[ASCellNode] "selectedBackgroundView" property

AsyncDisplayKit/ASCellNode.h

@@ -169,6 +169,12 @@ typedef NS_ENUM(NSUInteger, ASCellNodeVisibilityEvent) {
  */
 @property (nonatomic) UITableViewCellSelectionStyle selectionStyle;
 
+/* @abstract The view used as the background of the cell when it is selected.
+ * ASTableView uses these properties when configuring UITableViewCells that host ASCellNodes.
+ * ASCollectionView uses these properties when configuring UICollectionViewCells that host ASCellNodes.
+ */
+@property (nonatomic, strong, nullable) UIView *selectedBackgroundView;
+
 /* @abstract The accessory type view on the right side of the cell. Please take care of your ASLayoutSpec so that doesn't overlay the accessoryView
  * @default UITableViewCellAccessoryNone
  * ASTableView uses these properties when configuring UITableViewCells that host ASCellNodes.

AsyncDisplayKit/ASCollectionView.mm

@@ -952,6 +952,7 @@ - (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cell
 
   if (_ASCollectionViewCell *asCell = ASDynamicCast(cell, _ASCollectionViewCell)) {
     asCell.node = node;
+    asCell.selectedBackgroundView = node.selectedBackgroundView;
     [_rangeController configureContentView:cell.contentView forCellNode:node];
   }
 

AsyncDisplayKit/ASTableView.mm

@@ -853,6 +853,7 @@ - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(N
     [_rangeController configureContentView:cell.contentView forCellNode:node];
 
     cell.node = node;
+    cell.selectedBackgroundView = node.selectedBackgroundView;
   }
 
   return cell;