How to add shadow to UIView?

Question

For UIView I'm giving corner radius for two sides and adding drop shadow. Now, I'm getting corner radius for two sides but not shadow.

Here is the code which I have used:

@IBOutlet var myView: UIView!

override func viewDidLoad() {
    super.viewDidLoad()
   let shadowpath = UIBezierPath(roundedRect: CGRect(x: 0, y: 0, width: 
   myView.frame.height, height: myView.frame.height), byRoundingCorners: 
   [.topRight, .bottomRight], cornerRadii: CGSize(width: 58.0, height: 0.0))

    myView.layer.shadowColor = UIColor.black.cgColor
    myView.layer.shadowOffset = CGSize(width: 0.5, height: 0.4)  //Here you 
    control x and y
    myView.layer.shadowOpacity = 0.5
    myView.layer.shadowRadius = 5.0 //Here your control your blur
    myView.layer.masksToBounds =  false
    myView.layer.shadowPath = shadowpath.cgPath

Screenshot:

Answer 1

The key is to use a "container" view... you add a "shadow layer" as a Sublayer of the container view, and add the masked view as a Subview of the container.

Here is an example you can run in a Playground, that will give you just about what you've shown as your goal (you'll probably want to tweak the color values and shadow radius and offset):

import UIKit
import PlaygroundSupport

class TestViewController : UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        view.backgroundColor = UIColor.init(white: 0.8, alpha: 1.0)

        let myView = UIView(frame: CGRect(x: 0, y: 0, width: 200, height: 200))
        myView.backgroundColor = .white

        let mask = CAShapeLayer()

        let shadowpath = UIBezierPath(roundedRect: CGRect(x: 0, y: 0, width:
            myView.frame.height, height: myView.frame.height), byRoundingCorners:
            [.topRight, .bottomRight], cornerRadii: CGSize(width: 58.0, height: 0.0))

        mask.path = shadowpath.cgPath
        myView.layer.mask = mask

        let shadowLayer = CAShapeLayer()
        shadowLayer.frame = myView.bounds
        shadowLayer.path = shadowpath.cgPath
        shadowLayer.shadowOpacity = 0.5
        shadowLayer.shadowRadius = 5
        shadowLayer.shadowColor = UIColor(red: 0.2, green: 0.5, blue: 1.0, alpha: 1.0).cgColor
        shadowLayer.masksToBounds = false
        shadowLayer.shadowOffset = CGSize(width: 5.0, height: 1.0)

        let container = UIView(frame: CGRect(x: 40, y: 100, width: myView.bounds.width, height: myView.bounds.height))
        container.backgroundColor = .clear
        container.layer.addSublayer(shadowLayer)
        container.addSubview(myView)

        view.addSubview(container)

    }

}

let vc = TestViewController()
PlaygroundPage.current.liveView = vc

Result: