Apple HIG Small Platforms: watchOS / tvOS / CarPlay / Game Design
Four small platforms in one. watchOS (timely and relevant · brief and efficient · Digital Crown as core · 3 navigation patterns: NavigationSplitView/TabView/NavigationStack · Series 7 three principles · large titles · 4 levels of full-screen materials · Smart Stack layout · Complications/Live Activities · watch faces: Dial/Infograph/List · full keyboard · Always-On Display (AOD) · secondary function controls) / tvOS (10 principles · content first · focus system · 5–10 Top Shelf items · avoid overstimulation · metadata as secondary · pagination arrows) / CarPlay (next-generation design system · modular instrument cluster · deep brand customization · SF variable fonts · dynamic content area · view area and safe area · automatic appearance based on time and vehicle conditions) / Games (core loop: Action-Reward-Expansion · 10 key principles: Be a Good Teacher / Remove Friction / Tune the Core Loop / Design for Touch / Foster Engagement / Background Transfers / Optimize Graphics / Introductory Videos / Localization / Use Cutting-Edge Technology · Touch-See-Hear-Feel perception loop · virtual joystick game input · adaptive layout anchors · Apple Games app + Game Center achievements/leaderboards/challenges/activities · time-limited in-app events for re-engagement).