NSSlider

NSSlider is a user interface control in AppKit, the macOS UI framework, that presents a horizontal or vertical track with a draggable knob to select a numeric value within a defined range.

Developed as a subclass of NSControl, NSSlider is backed by an NSSliderCell. It exposes minValue, maxValue, and doubleValue for reading and setting the range and current value. The isContinuous flag controls whether changes are delivered continuously as the user drags the knob or only when the drag ends. For discrete input, you can configure a fixed number of tick marks with numberOfTickMarks to provide visual steps.

Usage and integration follow standard AppKit patterns. You can create an NSSlider in code or place one in Interface Builder, configure its minValue, maxValue, and initial value, and connect its action to a target to respond to changes. The slider uses the target-action mechanism common to AppKit controls. Its appearance and behavior can be further customized by its NSSliderCell, including tick marks and other visual attributes.

Notes: NSSlider is part of AppKit and is specific to macOS. In iOS, a similar control is UISlider, which is part of UIKit. NSSlider is commonly used for settings panels, media controls, and sliders that adjust continuous or stepped numeric parameters.