/ASViewController.h
+++ b/AsyncDisplayKit/ASViewController.h
@@ -0,0 +1,18 @@
+//
+//  ASViewController.h
+//  AsyncDisplayKit
+//
+//  Created by Huy Nguyen on 16/09/15.
+//  Copyright (c) 2015 Facebook. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+#import <AsyncDisplayKit/AsyncDisplayKit.h>
+
+@interface ASViewController : UIViewController
+
+@property (nonatomic, strong, readonly) ASDisplayNode *node;
+
+- (instancetype)initWithNode:(ASDisplayNode *)node;
+
+@end
--- a/AsyncDisplayKit/ASViewController.m
+++ b/AsyncDisplayKit/ASViewController.m
@@ -0,0 +1,47 @@
+//
+//  ASViewController.m
+//  AsyncDisplayKit
+//
+//  Created by Huy Nguyen on 16/09/15.
+//  Copyright (c) 2015 Facebook. All rights reserved.
+//
+
+#import "ASViewController.h"
+#import "ASAssert.h"
+#import "ASDimension.h"
+
+@implementation ASViewController
+
+- (instancetype)initWithNode:(ASDisplayNode *)node
+{
+  if (!(self = [super init])) {
+    return nil;
+  }
+  
+  ASDisplayNodeAssertNotNil(node, @"Node must not be nil");
+  ASDisplayNodeAssertTrue(!node.layerBacked);
+  _node = node;
+  
+  return self;
+}
+
+- (void)loadView
+{
+  ASDisplayNodeAssertTrue(!_node.layerBacked);
+  self.view = _node.view;
+}
+
+- (void)viewWillLayoutSubviews
+{
+  ASSizeRange constrainedSize = ASSizeRangeMake(self.view.bounds.size, self.view.bounds.size);
+  [_node measureWithSizeRange:constrainedSize];
+  [super viewWillLayoutSubviews];
+}
+
+- (void)viewWillAppear:(BOOL)animated
+{
+  [super viewWillAppear:animated];
+  [_node recursivelyFetchData];
+}
+
+@end
--- a/AsyncDisplayKit/AsyncDisplayKit.h
+++ b/AsyncDisplayKit/AsyncDisplayKit.h
@@ -26,6 +26,8 @@

 #import <AsyncDisplayKit/ASScrollNode.h>

+#import <AsyncDisplayKit/ASViewController.h>
+
 #import <AsyncDisplayKit/ASLayout.h>
 #import <AsyncDisplayKit/ASDimension.h>
 #import <AsyncDisplayKit/ASLayoutable.h>
--- a/examples/Multiplex/Sample.xcodeproj/project.pbxproj
+++ b/examples/Multiplex/Sample.xcodeproj/project.pbxproj
@@ -14,6 +14,7 @@
 		3EC0CDCBA10D483D9F386E5E /* libPods.a in Frameworks */ = {isa = PBXBuildFile; fileRef = 3D24B17D1E4A4E7A9566C5E9 /* libPods.a */; };
 		6C2C82AC19EE274300767484 /* Default-667h@2x.png in Resources */ = {isa = PBXBuildFile; fileRef = 6C2C82AA19EE274300767484 /* Default-667h@2x.png */; };
 		6C2C82AD19EE274300767484 /* Default-736h@3x.png in Resources */ = {isa = PBXBuildFile; fileRef = 6C2C82AB19EE274300767484 /* Default-736h@3x.png */; };
+		ACC945AE1BA9EFBA005E1FB8 /* ScreenNode.m in Sources */ = {isa = PBXBuildFile; fileRef = ACC945AD1BA9EFBA005E1FB8 /* ScreenNode.m */; };
 /* End PBXBuildFile section */

 /* Begin PBXFileReference section */
@@ -29,6 +30,8 @@
 		3D24B17D1E4A4E7A9566C5E9 /* libPods.a */ = {isa = PBXFileReference; explicitFileType = archive.ar; includeInIndex = 0; path = libPods.a; sourceTree = BUILT_PRODUCTS_DIR; };
 		6C2C82AA19EE274300767484 /* Default-667h@2x.png */ = {isa = PBXFileReference; lastKnownFileType = image.png; path = "Default-667h@2x.png"; sourceTree = SOURCE_ROOT; };
 		6C2C82AB19EE274300767484 /* Default-736h@3x.png */ = {isa = PBXFileReference; lastKnownFileType = image.png; path = "Default-736h@3x.png"; sourceTree = SOURCE_ROOT; };
+		ACC945AC1BA9EFB3005E1FB8 /* ScreenNode.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = ScreenNode.h; sourceTree = "<group>"; };
+		ACC945AD1BA9EFBA005E1FB8 /* ScreenNode.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = ScreenNode.m; sourceTree = "<group>"; };
 		C068F1D3F0CC317E895FCDAB /* Pods.debug.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = Pods.debug.xcconfig; path = "Pods/Target Support Files/Pods/Pods.debug.xcconfig"; sourceTree = "<group>"; };
 /* End PBXFileReference section */

@@ -72,6 +75,8 @@
 				05E2128919D4DB510098F589 /* AppDelegate.m */,
 				05E2128B19D4DB510098F589 /* ViewController.h */,
 				05E2128C19D4DB510098F589 /* ViewController.m */,
+				ACC945AC1BA9EFB3005E1FB8 /* ScreenNode.h */,
+				ACC945AD1BA9EFBA005E1FB8 /* ScreenNode.m */,
 				05E2128419D4DB510098F589 /* Supporting Files */,
 			);
 			path = Sample;
@@ -214,6 +219,7 @@
 				05E2128D19D4DB510098F589 /* ViewController.m in Sources */,
 				05E2128A19D4DB510098F589 /* AppDelegate.m in Sources */,
 				05E2128719D4DB510098F589 /* main.m in Sources */,
+				ACC945AE1BA9EFBA005E1FB8 /* ScreenNode.m in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
--- a/examples/Multiplex/Sample/ScreenNode.h
+++ b/examples/Multiplex/Sample/ScreenNode.h
@@ -0,0 +1,19 @@
+//
+//  ScreenNode.h
+//  Sample
+//
+//  Created by Huy Nguyen on 16/09/15.
+//  Copyright (c) 2015 Facebook. All rights reserved.
+//
+
+#import <AsyncDisplayKit/AsyncDisplayKit.h>
+
+@interface ScreenNode : ASDisplayNode
+
+@property (nonatomic, strong) ASMultiplexImageNode *imageNode;
+@property (nonatomic, strong) ASTextNode *textNode;
+
+- (void)start;
+- (void)reload;
+
+@end
--- a/examples/Multiplex/Sample/ScreenNode.m
+++ b/examples/Multiplex/Sample/ScreenNode.m
@@ -0,0 +1,156 @@
+//
+//  ScreenNode.m
+//  Sample
+//
+//  Created by Huy Nguyen on 16/09/15.
+//  Copyright (c) 2015 Facebook. All rights reserved.
+//
+
+#import "ScreenNode.h"
+#import "AsyncDisplayKit/AsyncDisplayKit.h"
+
+@interface ScreenNode() <ASMultiplexImageNodeDataSource, ASMultiplexImageNodeDelegate, ASImageDownloaderProtocol>
+@end
+
+@implementation ScreenNode
+
+- (instancetype)init
+{
+  if (!(self = [super init])) {
+    return nil;
+  }
+
+  // multiplex image node!
+  // NB:  we're using a custom downloader with an artificial delay for this demo, but ASBasicImageDownloader works too!
+  _imageNode = [[ASMultiplexImageNode alloc] initWithCache:nil downloader:self];
+  _imageNode.dataSource = self;
+  _imageNode.delegate = self;
+  
+  // placeholder colour
+  _imageNode.backgroundColor = ASDisplayNodeDefaultPlaceholderColor();
+  
+  // load low-quality images before high-quality images
+  _imageNode.downloadsIntermediateImages = YES;
+  
+  // simple status label
+  _textNode = [[ASTextNode alloc] init];
+  
+  [self addSubnode:_imageNode];
+  [self addSubnode:_textNode];
+  
+  return self;
+}
+
+- (void)start
+{
+  [self setText:@"loading…"];
+  _textNode.userInteractionEnabled = NO;
+  _imageNode.imageIdentifiers = @[ @"best", @"medium", @"worst" ]; // go!
+}
+
+- (void)reload {
+  [self start];
+  [_imageNode reloadImageIdentifierSources];
+}
+
+- (void)setText:(NSString *)text
+{
+  NSDictionary *attributes = @{NSFontAttributeName: [UIFont fontWithName:@"HelveticaNeue-Light" size:22.0f]};
+  NSAttributedString *string = [[NSAttributedString alloc] initWithString:text
+                                                               attributes:attributes];
+  _textNode.attributedString = string;
+  [self setNeedsLayout];
+}
+
+- (ASLayoutSpec *)layoutSpecThatFits:(ASSizeRange)constrainedSize
+{
+  return
+  [ASInsetLayoutSpec
+   insetLayoutSpecWithInsets:UIEdgeInsetsMake(10, 10, 10, 10)
+   child:
+   [ASStackLayoutSpec
+    stackLayoutSpecWithDirection:ASStackLayoutDirectionVertical
+    spacing:10
+    justifyContent:ASStackLayoutJustifyContentCenter
+    alignItems:ASStackLayoutAlignItemsCenter
+    children:@[[ASRatioLayoutSpec ratioLayoutSpecWithRatio:1 child:_imageNode], _textNode]]];
+}
+
+#pragma mark -
+#pragma mark ASMultiplexImageNode data source & delegate.
+
+- (NSURL *)multiplexImageNode:(ASMultiplexImageNode *)imageNode URLForImageIdentifier:(id)imageIdentifier
+{
+  if ([imageIdentifier isEqualToString:@"worst"]) {
+    return [NSURL URLWithString:@"https://raw.githubusercontent.com/facebook/AsyncDisplayKit/master/examples/Multiplex/worst.png"];
+  }
+  
+  if ([imageIdentifier isEqualToString:@"medium"]) {
+    return [NSURL URLWithString:@"https://raw.githubusercontent.com/facebook/AsyncDisplayKit/master/examples/Multiplex/medium.png"];
+  }
+  
+  if ([imageIdentifier isEqualToString:@"best"]) {
+    return [NSURL URLWithString:@"https://raw.githubusercontent.com/facebook/AsyncDisplayKit/master/examples/Multiplex/best.png"];
+  }
+  
+  // unexpected identifier
+  return nil;
+}
+
+- (void)multiplexImageNode:(ASMultiplexImageNode *)imageNode didFinishDownloadingImageWithIdentifier:(id)imageIdentifier error:(NSError *)error
+{
+  [self setText:[NSString stringWithFormat:@"loaded '%@'", imageIdentifier]];
+  
+  if ([imageIdentifier isEqualToString:@"best"]) {
+    [self setText:[_textNode.attributedString.string stringByAppendingString:@".  tap to reload"]];
+    _textNode.userInteractionEnabled = YES;
+  }
+}
+
+
+#pragma mark -
+#pragma mark ASImageDownloaderProtocol.
+
+- (id)downloadImageWithURL:(NSURL *)URL
+             callbackQueue:(dispatch_queue_t)callbackQueue
+     downloadProgressBlock:(void (^)(CGFloat progress))downloadProgressBlock
+                completion:(void (^)(CGImageRef image, NSError *error))completion
+{
+  // if no callback queue is supplied, run on the main thread
+  if (callbackQueue == nil) {
+    callbackQueue = dispatch_get_main_queue();
+  }
+  
+  // call completion blocks
+  void (^handler)(NSURLResponse *, NSData *, NSError *) = ^(NSURLResponse *response, NSData *data, NSError *connectionError) {
+    // add an artificial delay
+    usleep(1.0 * USEC_PER_SEC);
+    
+    // ASMultiplexImageNode callbacks
+    dispatch_async(callbackQueue, ^{
+      if (downloadProgressBlock) {
+        downloadProgressBlock(1.0f);
+      }
+      
+      if (completion) {
+        completion([[UIImage imageWithData:data] CGImage], connectionError);
+      }
+    });
+  };
+  
+  // let NSURLConnection do the heavy lifting
+  NSURLRequest *request = [NSURLRequest requestWithURL:URL];
+  [NSURLConnection sendAsynchronousRequest:request
+                                     queue:[[NSOperationQueue alloc] init]
+                         completionHandler:handler];
+  
+  // return nil, don't support cancellation
+  return nil;
+}
+
+- (void)cancelImageDownloadForIdentifier:(id)downloadIdentifier
+{
+  // no-op, don't support cancellation
+}
+
+@end
--- a/examples/Multiplex/Sample/ViewController.h
+++ b/examples/Multiplex/Sample/ViewController.h
@@ -9,8 +9,8 @@
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

-#import <UIKit/UIKit.h>
+#import <AsyncDisplayKit/ASViewController.h>

-@interface ViewController : UIViewController
+@interface ViewController : ASViewController

@end
--- a/examples/Multiplex/Sample/ViewController.m
+++ b/examples/Multiplex/Sample/ViewController.m
@@ -10,77 +10,39 @@
 */

 #import "ViewController.h"
+#import "ScreenNode.h"

-#import <AsyncDisplayKit/AsyncDisplayKit.h>
-
-
-@interface ViewController () <ASMultiplexImageNodeDataSource, ASMultiplexImageNodeDelegate, ASImageDownloaderProtocol>
-{
-  ASMultiplexImageNode *_imageNode;
-
-  UILabel *_textLabel;
+@interface ViewController() {
+  ScreenNode *_screenNode;
 }

@end

-
@implementation ViewController

 - (instancetype)init
 {
-  if (!(self = [super init]))
+  ScreenNode *node = [[ScreenNode alloc] init];
+  if (!(self = [super initWithNode:node]))
    return nil;

-
-  // multiplex image node!
-  // NB:  we're using a custom downloader with an artificial delay for this demo, but ASBasicImageDownloader works too!
-  _imageNode = [[ASMultiplexImageNode alloc] initWithCache:nil downloader:self];
-  _imageNode.dataSource = self;
-  _imageNode.delegate = self;
-
-  // placeholder colour
-  _imageNode.backgroundColor = ASDisplayNodeDefaultPlaceholderColor();
-
-  // load low-quality images before high-quality images
-  _imageNode.downloadsIntermediateImages = YES;
-
-
-  // simple status label
-  _textLabel = [[UILabel alloc] init];
-  _textLabel.textAlignment = NSTextAlignmentCenter;
-  _textLabel.font = [UIFont fontWithName:@"HelveticaNeue-Light" size:22.0f];
+  _screenNode = node;

  // tap to reload
  UITapGestureRecognizer *gr = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(reload:)];
-  [_textLabel addGestureRecognizer:gr];
-
+  [_screenNode.textNode.view addGestureRecognizer:gr];

  return self;
 }

- (void)viewDidLoad
+- (void)viewWillAppear:(BOOL)animated
 {
-  [super viewDidLoad];
-
-  [self.view addSubnode:_imageNode];
-  [self.view addSubview:_textLabel];
-
-  [self start];
+  [super viewWillAppear:animated];
+  [_screenNode start];
 }

- (void)viewWillLayoutSubviews
-{
-  static CGFloat padding = 40.0f;
-
-  // lay out image
-  CGFloat imageWidth = self.view.bounds.size.width - padding;
-  CGPoint imageOrigin = CGPointMake(roundf((self.view.bounds.size.width - imageWidth) / 2.0f),
-                                    roundf((self.view.bounds.size.height - imageWidth) / 2.0f));
-  _imageNode.frame = (CGRect){ imageOrigin, CGSizeMake(imageWidth, imageWidth) };
-
-  // label
-  CGSize textSize = [_textLabel sizeThatFits:CGSizeMake(self.view.bounds.size.width, FLT_MAX)];
-  _textLabel.frame = CGRectMake(0.0f, imageOrigin.y + imageWidth + padding, self.view.bounds.size.width, textSize.height);
+- (void)reload:(id)sender {
+  [_screenNode reload];
 }

 - (BOOL)prefersStatusBarHidden
@@ -88,95 +50,4 @@
  return YES;
 }

- (void)start
-{
-  _textLabel.text = @"loading…";
-  _textLabel.userInteractionEnabled = NO;
-
-  _imageNode.imageIdentifiers = @[ @"best", @"medium", @"worst" ]; // go!
-}
-
- (void)reload:(id)sender {
-  [self start];
-  [_imageNode reloadImageIdentifierSources];
-}
-
-
-#pragma mark -
-#pragma mark ASMultiplexImageNode data source & delegate.
-
- (NSURL *)multiplexImageNode:(ASMultiplexImageNode *)imageNode URLForImageIdentifier:(id)imageIdentifier
-{
-  if ([imageIdentifier isEqualToString:@"worst"]) {
-    return [NSURL URLWithString:@"https://raw.githubusercontent.com/facebook/AsyncDisplayKit/master/examples/Multiplex/worst.png"];
-  }
-
-  if ([imageIdentifier isEqualToString:@"medium"]) {
-    return [NSURL URLWithString:@"https://raw.githubusercontent.com/facebook/AsyncDisplayKit/master/examples/Multiplex/medium.png"];
-  }
-
-  if ([imageIdentifier isEqualToString:@"best"]) {
-    return [NSURL URLWithString:@"https://raw.githubusercontent.com/facebook/AsyncDisplayKit/master/examples/Multiplex/best.png"];
-  }
-
-  // unexpected identifier
-  return nil;
-}
-
- (void)multiplexImageNode:(ASMultiplexImageNode *)imageNode didFinishDownloadingImageWithIdentifier:(id)imageIdentifier error:(NSError *)error
-{
-  _textLabel.text = [NSString stringWithFormat:@"loaded '%@'", imageIdentifier];
-
-  if ([imageIdentifier isEqualToString:@"best"]) {
-    _textLabel.text = [_textLabel.text stringByAppendingString:@".  tap to reload"];
-    _textLabel.userInteractionEnabled = YES;
-  }
-}
-
-
-#pragma mark -
-#pragma mark ASImageDownloaderProtocol.
-
- (id)downloadImageWithURL:(NSURL *)URL
-             callbackQueue:(dispatch_queue_t)callbackQueue
-     downloadProgressBlock:(void (^)(CGFloat progress))downloadProgressBlock
-                completion:(void (^)(CGImageRef image, NSError *error))completion
-{
-  // if no callback queue is supplied, run on the main thread
-  if (callbackQueue == nil) {
-    callbackQueue = dispatch_get_main_queue();
-  }
-
-  // call completion blocks
-  void (^handler)(NSURLResponse *, NSData *, NSError *) = ^(NSURLResponse *response, NSData *data, NSError *connectionError) {
-    // add an artificial delay
-    usleep(1.0 * USEC_PER_SEC);
-
-    // ASMultiplexImageNode callbacks
-    dispatch_async(callbackQueue, ^{
-      if (downloadProgressBlock) {
-        downloadProgressBlock(1.0f);
-      }
-
-      if (completion) {
-        completion([[UIImage imageWithData:data] CGImage], connectionError);
-      }
-    });
-  };
-
-  // let NSURLConnection do the heavy lifting
-  NSURLRequest *request = [NSURLRequest requestWithURL:URL];
-  [NSURLConnection sendAsynchronousRequest:request
-                                     queue:[[NSOperationQueue alloc] init]
-                         completionHandler:handler];
-
-  // return nil, don't support cancellation
-  return nil;
-}
-
- (void)cancelImageDownloadForIdentifier:(id)downloadIdentifier
-{
-  // no-op, don't support cancellation
-}
-
@end