zOffset
A value that represents the normalized distance between the screen and a hovering pointing device, such as Apple Pencil.
Declaration
var zOffset: CGFloat { get }Discussion
This value is 1 at the maximum distance from the screen and approaches 0 as the pointing device gets closer to the screen. This value is 0 for devices that don’t support zOffset.
For example, a drawing app might use the value of this property to generate a preview that indicates where a hovering Apple Pencil touches down on an iPad screen. For more information, see Adopting hover support for Apple Pencil.