Manually display nodes

Added a sample project that will demonstrate how to manually display nodes. Removed the UIWindow hack that coupled display of nodes with Core Animation transactions.

AsyncDisplayKit/Details/ASRangeController.mm

@@ -91,22 +91,6 @@
   return sizingQueue;
 }
 
-+ (UIView *)workingView
-{
-  // we add nodes' views to this invisible window to start async rendering
-  static UIWindow *workingWindow = nil;
-  static dispatch_once_t onceToken;
-  dispatch_once(&onceToken, ^{
-    workingWindow = [[UIWindow alloc] initWithFrame:CGRectZero];
-    workingWindow.windowLevel = UIWindowLevelNormal - 1000;
-    workingWindow.userInteractionEnabled = NO;
-    workingWindow.clipsToBounds = YES;
-    workingWindow.hidden = YES;
-  });
-
-  return workingWindow;
-}
-
 
 #pragma mark -
 #pragma mark Helpers.
@@ -191,7 +175,7 @@ static BOOL ASRangeIsValid(NSRange range)
   NSInteger index = [self indexForIndexPath:node.asyncdisplaykit_indexPath];
   if (NSLocationInRange(index, _workingRange)) {
     // move the node's view to the working range area, so its rendering persists
-    [self moveNodeToWorkingView:node];
+    [self moveNodeToWorkingRange:node];
   } else {
     // this node isn't in the working range, remove it from the view hierarchy
     [self removeNodeFromWorkingView:node];
@@ -205,20 +189,22 @@ static BOOL ASRangeIsValid(NSRange range)
 
   [node recursiveSetPreventOrCancelDisplay:YES];
   [node.view removeFromSuperview];
-  
+
   // since this class usually manages large or infinite data sets, the working range
   // directly bounds memory usage by requiring redrawing any content that falls outside the range.
   [node recursivelyReclaimMemory];
-  
+
   [_workingIndexPaths removeObject:node.asyncdisplaykit_indexPath];
 }
 
-- (void)moveNodeToWorkingView:(ASCellNode *)node
+- (void)moveNodeToWorkingRange:(ASCellNode *)node
 {
   ASDisplayNodeAssertMainThread();
   ASDisplayNodeAssert(node, @"invalid argument");
 
-  [self moveNode:node toView:[ASRangeController workingView]];
+  // if node is in the working range it should not actively be in view
+  [node.view removeFromSuperview];
+
   [_workingIndexPaths addObject:node.asyncdisplaykit_indexPath];
 }
 
@@ -231,7 +217,7 @@ static BOOL ASRangeIsValid(NSRange range)
   [CATransaction begin];
 
   [view addSubview:node.view];
-  
+
   [CATransaction commit];
 }
 
@@ -481,7 +467,7 @@ static NSRange ASCalculateWorkingRange(ASRangeTuningParameters params, ASScrollD
                                            _nodeSizes,
                                            [_delegate rangeControllerViewportSize:self]);
   }
-  
+
   [self setWorkingRange:workingRange];
 }
 
@@ -513,7 +499,7 @@ static NSRange ASCalculateWorkingRange(ASRangeTuningParameters params, ASScrollD
     // if a node in the working range is still sizing, the sizing logic will add it to the working range for us later
     ASCellNode *node = [self sizedNodeForIndexPath:indexPath];
     if (node) {
-      [self moveNodeToWorkingView:node];
+      [self moveNodeToWorkingRange:node];
     } else {
       ASDisplayNodeAssert(_sizedNodeCount != _totalNodeCount, @"logic error");
     }
@@ -577,6 +563,8 @@ static NSRange ASCalculateWorkingRange(ASRangeTuningParameters params, ASScrollD
       for (NSIndexPath *indexPath in indexPaths) {
         ASCellNode *node = _nodes[indexPath];
         _nodeSizes[[self indexForIndexPath:indexPath]] = [NSValue valueWithCGSize:node.calculatedSize];
+
+        [node display];
       }
       ASDisplayNodeAssert(_nodeSizes.count == _sizedNodeCount, @"logic error");