This is your reference for Apple's selection and input controls: pickers, toggles, sliders, steppers, segmented controls, text fields, and the rest of the form component toolkit. It covers when to use each control type (toggles for binary states, segmented controls for 2-5 mutually exclusive options, sliders when precision doesn't matter), plus state management, validation timing, and accessibility labeling. The guidance is practical about platform differences, like combo boxes and token fields being macOS-only. If you're building forms or settings screens and need to know whether to use a picker or a segmented control, or what keyboard type to show for email input, this gives you the HIG answer with rationale.
npx skills add https://github.com/raintree-technology/apple-hig-skills --skill hig-components-controls