NSSlider object belongs to Apple's class it displays a range of values. NSSlider can be used for volume control, colors selection, brightness adjust, etc.. It has continous and discrete modes.
An NSSlider
object displays a range of values for something in the application. Sliders can be vertical or horizontal bars or circular dials. An indicator, or knob, notes the current setting. The user can move the knob in the slider’s bar—or rotate the knob in a circular slider to change the setting.
The NSSlider class uses the NSSliderCell
class to implement its user interface.