NSCollectionLayoutSupplementaryItem 显示在单元格下方

Question

我使用 WWDC 中的代码添加了一个徽章。 但是徽章显示在单元格下方。 然后，如果我滚动，它会闪烁，有时会变得可见，有时会留在后面。 这是一个错误吗？

 let badgeAnchor = NSCollectionLayoutAnchor(edges: [.bottom, .trailing], fractionalOffset: CGPoint(x: 0.3, y: 0.3))
            let badgeSize = NSCollectionLayoutSize(widthDimension: .absolute(30),
                                                  heightDimension: .absolute(30))
            let badge = NSCollectionLayoutSupplementaryItem(
                layoutSize: badgeSize,
                elementKind: "Tick",
                containerAnchor: badgeAnchor)

            let item = NSCollectionLayoutItem(layoutSize: itemSize,supplementaryItems: [badge])
            group = NSCollectionLayoutGroup.horizontal(layoutSize: groupSize, subitem:item, count: sectionLayoutKind.columnCount)

Answer 1

经过一系列测试，将section.orthogonalScrollingBehavior改为continuous或者其他行为，会导致这个bug，应该向apple报告这个bug

let section = NSCollectionLayoutSection(group: group)
section.orthogonalScrollingBehavior = .continuous