title: How to add system icons for a UIButton programmatically?
body: <p>It's easy to add a custom image or a background for a <code>UIButton</code> , but there seems to be no programmatic way to set one of the following default iOS icons for a <code>UIButton</code> , I know it can be applied to navigation bar buttons, I don't need that, I want to apply it to a simple <code>UIButton</code>, any hints?</p>
  <p><a href="https://i.stack.imgur.com/XRg6a.png" rel="noreferrer"><img src="https://i.stack.imgur.com/XRg6a.png" alt="enter image description here" /></a></p>