UICollectionViewSplitLayout

UICollectionViewSplitLayout is a subclass of UICollectionViewLayout. It can divide sections into two columns.

Collection view has “Section” which organizes item collection. UICollectionViewFlowLayout places them from top to bottom.

On the other hands, UICollectionViewSplitLayout divides sections into two columns. You can dynamically update the width of them and which column each section is on.

For example, UICollectionViewSplitLayout can change the number of column according to device orientation. All you need is assigning value to leftSideRatio when changing screen size. This figure describes that a collection view has three sections (red, blue and green) and UICollectionViewSplitLayout aligns them side by side.