pod "MCScratchImageView"

import MCScratchImageView

var scratchImageView: MCScratchImageView!

// init()
scratchImageView = MCScratchImageView()
// init(frame:)
scratchImageView = MCScratchImageView(frame: yourRect)

// use default touch point radius
scratchImageView.setMaskImage(yourUIImage)
// use custom touch point radius
scratchImageView.setMaskImage(yourUIImage, spotRadius: 100)

// set the delegate
scratchImageView.delegate = ***

/* ... */

// implement the MCScratchImageViewDelegate method
extension YourController: MCScratchImageViewDelegate {
    
    func mcScratchImageView(_ mcScratchImageView: MCScratchImageView, didChangeProgress progress: CGFloat) {
        print("Progress did changed: " + String(format: "%.2f", progress))
        if (progress >= 0.8) {
            mcScratchImageView.scratchAll()
        }
    }
    
}

// current scratched progress
public var progress: CGFloat
// Determin the radius of the touch point
private(set) var spotRadius: CGFloat = 45.0

// set the mask image & radius
public func setMaskImage(_ image: UIImage)
public func setMaskImage(_ image: UIImage, spotRadius: CGFloat)

// scratch all mask fields
public func scratchAll()