React · SwiftUI · agent guides
Spinner
Steady work in a small space: a sunk round well with a lit green arc turning at a constant speed; it shows only after a beat so quick actions never flash it.
Use it for
- Inside or beside the control that started the work: a Save button while saving, a row while its preview loads.
Don't use it for
- Work whose amount you can show (use progress), or whole-page loading (show the page's shape and fill it in).