A mask imageView class which can be used a scratchView

pod 'SRScratchView'

import SRScratchView

//Add delegate
class ViewController: UIViewController,SRScratchViewDelegate{

override func viewDidLoad() {
super.viewDidLoad()

self.scratchImageView.delegate = self

}


//delegate method
func scratchCardEraseProgress(eraseProgress: Float) {

//Here you will get erase progress in percentage

}
}

//width of srcatch line
yourView.lineWidth = 40.0

//shape of scrach line
yourView.lineType = .square