title: How detect subview is Button in UIHostingController - SwiftUI
body: <p>I need to get a button from the SwiftUI view that is wrapped in <code>UIHostingController</code>. In UIKit we simply could check the type in this way:</p>
  <pre><code>for (id subview in subviews) {
     if ([subview isKindOfClass:[UIButton class]]) {
        //do code for UIKit 
     }
  }
  </code></pre>
  <p>How should handle this for the SwiftUI view that added as a view in UIViewController?</p>