To handle native touch events on iOS, we are going to build a VisualElementRenderer. These work similar to CustomRenderers, but instead of rendering and replacing the entire control, we are able to render specific attributes, so we are able to attach native attributes to a Xamarin.Forms view.
Let's start with adding a new folder inside the Renderers folder called FocusView. Add in a new file called FocusViewRendererTouchAttribute.cs and implement the following:
public class FocusViewRendererTouchAttribute : VisualElementRenderer<FocusView>
{
public override void TouchesBegan (NSSet touches, UIEvent evt)
{
base.TouchesBegan (touches, evt);
FocusView focusView = ((FocusView)this.Element);
UITouch touch = touches.AnyObject as UITouch;
if (touch != null)
{
var posc = touch.LocationInView...