TabbedPage Tabbar not same color on both OS

Hi
I'm trying to color the tabs bar using BarBackgroundColor="Black" for this example.
Here is the result.

Working fine on Android, but iOS have obviously some tint or overlay applied, and i can't find how to remove it. Is there such a property?
Tried this custom renderer but no changes for BackgroundColor or BarTintColor.

public MyTabbarRenderer()
        {
            UITabBar.Appearance.TintColor = UIColor.Black;
            UITabBar.Appearance.BarTintColor = UIColor.Blue;
            UITabBar.Appearance.BackgroundColor = UIColor.Green;
        }

The final goal is to have a transparent tabbar (the only way i found to do this is to set the same color as the background of the page above) but with this tint difference it's not rendering as expected on iOS.