TOCropViewController is a mature, well-crafted iOS image cropping library that provides a full-screen crop UI modeled after the iOS Photos app editor. It supports rectangular and circular cropping, 90-degree rotation, aspect ratio presets, grid overlays, and custom presentation/dismissal animations. The library is implemented as two frameworks: an Objective-C core (TOCropViewController) and a Swift wrapper (CropViewController) that exposes a native Swift interface with closure-based callbacks. It is localized in 28 languages and supports iOS 12+, Mac Catalyst, and visionOS. The codebase demonstrates strong engineering practices including gesture-driven crop box resizing, safe area adaptation, and a clever delegate-to-closure bridge pattern in the Swift wrapper. However, it contains some deprecated patterns (manual rotation handling, UIActionSheet) and uses private API (reading display corner radius via valueForKey:), which introduces moderate technical drift. The library is actively maintained with recent releases (3.2.0) and extensive bug fixes.