swift iOS resize view on scroll

I have a VC with a navigation bar and then a uiview under it that acts as an extension to the navbar.

Then I have a embedded table view.

What I would like to do is to add a scroll recogniser to the container view that holds the table view so when I scroll down the uiview under the navigation bar should be hidden.

Is this possible? I have used self.navigationController?.setNavigationBarHidden(true, animated: true) In order to hide the navigation bar and that works. The problem is that I now need to hide the uiview under it. And I can't get it to work/feel smooth since just a hide/show functions looks strange. I would like it to be hidden the same speed as I scroll

via Chebli Mohamed