IBPCollectionViewCompositionalLayout is a backport of Apple's UICollectionViewCompositionalLayout APIs for older iOS versions. It allows applications targeting iOS 12 to adopt the compositional layout model introduced with iOS 13. Developers can define complex collection views from items, groups, sections, and dimensional rules instead of writing extensive custom layout subclasses. The same approach can create lists, grids, mosaics, nested groups, banners, and independently scrolling...