Crop and shadow a view by adding a new layer

ViewController.swift

//
//  ViewController.swift
//  ViewCropAndShadow
//
//  Created by Wasim Alatrash on 5/22/18.
//  Copyright © 2018 Wasim Alatrash. All rights reserved.
//

import UIKit

class ViewController: UIViewController {
    
    @IBOutlet weak var LogoImageView: UIImageView!
    var tmpImage : UIImage = #imageLiteral(resourceName: "logo")
    let imageLayer  = CALayer()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        LogoImageView.layer.addSublayer(imageLayer)

    }
    
    override func viewDidLayoutSubviews() {

        super.viewDidLayoutSubviews()
        
        // add cornerRadius to the added layer
        imageLayer.frame = LogoImageView.bounds
        imageLayer.contents = tmpImage.cgImage
        imageLayer.cornerRadius = 20
        imageLayer.masksToBounds = true
        
        // add shadow to main layer
        LogoImageView.layer.shadowColor = UIColor.black.cgColor
        LogoImageView.layer.shadowOffset = CGSize(width: 4, height: 4)
        LogoImageView.layer.shadowRadius = 6
        LogoImageView.layer.cornerRadius = 20
        LogoImageView.backgroundColor = UIColor.lightGray

        
    }

}