Prevent calling unsupported UICollectionViewDelegate methods (supplementary view appearance)

Author: Scott Goodson

AsyncDisplayKit/ASCellNode.m

@@ -63,13 +63,6 @@ - (instancetype)initWithViewControllerBlock:(ASDisplayNodeViewControllerBlock)vi
   return self;
 }
 
-//- (ASLayoutSpec *)layoutSpecThatFits:(ASSizeRange)constrainedSize
-//{
-//  _viewControllerNode.frame = (CGRect){{0,0}, constrainedSize.max};
-//  NSLog(@"%f %f", constrainedSize.max.width, constrainedSize.max.height);
-//  return [super layoutSpecThatFits:constrainedSize];
-//}
-
 - (void)layout
 {
   [super layout];

AsyncDisplayKit/ASCollectionView.mm

@@ -944,6 +944,16 @@ - (void)collectionView:(UICollectionView *)collectionView moveItemAtIndexPath:(N
   ASDisplayNodeAssert(![self.asyncDataSource respondsToSelector:_cmd], @"%@ is not supported by ASCollectionView - please remove or disable this data source method.", NSStringFromSelector(_cmd));
 }
 
+- (void)collectionView:(UICollectionView *)collectionView willDisplaySupplementaryView:(UICollectionReusableView *)view forElementKind:(NSString *)elementKind atIndexPath:(NSIndexPath *)indexPath
+{
+  ASDisplayNodeAssert(![self.asyncDataSource respondsToSelector:_cmd], @"%@ is not supported by ASCollectionView - please remove or disable this delegate method.", NSStringFromSelector(_cmd));
+}
+
+- (void)collectionView:(UICollectionView *)collectionView didEndDisplayingSupplementaryView:(UICollectionReusableView *)view forElementOfKind:(NSString *)elementKind atIndexPath:(NSIndexPath *)indexPath
+{
+  ASDisplayNodeAssert(![self.asyncDataSource respondsToSelector:_cmd], @"%@ is not supported by ASCollectionView - please remove or disable this delegate method.", NSStringFromSelector(_cmd));
+}
+
 #endif
 
 @end

AsyncDisplayKit/Details/ASDelegateProxy.m

@@ -58,7 +58,9 @@ - (BOOL)interceptsSelector:(SEL)selector
 
           // intercepted due to not being supported by ASCollectionView (prevent bugs caused by usage)
           selector == @selector(collectionView:canMoveItemAtIndexPath:) ||
-          selector == @selector(collectionView:moveItemAtIndexPath:toIndexPath:)
+          selector == @selector(collectionView:moveItemAtIndexPath:toIndexPath:) ||
+          selector == @selector(collectionView:willDisplaySupplementaryView:forElementKind:atIndexPath:) ||
+          selector == @selector(collectionView:didEndDisplayingSupplementaryView:forElementOfKind:atIndexPath:)
           );
 }
 

examples/CustomCollectionView/Sample/ViewController.m

@@ -54,7 +54,7 @@ - (instancetype)init
 
   _layoutInspector = [[MosaicCollectionViewLayoutInspector alloc] init];
 
-  _collectionView = [[ASCollectionView alloc] initWithFrame:CGRectZero collectionViewLayout:layout asyncDataFetching:YES];
+  _collectionView = [[ASCollectionView alloc] initWithFrame:CGRectZero collectionViewLayout:layout];
   _collectionView.asyncDataSource = self;
   _collectionView.asyncDelegate = self;
   _collectionView.layoutInspector = _layoutInspector;