swift - iOS中这种界面该如果实现？

Question

主要是红色区域会随着下面列表的滚动而隐藏显示，
这功能如何实现？界面如何布局？

Answer 1

In the delegate of scrollview, decide whether to hide or display based on the current scrolling direction and the position of the current red view.

Answer 2

UICollectionView