NavigationRender Issue

Hi,
I used below code for my custom navigation renderer in Xamarin.Forms App. But due to this extra blank space(Black Color) left at the bottom of the screen. Please have a look in the attached screenshot
public class NavigationPageRenderer : NavigationRenderer
{
public override void ViewDidLoad ()
{
base.ViewDidLoad ();
this.NavigationBar.Translucent = true;
}
}