Substantially improve behavior of nested Table & Collection Nodes

This ensures memory cleanup happens correctly and introduces a new test project to support developing new features while stressing tough use cases for correctness.
2025-12-10 00:01:44 +00:00 · 2015-11-14 15:25:35 -08:00 · 2015-11-14 15:25:35 -08:00 · 2a0b9c8e14
commit 2a0b9c8e14
parent a24cfe691a
30 changed files with 997 additions and 41 deletions
--- a/AsyncDisplayKit/ASCollectionNode.m
+++ b/AsyncDisplayKit/ASCollectionNode.m
@ -30,4 +30,16 @@
  return (ASCollectionView *)[super view];
 }

+- (void)clearContents
+{
+  [super clearContents];
+  [self.view clearContents];
+}
+
+- (void)clearFetchedData
+{
+  [super clearFetchedData];
+  [self.view clearFetchedData];
+}
+
@end
--- a/AsyncDisplayKit/ASCollectionView.h
+++ b/AsyncDisplayKit/ASCollectionView.h
@ -281,6 +281,20 @@
 */
 - (ASScrollDirection)scrollableDirections;

+/**
+ * Triggers all loaded ASCellNodes to destroy displayed contents (freeing a lot of memory).
+ *
+ * @discussion This method should only be called by ASCollectionNode.  To be removed in a later release.
+ */
+- (void)clearContents;
+
+/**
+ * Triggers all loaded ASCellNodes to purge any data fetched from the network or disk (freeing memory).
+ *
+ * @discussion This method should only be called by ASCollectionNode.  To be removed in a later release.
+ */
+- (void)clearFetchedData;
+
@end


--- a/AsyncDisplayKit/ASCollectionView.mm
+++ b/AsyncDisplayKit/ASCollectionView.mm
@ -898,4 +898,24 @@ static BOOL _isInterceptedSelector(SEL sel)
  [super performBatchUpdates:^{} completion:nil];
 }

+#pragma mark - Memory Management
+
+- (void)clearContents
+{
+  for (NSArray *section in [_dataController completedNodes]) {
+    for (ASDisplayNode *node in section) {
+      [node recursivelyClearContents];
+    }
+  }
+}
+
+- (void)clearFetchedData
+{
+  for (NSArray *section in [_dataController completedNodes]) {
+    for (ASDisplayNode *node in section) {
+      [node recursivelyClearFetchedData];
+    }
+  }
+}
+
@end
--- a/AsyncDisplayKit/ASDisplayNode.mm
+++ b/AsyncDisplayKit/ASDisplayNode.mm
@ -747,29 +747,6 @@ static ASDisplayNodeMethodOverrides GetASDisplayNodeMethodOverrides(Class c)
  }
 }

- (void)__setSafeFrame:(CGRect)rect
-{
-  ASDisplayNodeAssertThreadAffinity(self);
-  ASDN::MutexLocker l(_propertyLock);
-  
-  BOOL useLayer = (_layer && ASDisplayNodeThreadIsMain());
-  
-  CGPoint origin      = (useLayer ? _layer.bounds.origin : self.bounds.origin);
-  CGPoint anchorPoint = (useLayer ? _layer.anchorPoint   : self.anchorPoint);
-  
-  CGRect bounds       = (CGRect){ origin, rect.size };
-  CGPoint position    = CGPointMake(rect.origin.x + rect.size.width * anchorPoint.x,
-                                    rect.origin.y + rect.size.height * anchorPoint.y);
-  
-  if (useLayer) {
-    _layer.bounds = bounds;
-    _layer.position = position;
-  } else {
-    self.bounds = bounds;
-    self.position = position;
-  }
-}
-
 // These private methods ensure that subclasses are not required to call super in order for _renderingSubnodes to be properly managed.

 - (void)__layout
@ -1715,12 +1692,14 @@ void recursivelyEnsureDisplayForLayer(CALayer *layer)
  }

  // Assume that _layout was flattened and is 1-level deep.
+  ASDisplayNode *subnode = nil;
+  CGRect subnodeFrame = CGRectZero;
  for (ASLayout *subnodeLayout in _layout.sublayouts) {
    ASDisplayNodeAssert([_subnodes containsObject:subnodeLayout.layoutableObject], @"Cached sublayouts must only contain subnodes' layout.");
-    [((ASDisplayNode *)subnodeLayout.layoutableObject) __setSafeFrame:CGRectMake(subnodeLayout.position.x,
-                                                                                 subnodeLayout.position.y,
-                                                                                 subnodeLayout.size.width,
-                                                                                 subnodeLayout.size.height)];
+    subnodeFrame.origin = subnodeLayout.position;
+    subnodeFrame.size = subnodeLayout.size;
+    subnode = ((ASDisplayNode *)subnodeLayout.layoutableObject);
+    [subnode setFrame:subnodeFrame];
  }
 }

--- a/AsyncDisplayKit/ASTableNode.m
+++ b/AsyncDisplayKit/ASTableNode.m
@ -25,4 +25,16 @@
  return (ASTableView *)[super view];
 }

+- (void)clearContents
+{
+  [super clearContents];
+  [self.view clearContents];
+}
+
+- (void)clearFetchedData
+{
+  [super clearFetchedData];
+  [self.view clearFetchedData];
+}
+
@end
--- a/AsyncDisplayKit/ASTableView.h
+++ b/AsyncDisplayKit/ASTableView.h
@ -260,6 +260,20 @@
 */
@property (nonatomic) BOOL automaticallyAdjustsContentOffset;

+/**
+ * Triggers all loaded ASCellNodes to destroy displayed contents (freeing a lot of memory).
+ *
+ * @discussion This method should only be called by ASTableNode.  To be removed in a later release.
+ */
+- (void)clearContents;
+
+/**
+ * Triggers all loaded ASCellNodes to purge any data fetched from the network or disk (freeing memory).
+ *
+ * @discussion This method should only be called by ASTableNode.  To be removed in a later release.
+ */
+- (void)clearFetchedData;
+
@end


--- a/AsyncDisplayKit/ASTableView.mm
+++ b/AsyncDisplayKit/ASTableView.mm
@ -907,4 +907,24 @@ static BOOL _isInterceptedSelector(SEL sel)
  [super endUpdates];
 }

+#pragma mark - Memory Management
+
+- (void)clearContents
+{
+  for (NSArray *section in [_dataController completedNodes]) {
+    for (ASDisplayNode *node in section) {
+      [node recursivelyClearContents];
+    }
+  }
+}
+
+- (void)clearFetchedData
+{
+  for (NSArray *section in [_dataController completedNodes]) {
+    for (ASDisplayNode *node in section) {
+      [node recursivelyClearFetchedData];
+    }
+  }
+}
+
@end
--- a/AsyncDisplayKit/Details/UIView+ASConvenience.h
+++ b/AsyncDisplayKit/Details/UIView+ASConvenience.h
@ -45,14 +45,15 @@
 */
@protocol ASDisplayNodeViewProperties

-@property (nonatomic, assign)                           BOOL clipsToBounds;
-@property (nonatomic, getter=isHidden)                  BOOL hidden;
-@property (nonatomic, assign)                           BOOL autoresizesSubviews;
-@property (nonatomic, assign)                           UIViewAutoresizing autoresizingMask;
-@property (nonatomic, retain)                           UIColor *tintColor;
-@property (nonatomic, assign)                           CGFloat alpha;
-@property (nonatomic, assign)                           CGRect bounds;
-@property (nonatomic, assign)                           UIViewContentMode contentMode;
+@property (nonatomic, assign)           BOOL clipsToBounds;
+@property (nonatomic, getter=isHidden)  BOOL hidden;
+@property (nonatomic, assign)           BOOL autoresizesSubviews;
+@property (nonatomic, assign)           UIViewAutoresizing autoresizingMask;
+@property (nonatomic, retain)           UIColor *tintColor;
+@property (nonatomic, assign)           CGFloat alpha;
+@property (nonatomic, assign)           CGRect bounds;
+@property (nonatomic, assign)           CGRect frame;   // Only for use with nodes wrapping synchronous views
+@property (nonatomic, assign)           UIViewContentMode contentMode;
@property (nonatomic, assign, getter=isUserInteractionEnabled) BOOL userInteractionEnabled;
@property (nonatomic, assign, getter=isExclusiveTouch) BOOL exclusiveTouch;
@property (nonatomic, assign, getter=asyncdisplaykit_isAsyncTransactionContainer, setter = asyncdisplaykit_setAsyncTransactionContainer:) BOOL asyncdisplaykit_asyncTransactionContainer;
--- a/AsyncDisplayKit/Private/ASDisplayNode+UIViewBridge.mm
+++ b/AsyncDisplayKit/Private/ASDisplayNode+UIViewBridge.mm
@ -178,7 +178,42 @@
  ASDisplayNodeAssert(CATransform3DIsIdentity(self.transform), @"-[ASDisplayNode setFrame:] - self.transform must be identity in order to set the frame property.  (From Apple's UIView documentation: If the transform property is not the identity transform, the value of this property is undefined and therefore should be ignored.)");
 #endif

-  [self __setSafeFrame:rect];
+  if (_flags.synchronous && !_flags.layerBacked) {
+    // For classes like ASTableNode, ASCollectionNode, ASScrollNode and similar - make sure UIView gets setFrame:
+    _setToViewOnly(frame, rect);
+  } else {
+    // This is by far the common case / hot path.
+    [self __setSafeFrame:rect];
+  }
+}
+
+/**
+ * Sets a new frame to this node by changing its bounds and position. This method can be safely called even if
+ * the transform is a non-identity transform, because bounds and position can be set instead of frame.
+ * This is NOT called for synchronous nodes (wrapping regular views), which may rely on a [UIView setFrame:] call.
+ * A notable example of the latter is UITableView, which won't resize its internal container if only layer bounds are set.
+ */
+- (void)__setSafeFrame:(CGRect)rect
+{
+  ASDisplayNodeAssertThreadAffinity(self);
+  ASDN::MutexLocker l(_propertyLock);
+  
+  BOOL useLayer = (_layer && ASDisplayNodeThreadIsMain());
+  
+  CGPoint origin      = (useLayer ? _layer.bounds.origin : self.bounds.origin);
+  CGPoint anchorPoint = (useLayer ? _layer.anchorPoint   : self.anchorPoint);
+  
+  CGRect  bounds      = (CGRect){ origin, rect.size };
+  CGPoint position    = CGPointMake(rect.origin.x + rect.size.width * anchorPoint.x,
+                                    rect.origin.y + rect.size.height * anchorPoint.y);
+  
+  if (useLayer) {
+    _layer.bounds = bounds;
+    _layer.position = position;
+  } else {
+    self.bounds = bounds;
+    self.position = position;
+  }
 }

 - (void)setNeedsDisplay
--- a/AsyncDisplayKit/Private/ASDisplayNodeInternal.h
+++ b/AsyncDisplayKit/Private/ASDisplayNodeInternal.h
@ -125,11 +125,6 @@ typedef NS_OPTIONS(NSUInteger, ASDisplayNodeMethodOverrides) {
 - (ASLayout *)__measureWithSizeRange:(ASSizeRange)constrainedSize;

 - (void)__setNeedsLayout;
-/**
- * Sets a new frame to this node by changing its bounds and position. This method can be safely called even if the transform property 
- * contains a non-identity transform, because bounds and position can be changed in such case.
- */
- (void)__setSafeFrame:(CGRect)rect;
 - (void)__layout;
 - (void)__setSupernode:(ASDisplayNode *)supernode;

--- a/AsyncDisplayKit/Private/_ASPendingState.m
+++ b/AsyncDisplayKit/Private/_ASPendingState.m
@ -18,6 +18,7 @@

  UIViewAutoresizing autoresizingMask;
  unsigned int edgeAntialiasingMask;
+  CGRect frame;   // Frame is only to be used for synchronous views wrapped by nodes (see setFrame:)
  CGRect bounds;
  CGColorRef backgroundColor;
  id contents;
@ -60,6 +61,7 @@
    int setNeedsDisplayOnBoundsChange:1;
    int setAutoresizesSubviews:1;
    int setAutoresizingMask:1;
+    int setFrame:1;
    int setBounds:1;
    int setBackgroundColor:1;
    int setTintColor:1;
@ -103,6 +105,7 @@

@synthesize clipsToBounds=clipsToBounds;
@synthesize opaque=opaque;
+@synthesize frame=frame;
@synthesize bounds=bounds;
@synthesize backgroundColor=backgroundColor;
@synthesize contents=contents;
@ -150,6 +153,7 @@
  // Set defaults, these come from the defaults specified in CALayer and UIView
  clipsToBounds = NO;
  opaque = YES;
+  frame = CGRectZero;
  bounds = CGRectZero;
  backgroundColor = nil;
  tintColor = [UIColor colorWithRed:0.0 green:0.478 blue:1.0 alpha:1.0];
@ -250,6 +254,12 @@
  _flags.setAutoresizingMask = YES;
 }

+- (void)setFrame:(CGRect)newFrame
+{
+  frame = newFrame;
+  _flags.setFrame = YES;
+}
+
 - (void)setBounds:(CGRect)newBounds
 {
  bounds = newBounds;
@ -626,6 +636,9 @@

  if (_flags.setOpaque)
    ASDisplayNodeAssert(layer.opaque == opaque, @"Didn't set opaque as desired");
+  
+  if (_flags.setFrame)
+    ASDisplayNodeAssert(NO, @"Frame property should only be used for synchronously wrapped nodes.  See setFrame: in ASDisplayNode+UIViewBridge");
 }

 - (void)applyToView:(UIView *)view
@ -649,6 +662,11 @@
  if (_flags.setZPosition)
    layer.zPosition = zPosition;

+  // This should only be used for synchronous views wrapped by nodes.
+  if (_flags.setFrame && !(_flags.setBounds && _flags.setPosition)) {
+    view.frame = frame;
+  }
+  
  if (_flags.setBounds)
    view.bounds = bounds;

--- a/examples/HorizontalWithinVerticalScrolling/Sample/RandomCoreGraphicsNode.m
+++ b/examples/HorizontalWithinVerticalScrolling/Sample/RandomCoreGraphicsNode.m
@ -38,6 +38,7 @@
  CGGradientDrawingOptions drawingOptions;
  CGContextDrawLinearGradient(ctx, gradient, CGPointZero, CGPointMake(bounds.size.width, bounds.size.height), drawingOptions);
  
+  CGGradientRelease(gradient);
  CGColorSpaceRelease(colorSpace);
 }

--- a/examples/VerticalWithinHorizontalScrolling/Default-568h@2x.png
+++ b/examples/VerticalWithinHorizontalScrolling/Default-568h@2x.png
--- a/examples/VerticalWithinHorizontalScrolling/Default-667h@2x.png
+++ b/examples/VerticalWithinHorizontalScrolling/Default-667h@2x.png
--- a/examples/VerticalWithinHorizontalScrolling/Default-736h@3x.png
+++ b/examples/VerticalWithinHorizontalScrolling/Default-736h@3x.png
--- a/examples/VerticalWithinHorizontalScrolling/Podfile
+++ b/examples/VerticalWithinHorizontalScrolling/Podfile
@ -0,0 +1,3 @@
+source 'https://github.com/CocoaPods/Specs.git'
+platform :ios, '8.0'
+pod 'AsyncDisplayKit', :path => '../..'
--- a/examples/VerticalWithinHorizontalScrolling/Sample.xcodeproj/project.pbxproj
+++ b/examples/VerticalWithinHorizontalScrolling/Sample.xcodeproj/project.pbxproj
@ -0,0 +1,361 @@
+// !$*UTF8*$!
+{
+	archiveVersion = 1;
+	classes = {
+	};
+	objectVersion = 46;
+	objects = {
+
+/* Begin PBXBuildFile section */
+		05561CFD19D4F94A00CBA93C /* GradientTableNode.mm in Sources */ = {isa = PBXBuildFile; fileRef = 05561CFC19D4F94A00CBA93C /* GradientTableNode.mm */; };
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+/* End PBXShellScriptBuildPhase section */
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+				GCC_PREPROCESSOR_DEFINITIONS = (
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+				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
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+			name = Debug;
+		};
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+			buildSettings = {
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+				CLANG_ENABLE_OBJC_ARC = YES;
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+				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
+				GCC_WARN_UNUSED_FUNCTION = YES;
+				GCC_WARN_UNUSED_VARIABLE = YES;
+				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				MTL_ENABLE_DEBUG_INFO = NO;
+				SDKROOT = iphoneos;
+				VALIDATE_PRODUCT = YES;
+			};
+			name = Release;
+		};
+		05E212A519D4DB510098F589 /* Debug */ = {
+			isa = XCBuildConfiguration;
+			baseConfigurationReference = C068F1D3F0CC317E895FCDAB /* Pods.debug.xcconfig */;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				INFOPLIST_FILE = Sample/Info.plist;
+				IPHONEOS_DEPLOYMENT_TARGET = 7.1;
+				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				TARGETED_DEVICE_FAMILY = "1,2";
+			};
+			name = Debug;
+		};
+		05E212A619D4DB510098F589 /* Release */ = {
+			isa = XCBuildConfiguration;
+			baseConfigurationReference = 088AA6578212BE9BFBB07B70 /* Pods.release.xcconfig */;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				INFOPLIST_FILE = Sample/Info.plist;
+				IPHONEOS_DEPLOYMENT_TARGET = 7.1;
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+				PRODUCT_NAME = "$(TARGET_NAME)";
+				TARGETED_DEVICE_FAMILY = "1,2";
+			};
+			name = Release;
+		};
+/* End XCBuildConfiguration section */
+
+/* Begin XCConfigurationList section */
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+			isa = XCConfigurationList;
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+			defaultConfigurationName = Release;
+		};
+		05E212A419D4DB510098F589 /* Build configuration list for PBXNativeTarget "Sample" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
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+			);
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+			defaultConfigurationName = Release;
+		};
+/* End XCConfigurationList section */
+	};
+	rootObject = 05E2127919D4DB510098F589 /* Project object */;
+}
--- a/examples/VerticalWithinHorizontalScrolling/Sample.xcodeproj/project.xcworkspace/contents.xcworkspacedata
+++ b/examples/VerticalWithinHorizontalScrolling/Sample.xcodeproj/project.xcworkspace/contents.xcworkspacedata
@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "self:Sample.xcodeproj">
+   </FileRef>
+</Workspace>
--- a/examples/VerticalWithinHorizontalScrolling/Sample.xcodeproj/xcshareddata/xcschemes/Sample.xcscheme
+++ b/examples/VerticalWithinHorizontalScrolling/Sample.xcodeproj/xcshareddata/xcschemes/Sample.xcscheme
@ -0,0 +1,88 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "0620"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "05E2128019D4DB510098F589"
+               BuildableName = "Sample.app"
+               BlueprintName = "Sample"
+               ReferencedContainer = "container:Sample.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      buildConfiguration = "Debug">
+      <Testables>
+      </Testables>
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "05E2128019D4DB510098F589"
+            BuildableName = "Sample.app"
+            BlueprintName = "Sample"
+            ReferencedContainer = "container:Sample.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+   </TestAction>
+   <LaunchAction
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      buildConfiguration = "Debug"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      allowLocationSimulation = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "05E2128019D4DB510098F589"
+            BuildableName = "Sample.app"
+            BlueprintName = "Sample"
+            ReferencedContainer = "container:Sample.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </LaunchAction>
+   <ProfileAction
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      buildConfiguration = "Release"
+      debugDocumentVersioning = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "05E2128019D4DB510098F589"
+            BuildableName = "Sample.app"
+            BlueprintName = "Sample"
+            ReferencedContainer = "container:Sample.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>
--- a/examples/VerticalWithinHorizontalScrolling/Sample.xcworkspace/contents.xcworkspacedata
+++ b/examples/VerticalWithinHorizontalScrolling/Sample.xcworkspace/contents.xcworkspacedata
@ -0,0 +1 @@
+<?xml version='1.0' encoding='UTF-8'?><Workspace version='1.0'><FileRef location='group:Sample.xcodeproj'/><FileRef location='group:Pods/Pods.xcodeproj'/></Workspace>
--- a/examples/VerticalWithinHorizontalScrolling/Sample/AppDelegate.h
+++ b/examples/VerticalWithinHorizontalScrolling/Sample/AppDelegate.h
@ -0,0 +1,20 @@
+/* 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 <UIKit/UIKit.h>
+
+#define UseAutomaticLayout 1
+
+@interface AppDelegate : UIResponder <UIApplicationDelegate>
+
+@property (strong, nonatomic) UIWindow *window;
+
+@end
--- a/examples/VerticalWithinHorizontalScrolling/Sample/AppDelegate.m
+++ b/examples/VerticalWithinHorizontalScrolling/Sample/AppDelegate.m
@ -0,0 +1,27 @@
+/* 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 "AppDelegate.h"
+
+#import "ViewController.h"
+
+@implementation AppDelegate
+
+- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
+{
+  self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
+  self.window.backgroundColor = [UIColor whiteColor];
+  self.window.rootViewController = [[UINavigationController alloc] initWithRootViewController:[[ViewController alloc] init]];
+  [self.window makeKeyAndVisible];
+  return YES;
+}
+
+@end
--- a/examples/VerticalWithinHorizontalScrolling/Sample/GradientTableNode.h
+++ b/examples/VerticalWithinHorizontalScrolling/Sample/GradientTableNode.h
@ -0,0 +1,22 @@
+/* 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 <AsyncDisplayKit/AsyncDisplayKit.h>
+
+/**
+ * This ASCellNode contains an ASTableNode.  It intelligently interacts with a containing ASCollectionView,
+ * to preload and clean up contents as the user scrolls around both vertically and horizontally — in a way that minimizes memory usage.
+ */
+@interface GradientTableNode : ASCellNode <ASTableViewDelegate, ASTableViewDataSource>
+
+- (instancetype)initWithElementSize:(CGSize)size;
+
+@end
--- a/examples/VerticalWithinHorizontalScrolling/Sample/GradientTableNode.mm
+++ b/examples/VerticalWithinHorizontalScrolling/Sample/GradientTableNode.mm
@ -0,0 +1,76 @@
+/* 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 "GradientTableNode.h"
+#import "RandomCoreGraphicsNode.h"
+#import "AppDelegate.h"
+
+#import <AsyncDisplayKit/ASDisplayNode+Subclasses.h>
+
+#import <AsyncDisplayKit/ASStackLayoutSpec.h>
+#import <AsyncDisplayKit/ASInsetLayoutSpec.h>
+
+@interface GradientTableNode ()
+{
+  ASTableNode *_tableNode;
+  CGSize _elementSize;
+}
+
+@end
+
+
+@implementation GradientTableNode
+
+- (instancetype)initWithElementSize:(CGSize)size
+{
+  if (!(self = [super init]))
+    return nil;
+
+  _elementSize = size;
+
+  _tableNode = [[ASTableNode alloc] initWithStyle:UITableViewStylePlain];
+  [self addSubnode:_tableNode];
+  
+  return self;
+}
+
+- (void)didLoad
+{
+  [super didLoad];
+  _tableNode.view.asyncDelegate = self;
+  _tableNode.view.asyncDataSource = self;
+  
+  ASRangeTuningParameters rangeTuningParameters;
+  rangeTuningParameters.leadingBufferScreenfuls = 1.0;
+  rangeTuningParameters.trailingBufferScreenfuls = 0.5;
+  [_tableNode.view setTuningParameters:rangeTuningParameters forRangeType:ASLayoutRangeTypeRender];
+}
+
+- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
+{
+  return 100;
+}
+
+- (ASCellNode *)tableView:(ASTableView *)tableView nodeForRowAtIndexPath:(NSIndexPath *)indexPath
+{
+  RandomCoreGraphicsNode *elementNode = [[RandomCoreGraphicsNode alloc] init];
+  elementNode.preferredFrameSize = _elementSize;
+  return elementNode;
+}
+
+- (void)layout
+{
+  [super layout];
+  
+  _tableNode.frame = self.bounds;
+}
+
+@end
--- a/examples/VerticalWithinHorizontalScrolling/Sample/Info.plist
+++ b/examples/VerticalWithinHorizontalScrolling/Sample/Info.plist
@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>en</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>com.facebook.AsyncDisplayKit.$(PRODUCT_NAME:rfc1034identifier)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleSignature</key>
+	<string>????</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+	<key>LSRequiresIPhoneOS</key>
+	<true/>
+	<key>UIRequiredDeviceCapabilities</key>
+	<array>
+		<string>armv7</string>
+	</array>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+</dict>
+</plist>
--- a/examples/VerticalWithinHorizontalScrolling/Sample/RandomCoreGraphicsNode.h
+++ b/examples/VerticalWithinHorizontalScrolling/Sample/RandomCoreGraphicsNode.h
@ -0,0 +1,13 @@
+//
+//  RandomCoreGraphicsNode.h
+//  Sample
+//
+//  Created by Scott Goodson on 9/5/15.
+//  Copyright (c) 2015 Facebook. All rights reserved.
+//
+
+#import <AsyncDisplayKit/AsyncDisplayKit.h>
+
+@interface RandomCoreGraphicsNode : ASCellNode
+
+@end
--- a/examples/VerticalWithinHorizontalScrolling/Sample/RandomCoreGraphicsNode.m
+++ b/examples/VerticalWithinHorizontalScrolling/Sample/RandomCoreGraphicsNode.m
@ -0,0 +1,45 @@
+//
+//  RandomCoreGraphicsNode.m
+//  Sample
+//
+//  Created by Scott Goodson on 9/5/15.
+//  Copyright (c) 2015 Facebook. All rights reserved.
+//
+
+#import "RandomCoreGraphicsNode.h"
+#import <AsyncDisplayKit/ASDisplayNode+Subclasses.h>
+
+@implementation RandomCoreGraphicsNode
+
+ (UIColor *)randomColor
+{
+  CGFloat hue = ( arc4random() % 256 / 256.0 );  //  0.0 to 1.0
+  CGFloat saturation = ( arc4random() % 128 / 256.0 ) + 0.5;  //  0.5 to 1.0, away from white
+  CGFloat brightness = ( arc4random() % 128 / 256.0 ) + 0.5;  //  0.5 to 1.0, away from black
+  return [UIColor colorWithHue:hue saturation:saturation brightness:brightness alpha:1];
+}
+
+ (void)drawRect:(CGRect)bounds withParameters:(id<NSObject>)parameters isCancelled:(asdisplaynode_iscancelled_block_t)isCancelledBlock isRasterizing:(BOOL)isRasterizing
+{
+  CGFloat locations[3];
+  NSMutableArray *colors = [NSMutableArray arrayWithCapacity:3];
+  [colors addObject:(id)[[RandomCoreGraphicsNode randomColor] CGColor]];
+  locations[0] = 0.0;
+  [colors addObject:(id)[[RandomCoreGraphicsNode randomColor] CGColor]];
+  locations[1] = 1.0;
+  [colors addObject:(id)[[RandomCoreGraphicsNode randomColor] CGColor]];
+  locations[2] = ( arc4random() % 256 / 256.0 );
+
+  
+  CGContextRef ctx = UIGraphicsGetCurrentContext();
+  CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
+  CGGradientRef gradient = CGGradientCreateWithColors(colorSpace, (CFArrayRef)colors, locations);
+  
+  CGGradientDrawingOptions drawingOptions;
+  CGContextDrawLinearGradient(ctx, gradient, CGPointZero, CGPointMake(bounds.size.width, bounds.size.height), drawingOptions);
+  
+  CGGradientRelease(gradient);
+  CGColorSpaceRelease(colorSpace);
+}
+
+@end
--- a/examples/VerticalWithinHorizontalScrolling/Sample/ViewController.h
+++ b/examples/VerticalWithinHorizontalScrolling/Sample/ViewController.h
@ -0,0 +1,16 @@
+/* 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 <UIKit/UIKit.h>
+
+@interface ViewController : UIViewController
+
+@end
--- a/examples/VerticalWithinHorizontalScrolling/Sample/ViewController.m
+++ b/examples/VerticalWithinHorizontalScrolling/Sample/ViewController.m
@ -0,0 +1,100 @@
+/* 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 <AsyncDisplayKit/AsyncDisplayKit.h>
+#import <AsyncDisplayKit/ASAssert.h>
+
+#import "ViewController.h"
+#import "GradientTableNode.h"
+
+@interface ViewController () <ASCollectionViewDataSource, ASCollectionViewDelegate>
+{
+  ASCollectionView *_pagerView;
+}
+
+@end
+
+@implementation ViewController
+
+#pragma mark -
+#pragma mark UIViewController.
+
+- (instancetype)init
+{
+  if (!(self = [super init]))
+    return nil;
+
+  UICollectionViewFlowLayout *flowLayout = [[UICollectionViewFlowLayout alloc] init];
+  flowLayout.scrollDirection = UICollectionViewScrollDirectionHorizontal;
+//  flowLayout.itemSize = [[UIScreen mainScreen] bounds].size;
+  flowLayout.minimumInteritemSpacing = 0;
+  flowLayout.minimumLineSpacing = 0;
+  
+  _pagerView = [[ASCollectionView alloc] initWithCollectionViewLayout:flowLayout];
+  
+  ASRangeTuningParameters rangeTuningParameters;
+  rangeTuningParameters.leadingBufferScreenfuls = 1.0;
+  rangeTuningParameters.trailingBufferScreenfuls = 1.0;
+  [_pagerView setTuningParameters:rangeTuningParameters forRangeType:ASLayoutRangeTypeRender];
+  
+  _pagerView.pagingEnabled = YES;
+  _pagerView.asyncDataSource = self;
+  _pagerView.asyncDelegate = self;
+  
+  self.title = @"Paging Table Nodes";
+  self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemRedo
+                                                                                         target:self
+                                                                                         action:@selector(reloadEverything)];
+
+  return self;
+}
+
+- (void)reloadEverything
+{
+  [_pagerView reloadData];
+}
+
+- (void)viewDidLoad
+{
+  [super viewDidLoad];
+
+  [self.view addSubview:_pagerView];
+}
+
+- (void)viewWillLayoutSubviews
+{
+  _pagerView.frame = self.view.bounds;
+  _pagerView.contentInset = UIEdgeInsetsZero;
+}
+
+- (BOOL)prefersStatusBarHidden
+{
+  return YES;
+}
+
+#pragma mark -
+#pragma mark ASTableView.
+
+- (ASCellNode *)collectionView:(ASCollectionView *)collectionView nodeForItemAtIndexPath:(NSIndexPath *)indexPath;
+{
+  CGSize boundsSize = collectionView.bounds.size;
+  CGSize gradientRowSize = CGSizeMake(boundsSize.width, 100);
+  GradientTableNode *node = [[GradientTableNode alloc] initWithElementSize:gradientRowSize];
+  node.preferredFrameSize = boundsSize;
+  return node;
+}
+
+- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
+{
+  return (section == 0 ? 10 : 0);
+}
+
+@end
--- a/examples/VerticalWithinHorizontalScrolling/Sample/main.m
+++ b/examples/VerticalWithinHorizontalScrolling/Sample/main.m
@ -0,0 +1,20 @@
+/* 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 <UIKit/UIKit.h>
+
+#import "AppDelegate.h"
+
+int main(int argc, char * argv[]) {
+  @autoreleasepool {
+      return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
+  }
+}
				`@ -0,0 +1 @@`
				`<?xml version='1.0' encoding='UTF-8'?><Workspace version='1.0'><FileRef location='group:Sample.xcodeproj'/><FileRef location='group:Pods/Pods.xcodeproj'/></Workspace>`