expose relayoutAllNodes at ASCollectionView level (#1683)

* expose relayoutAllNodes at ASCollectionView level

* rename relayoutAllNodes to relayoutItems to be more UIKit centric

AsyncDisplayKit/ASCollectionView.h

@@ -164,6 +164,12 @@ NS_ASSUME_NONNULL_BEGIN
  */
 - (void)reloadDataImmediately;
 
+/**
+ * Triggers a relayout of all nodes.
+ *
+ */
+- (void)relayoutItems;
+
 /**
  *  Blocks execution of the main thread until all section and row updates are committed. This method must be called from the main thread.
  */

AsyncDisplayKit/ASCollectionView.mm

@@ -313,6 +313,11 @@ static NSString * const kCellReuseIdentifier = @"_ASCollectionViewCell";
   [super reloadData];
 }
 
+- (void)relayoutItems
+{
+  [_dataController relayoutAllNodes];
+}
+
 - (void)waitUntilAllUpdatesAreCommitted
 {
   ASDisplayNodeAssertMainThread();

AsyncDisplayKit/ASTableView.h

@@ -134,6 +134,12 @@ NS_ASSUME_NONNULL_BEGIN
  */
 - (void)reloadDataImmediately;
 
+/**
+ * Triggers a relayout of all nodes.
+ *
+ */
+- (void)relayoutItems;
+
 /**
  *  begins a batch of insert, delete reload and move operations. This method must be called from the main thread.
  */

AsyncDisplayKit/ASTableView.mm

@@ -354,6 +354,11 @@ static NSString * const kCellReuseIdentifier = @"_ASTableViewCell";
   [super reloadData];
 }
 
+- (void)relayoutItems
+{
+  [_dataController relayoutAllNodes];
+}
+
 - (void)setTuningParameters:(ASRangeTuningParameters)tuningParameters forRangeType:(ASLayoutRangeType)rangeType
 {
   [_layoutController setTuningParameters:tuningParameters forRangeMode:ASLayoutRangeModeFull rangeType:rangeType];