PKTool
An abstract base class for tools used by a canvas view.
Declaration
@interface PKTool : NSObjectOverview
A PKTool object is an abstract base class for tool types associated with a PKCanvasView. Tools are user-facing, and the selected tool determines how the canvas interprets incoming gestures.
Don’t create PKTool objects directly. Instead, create one of its subclasses to provide users with the desired the tool behavior.