Playground for Coupon like View (Concaved view)

CouponViewPlayground.swift

import UIKit
import PlaygroundSupport

let view = UIView(frame: CGRect(x: 0, y: 0, width: 375, height: 647))
view.backgroundColor = UIColor.white

let shadowView = UIView(frame: CGRect(x:50, y: 50, width:250, height:250))
view.addSubview(shadowView)
let someView = UIView(frame: CGRect(x:50, y: 50, width:250, height:250))
someView.backgroundColor = UIColor.white
view.addSubview(someView)

let shapeLayer = CAShapeLayer()
shapeLayer.frame = someView.bounds
shapeLayer.path = UIBezierPath(roundedRect: someView.bounds,
                               byRoundingCorners: [UIRectCorner.bottomLeft,UIRectCorner.bottomRight] ,
                               cornerRadii: CGSize(width: 5.0, height: 5.0)).cgPath


let rect = CGRect(x:0, y:0, width:200, height:100)
let cornerRadius:CGFloat = 5
let subPathSideSize:CGFloat = 25

let path = UIBezierPath(roundedRect: rect, cornerRadius: cornerRadius)
let leftSubPath = UIBezierPath(arcCenter: CGPoint(x: rect.width / 2, y: 0),
                               radius: subPathSideSize / 2, startAngle: .pi, endAngle: .pi * 0, clockwise: false)
leftSubPath.close()

let rightSubPath = UIBezierPath(arcCenter: CGPoint(x: rect.width / 2, y: rect.height),
                                radius: subPathSideSize / 2, startAngle: .pi, endAngle: .pi * 0, clockwise: true)
rightSubPath.close()

path.append(leftSubPath)
path.append(rightSubPath.reversing())

let mask = CAShapeLayer()
mask.frame = shapeLayer.bounds
mask.path = path.cgPath
someView.layer.mask = mask

let shadowMask = CAShapeLayer()
shadowMask.frame = shadowView.bounds
shadowMask.path = path.cgPath
shadowMask.shadowOpacity = 0.2
shadowMask.shadowRadius = 4
shadowMask.masksToBounds = false
shadowMask.shadowOffset = CGSize(width: 0, height: 2)

shadowView.backgroundColor = UIColor.clear
shadowView.layer.addSublayer(shadowMask)

let borderLayer = CAShapeLayer()
borderLayer.path = path.cgPath
borderLayer.strokeColor = UIColor.green.cgColor
borderLayer.fillColor = UIColor.clear.cgColor
borderLayer.lineWidth = 1
someView.layer.addSublayer(borderLayer)

view
PlaygroundPage.current.liveView = view