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.

TOSegmentedControl is an iOS UI library that reimplements the modern UISegmentedControl appearance from iOS 13+ for backward compatibility with older iOS versions (back to iOS 9). The library consists of a main control class (TOSegmentedControl) that manages the overall appearance and behavior, and a segment class (TOSegmentedControlSegment) that represents individual items. It supports both text and image segments, dynamic addition/removal of items, configurable appearance (colors, fonts, corner radius), and special features like 'reversible' segments that toggle direction when tapped. The implementation includes sophisticated touch handling with spring-based animations, custom layout management, and proper adaptation to system appearance changes (dark/light mode).