Scratch Card effect in Swift 3

Question

I am trying to implement a Scratch Card effect in Swift 3 for my app, I found some examples but they\'re on Objective C (show scratch-card effect with the help of using scra

Answer 1

Check this Swift 3 example of ScratchCardImageView

A simple UIImageView subclass that allows your UIImageView become a scratch card.

Answer 2

I found a library that suits your requirement. It is Swift 3 compatible. Try this SRScratchView

ScreenShot

 var lineType: CGLineCap = .round
 var lineWidth: CGFloat = 30.0

 func scrachBetween(fromPoint: CGPoint, currentPoint: CGPoint) {

        UIGraphicsBeginImageContext(self.frame.size)

        image?.draw(in: self.bounds)

        let path = CGMutablePath()
        path.move(to: fromPoint)
        path.addLine(to: currentPoint)

        let context = UIGraphicsGetCurrentContext()!
        context.setShouldAntialias(true)
        context.setLineCap(lineType)
        context.setLineWidth(lineWidth)
        context.setBlendMode(.clear)
        context.addPath(path)

        context.strokePath()

        image = UIGraphicsGetImageFromCurrentImageContext()


        UIGraphicsEndImageContext()
    }

Answer 3

You can use ScratchCard library. It has simple API, but I don't know is it Swift 3 compatible. Anyway, you can rewrite it or check its implementation.