Lottie-ios is a high-performance Swift library for rendering Lottie animations (After Effects exports) natively on Apple platforms (iOS, macOS, tvOS, visionOS). It provides two rendering engines: a full-featured Main Thread engine and a GPU-accelerated Core Animation engine, with automatic fallback based on feature compatibility. The library offers UIKit (LottieAnimationView) and SwiftUI (LottieView) wrappers, interactive controls (AnimatedButton, AnimatedSwitch), dynamic property overrides via a value provider system, and support for the .lottie compressed archive format. It includes embedded, reusable libraries for ZIP archive handling (ZipFoundation), declarative UI model configuration (EpoxyCore), and LRU caching. The codebase is well-structured with extensive test coverage including snapshot tests, keypath logging, and performance benchmarks, and is actively maintained by Airbnb.