title: Getting content offset of List in SwiftUI
body: <p>I'm trying to create a parallax header effect in SwiftUI like this one <a href="https://twitter.com/KhaosT/status/1140814602017464320" rel="noreferrer">https://twitter.com/KhaosT/status/1140814602017464320</a> , but don't really know how to get content offset of the list while scrolling.</p>
  
  <p>Does anyone have know how to calculate the content offset of the list while scrolling?</p>