...It was designed to build with Xcode 7 and combines Swift and Objective-C source code. The project explores map customization, Core Image text detection, new filters, speech voices, and Audio Unit discovery. Interface examples cover UIStackView, spring animation, Safari View Controller, and system font additions. It also demonstrates Core Spotlight search, content blocker extensions, Low Power Mode detection, Contacts, and ReplayKit. Hardware-oriented samples include 3D Touch quick actions, force visualization, and Live Photos. The repository is now most valuable as a historical learning resource for understanding how these APIs were originally adopted.