iOS invert mask in drawRect

Question

With the code below, I am successfully masking part of my drawing, but it\'s the inverse of what I want masked. This masks the inner portion of the drawing, where I would li

Answer 1

Here's my Swift 4.2 solution that allows a corner radius

extension UIView {

    func mask(withRect maskRect: CGRect, cornerRadius: CGFloat, inverse: Bool = false) {
        let maskLayer = CAShapeLayer()
        let path = CGMutablePath()
        if (inverse) {
            path.addPath(UIBezierPath(roundedRect: self.bounds, cornerRadius: cornerRadius).cgPath)
        }
        path.addPath(UIBezierPath(roundedRect: maskRect, cornerRadius: cornerRadius).cgPath)

        maskLayer.path = path
        if (inverse) {
            maskLayer.fillRule = CAShapeLayerFillRule.evenOdd
        }

        self.layer.mask = maskLayer;
    }

}