title: Add shadow to image in UIKit
body: <p>I have this screen with an <code>UIImageView</code> (the image is a <strong>SF Symbol</strong>)</p>
  <img src="https://i.stack.imgur.com/KT4QH.png" width="200">
  <p>The user can see this icon clearly, white on black. But - if the background is different:</p>
  <img src="https://i.stack.imgur.com/ZmQTl.png" width="200">
  <p>It may be hard to see it.
  I want to add a <strong>black shadow</strong> to the image so the user can see it better.</p>
  <p>I tried looking online but all I saw is how to add shadow to the image view box, and that is not what I need. I need the shadow around the icon itself and not around the box of the image.</p>
  <p>Any ideas? thanks in advance</p>