An interface you use to detect when the user changes the selected tools and drawing characteristics of a tool picker object.
- iOS 13.0+Beta
Implement the methods of
PKTool to detect when the user changes the configuration of a
PKTool view. Each time the user changes the selected tool or other drawing characteristics, the tool picker notifies any registered observers. You use these notifications to update the configuration of the underlying canvas.
To register an observer with a tool picker, call the
add method of the