title: How to set UIHostingController's background color to clear?
body: <p>I need to be able to see through my SwiftUI Views as well as the UIHosting Controller presenting them in order to see a background image underneath them.  The code below still shows a white rectangle under my SwiftUI View.  Paul Hudson <a href="https://www.hackingwithswift.com/books/ios-swiftui/what-is-behind-the-main-swiftui-view" rel="noreferrer">says</a> to use edgesIgnoringSafeArea but I cannot use that as my SwiftUIView is embedded in a larger UI scheme.  Is there any way to make this white rectangle I am seeing clear?</p>
  <pre><code>    var body: some View {
            ZStack {
              VStack {
                   //omitted
                }
          }.background(Color.clear)
     }
  </code></pre>