title: Create iOS Action Extension with no UI
body: <p>I am trying to create an Action Extension similar to the system "Copy" action available in iOS.<br>
  I found different answers saying it's not possible to have non-fullscreen UI, but according to <a href="https://developer.apple.com/library/archive/documentation/General/Conceptual/ExtensibilityPG/index.html" rel="nofollow noreferrer">Apple Official Documentation</a> it is possible to have no UI (like in the Copy action, I presume).</p>
  
  <blockquote>
    <p>Action (iOS and macOS; UI and non-UI variants)</p>
  </blockquote>
  
  <p>I have tried creating a transparent view, but the result is always a fullscreen black overlay.<br>
  I have already specified <code>NSExtensionActionWantsFullScreenPresentation</code> to <code>NO</code> in my <code>Info.plist</code>, but nothing changes.</p>
  
  <p>Any idea about how to do it?</p>