NSScroller object controls scrolling of a document view within the clip view of an
NSScroll instance (or potentially of another kind of container view). A scroller displays a slot containing a knob that the user can drag directly to the desired location. The knob indicates both the position within the document view and—by varying in size within the slot—the amount visible relative to the size of the document view.
- macOS 10.0+
Prior to OS X v10.7, an
NSScroller object can also optionally display scroll buttons. The scroll buttons are a pair of buttons that the user can click to scroll by a small amount (called a line increment or decrement) and Alt-click to scroll by a large amount (called a page increment or decrement).
Don’t use an scroller when a slider would be more appropriate. An
NSSlider object represents a range of values for something in the application and lets the user choose a setting. A scroller represents the relative position of the visible portion of a view and lets the user choose which portion to view.