Erasure your Image if you set.
Use it on the StoryBoard
@IBOutlet weak var rubberView: RubberView!
Or Init it
let rect = CGRect(x: 0, y: 0, width: 100, height: 100)
let rubber = RubberView(frame: rect)
Set Source Image
rubber.sourceImage = UIImage(named: "AAA.jpg")
Set Clear Radius
rubber.clearRadius = 10
// default is 5