i am developing an image edittor app for IOS.How can i add an eraser option?

Question

Currently i am adding the changes as subview to the original image. I want to add an eraser tool so that when the user draws on the screen, the subviews will be cleared and the underlined image will be seen . Same as an eraser tool in "Paint".Below is the code used for drawing a rectangle.How can i add an eraser tool using the same method. Thank you

case 2:
            let path = UIBezierPath()
            let sh = CAShapeLayer()
            sh.strokeColor = selectedcolor.cgColor
            sh.lineWidth = 3
            sh.fillColor = UIColor.clear.cgColor
            tempImage.layer.sublayers?.removeAll()
            sh.fillColor = UIColor.clear.cgColor
            path.move(to: startPoint)
            sh.path = UIBezierPath(rect: rect).cgPath
            tempImage.layer.addSublayer(sh)
            if usermoving == 0
            {
                sh.setValue(tag, forKey: "tag")
                mainImage.layer.addSublayer(sh)  
             }
            break

Same question asked in some other :- https://stackoverflow.com/questions/6177490/erase-line-drawing-with-uibezierpath — user1376400, Oct 23 '18 at 13:02

score 0 · Answer 1 · answered Oct 23 '18 at 13:11

0

Its Objective C Code

If you are using an image as background then you can set the same image as brush pattern to draw the bezierpath it will virtually give you the eraser effect.

Swift:-

UIColor(patternImage: UIImage(named: "background.png"))

answered Oct 23 '18 at 13:11

user1376400

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I have tried this, but the image coming is not perfectly aligned with the bottom image – Faheem Rahman Oct 24 '18 at 04:30

i am developing an image edittor app for IOS.How can i add an eraser option?

1 Answers1