Picture-frame using CAShapeLayer

gistfile1.txt

        import UIKit
        import PlaygroundSupport


        let bounds = CGRect(x: 0, y: 0, width: 400, height: 200)

        let uiview = UIView(frame: bounds)
        uiview.backgroundColor = UIColor.clear
        
        PlaygroundPage.current.liveView = uiview

        let shape = CGRect(x: 100, y: 50, width: 200, height: 100)


        let maskLayer = CAShapeLayer()
        maskLayer.frame = bounds
        maskLayer.path = UIBezierPath(roundedRect: shape, cornerRadius: 16).cgPath
        maskLayer.backgroundColor = UIColor.clear.cgColor
        maskLayer.fillRule = kCAFillRuleEvenOdd

        let frameview = UIView(frame: bounds)
        frameview.backgroundColor = UIColor.red.withAlphaComponent(0.8)
        frameview.layer.mask = maskLayer

        let baseview = UIView(frame: bounds)
        baseview.backgroundColor = UIColor.blue.withAlphaComponent(0.8)

        uiview.addSubview(baseview)
        uiview.insertSubview(frameview, aboveSubview: baseview)