Update the PageRenderer class so that it can render as a custom UIViewController instead of just a UIViewController
I propose two ways of doing this.
Make PagerRenderer generic, so the user can set the page like so:
CustomPageRenderer : PageRenderer
or, add a SetNativeControl() function so the user can set what control to render as, such as:
var myPage = new MyCustomUIViewController();
There are a lot of libraries out there that are just classes that inherent from UIViewController, we can't really use them since PageRenderer will only render a Xamarin forms page as a UIViewController.