React · SwiftUI · agent guides
Slider
Scalar or range amounts on a clamped track: horizontal/vertical, centred or neutral fill, named independent knobs, step detents, transient value bubble, drum…
Use it for
- A value in a known range that a person sets by feel: zoom, volume, brightness, a quality level, a position in time.
Don't use it for
- An exact number someone types (use a number field), a level nobody sets (use a meter), or one of a few named options (use a switcher).