Hig Inputs

Comprehensive reference for every input method across Apple's platforms: touch gestures, Apple Pencil with pressure and tilt, keyboard shortcuts, game controllers, pointers, Digital Crown, eye tracking for visionOS, the focus system for tvOS, motion sensors, and spatial interactions. You get principle-driven guidance (support multiple inputs, consistent feedback, don't override system gestures) plus concrete specs for each method. Covers the tricky stuff like distinguishing Pencil from finger input, building the Command key overlay on iPad, and sizing hit targets for eye tracking. Most useful when you're adding controller support, implementing custom gestures, or adapting an app across platforms where input paradigms differ significantly.