MKCircleView class provides the visual representation for an
MKCircle annotation object. This view fills and strokes the circle represented by the annotation. You can change the color and other drawing attributes of the circle by modifying the properties inherited from the
MKOverlayPathView class. This class is typically used as is and not subclassed.
- iOS 4.0+
Use of this class is discouraged in iOS 7 and later. Use the
MKCircleRenderer class instead.