Provided support for iOS 13 Context Menus

Examples/Examples-iOS/IGListKitExamples/SectionControllers/MonthSectionController.swift

@@ -92,4 +92,26 @@ final class MonthSectionController: ListBindingSectionController<ListDiffable>,
 
     func sectionController(_ sectionController: ListBindingSectionController<ListDiffable>, didUnhighlightItemAt index: Int, viewModel: Any) {}
 
+    @available(iOS 13.0, *)
+    func sectionController(_ sectionController: ListBindingSectionController<ListDiffable>, contextMenuConfigurationForItemAt index: Int, point: CGPoint, viewModel: Any) -> UIContextMenuConfiguration? {
+      return UIContextMenuConfiguration(identifier: nil, previewProvider: nil) { _ in
+          // Create an action for sharing
+        let share = UIAction(title: "Share", image: UIImage(systemName: "square.and.arrow.up")) { _ in
+            // Show share sheet
+        }
+
+        // Create an action for copy
+        let rename = UIAction(title: "Copy", image: UIImage(systemName: "doc.on.doc")) { _ in
+            // Perform copy
+        }
+
+        // Create an action for delete with destructive attributes (highligh in red)
+        let delete = UIAction(title: "Delete", image: UIImage(systemName: "trash"), attributes: .destructive) { _ in
+            // Perform delete
+        }
+
+        // Create a UIMenu with all the actions as children
+        return UIMenu(title: "", children: [share, rename, delete])
+    }
+  }
 }

Source/IGListKit/IGListBindingSectionController.m

@@ -154,4 +154,10 @@ - (void)didUnhighlightItemAtIndex:(NSInteger)index {
     [self.selectionDelegate sectionController:self didUnhighlightItemAtIndex:index viewModel:self.viewModels[index]];
 }
 
+#if !TARGET_OS_TV
+- (nullable UIContextMenuConfiguration *)contextMenuConfigurationForItemAtIndex:(NSInteger)index point:(CGPoint)point {
+    return [self.selectionDelegate sectionController:self contextMenuConfigurationForItemAtIndex:index point:point viewModel:self.viewModels[index]];
+}
+#endif
+
 @end

Source/IGListKit/IGListBindingSectionControllerSelectionDelegate.h

@@ -61,6 +61,21 @@ NS_SWIFT_NAME(ListBindingSectionControllerSelectionDelegate)
 didUnhighlightItemAtIndex:(NSInteger)index
                 viewModel:(id)viewModel;
 
+/**
+ Tells the delegate that a cell has requested a menu configuration.
+
+ @param sectionController The section controller the request of a menu configuration occurred in.
+ @param index The index of the cell that is being longed tap.
+ @param point The point of the tap on the cell.
+ @param viewModel The view model that was bound to the cell.
+ 
+ @return An object that conforms to `UIContextMenuConfiguration`.
+ */
+- (nullable UIContextMenuConfiguration *)sectionController:(IGListBindingSectionController *)sectionController
+                    contextMenuConfigurationForItemAtIndex:(NSInteger)index
+                                                     point:(CGPoint)point
+                                                 viewModel:(id)viewModel API_AVAILABLE(ios(13.0)) API_UNAVAILABLE(tvos);
+
 @end
 
 NS_ASSUME_NONNULL_END

Source/IGListKit/IGListSectionController.h

@@ -129,6 +129,18 @@ NS_SWIFT_NAME(ListSectionController)
  */
 - (void)didUnhighlightItemAtIndex:(NSInteger)index;
 
+/**
+ Tells the section controller that the cell has requested a menu configuration.
+ 
+ @param index The index of the cell that requested the menu.
+ @param point The point of the tap on the cell.
+ 
+ @return An object that conforms to `UIContextMenuConfiguration`
+ 
+ @note The default implementation does nothing. **Calling super is not required.**
+ */
+- (nullable UIContextMenuConfiguration *)contextMenuConfigurationForItemAtIndex:(NSInteger)index point:(CGPoint)point API_AVAILABLE(ios(13.0)) API_UNAVAILABLE(tvos);
+
 /**
  Identifies whether an object can be moved through interactive reordering.
 

Source/IGListKit/IGListSectionController.m

@@ -101,6 +101,10 @@ - (void)didHighlightItemAtIndex:(NSInteger)index {}
 
 - (void)didUnhighlightItemAtIndex:(NSInteger)index {}
 
+- (nullable UIContextMenuConfiguration *)contextMenuConfigurationForItemAtIndex:(NSInteger)index point:(CGPoint)point {
+  return nil;
+}
+
 - (BOOL)canMoveItemAtIndex:(NSInteger)index {
     return NO;
 }

Source/IGListKit/Internal/IGListAdapter+UICollectionView.m

@@ -279,6 +279,19 @@ - (void)collectionView:(UICollectionView *)collectionView didUnhighlightItemAtIn
     [sectionController didUnhighlightItemAtIndex:indexPath.item];
 }
 
+#if !TARGET_OS_TV
+- (UIContextMenuConfiguration *)collectionView:(UICollectionView *)collectionView contextMenuConfigurationForItemAtIndexPath:(NSIndexPath *)indexPath point:(CGPoint)point API_AVAILABLE(ios(13.0)) {
+  // forward this method to the delegate b/c this implementation will steal the message from the proxy
+  id<UICollectionViewDelegate> collectionViewDelegate = self.collectionViewDelegate;
+  if ([collectionViewDelegate respondsToSelector:@selector(collectionView:contextMenuConfigurationForItemAtIndexPath:point:)]) {
+      [collectionViewDelegate collectionView:collectionView contextMenuConfigurationForItemAtIndexPath:indexPath point:point];
+  }
+
+  IGListSectionController * sectionController = [self sectionControllerForSection:indexPath.section];
+  return [sectionController contextMenuConfigurationForItemAtIndex:indexPath.item point:point];
+}
+#endif
+
 #pragma mark - UICollectionViewDelegateFlowLayout
 
 - (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath {

Source/IGListKit/Internal/IGListAdapterProxy.m

@@ -35,6 +35,7 @@ static BOOL isInterceptedSelector(SEL sel) {
             sel == @selector(collectionView:didDeselectItemAtIndexPath:) ||
             sel == @selector(collectionView:didHighlightItemAtIndexPath:) ||
             sel == @selector(collectionView:didUnhighlightItemAtIndexPath:) ||
+            sel == @selector(collectionView:contextMenuConfigurationForItemAtIndexPath:point:) ||
             // UICollectionViewDelegateFlowLayout
             sel == @selector(collectionView:layout:sizeForItemAtIndexPath:) ||
             sel == @selector(collectionView:layout:insetForSectionAtIndex:) ||