Returns the index of the tick mark closest to the location of the slider represented by the specified point.
- macOS 10.0+
The point representing the slider location.
The index of the tick mark closest to the specified location.
point is not within the bounding rectangle (plus an extra pixel of space) of any tick mark, the method returns
NSNot. This method calls
rect for each tick mark on the slider until it finds a tick mark containing