CHTCollectionViewWaterfallLayout is a UICollectionViewLayout subclass that implements a Pinterest-like waterfall layout for iOS and tvOS. It provides a configurable multi-column grid that arranges items of varying heights into the shortest column first, with support for per-section headers, footers, column counts, insets, and spacing. The library is implemented in both Swift and Objective-C, distributed via CocoaPods and Swift Package Manager, and requires iOS 13+ / tvOS 13+. It does not depend on any third-party frameworks and is designed to be a drop-in replacement for UICollectionViewFlowLayout when a waterfall arrangement is desired. The Swift implementation (v1.0.0) is a complete rewrite with modern API conventions and improved type safety.