ios - UICollectionView 标头影响预取项目

Question

在 UICollectionView 中使用UICollectionViewFlowLayout sectionHeadersPinToVisibleBounds = true时，UICollectionViewDataSourcePrefetching 的funcprefetchItemsAt indexPaths总是重复 indexPaths，例如：

collectionView(_:prefetchItemsAt:) [[0, 4], [0, 5], [0, 6], [0, 7]]
collectionView(_:prefetchItemsAt:) [[0, 4], [0, 5], [0, 6], [0, 7]]
collectionView(_:prefetchItemsAt:) [[0, 4], [0, 5], [0, 6], [0, 7]]
collectionView(_:prefetchItemsAt:) [[0, 4], [0, 5], [0, 6], [0, 7]]
collectionView(_:prefetchItemsAt:) [[0, 4], [0, 5], [0, 6], [0, 7]]
collectionView(_:prefetchItemsAt:) [[0, 4], [0, 5], [0, 6], [0, 7]]
collectionView(_:prefetchItemsAt:) [[0, 4], [0, 5], [0, 6], [0, 7]]
collectionView(_:prefetchItemsAt:) [[0, 4], [0, 5], [0, 6], [0, 7]]

当indexPaths的删除sectionHeadersPinToVisibleBounds = true（或将值设置为）数组在以下位置变得正确时：falseprefetchItemsAt indexPaths

collectionView(_:prefetchItemsAt:) [[0, 4], [0, 5], [0, 6], [0, 7]]
collectionView(_:prefetchItemsAt:) [[0, 4], [0, 5], [0, 6], [0, 7]]
collectionView(_:prefetchItemsAt:) [[0, 8], [0, 9]]
collectionView(_:prefetchItemsAt:) [[0, 10], [0, 11]]
collectionView(_:prefetchItemsAt:) [[0, 12], [0, 13]]
collectionView(_:prefetchItemsAt:) [[0, 14], [0, 15]]
collectionView(_:prefetchItemsAt:) [[0, 16], [0, 17]]

你能告诉我如何解决这个问题吗？