Ios Renderer wrong children frame

Hi, I'm trying to create a popover implementation in my xamarin forms app. I want to be able to show a xamarin forms' view in an iOS Popover but I'm not able to render my view correctly.

Here's my Xamarin Forms code :

var content = new ContentView
{
    BackgroundColor = Color.Coral,
    WidthRequest = 300,
    HeightRequest = 60,
    Content = new Label
    {
        Text = "Text in Popover",
        TextColor = Color.Black,
        VerticalOptions = LayoutOptions.CenterAndExpand,
        HorizontalOptions = LayoutOptions.CenterAndExpand,
        BackgroundColor = Color.Yellow
    }
};
PopoverManager.ShowPopover(this, content, (Button)sender);

And this is iOS Part :

        public void ShowPopover(Page page, VisualElement content, VisualElement origine)
        {
            var viewController = Platform.GetRenderer(page).ViewController;
            var viewOrigine = Platform.GetRenderer(origine).NativeView;

            var rect = viewController.View.ConvertRectFromView(viewOrigine.Frame, viewOrigine.Superview);

            UIViewController popoverVc = new UIViewController
            {
                ModalPresentationStyle = UIModalPresentationStyle.Popover
            };

            popoverVc.View = GetUIView(content);
            popoverVc.PopoverPresentationController.SourceView = viewController.View;
            popoverVc.PopoverPresentationController.SourceRect = rect;
            popoverVc.PreferredContentSize = popoverVc.View.Frame.Size;
            popoverVc.PopoverPresentationController.BackgroundColor = popoverVc.View.BackgroundColor;

            viewController.PresentViewController(popoverVc, true, null);
        }

        public static UIView GetUIView(VisualElement view)
        {

            if (Platform.GetRenderer(view) == null)
                Platform.SetRenderer(view, Platform.CreateRenderer(view));

            var vRenderer = Platform.GetRenderer(view);

            var minSize = vRenderer.Element.Measure(double.PositiveInfinity, double.PositiveInfinity, MeasureFlags.IncludeMargins);
            var rect = new Rectangle(Point.Zero, minSize.Request);

            CGRect size = rect.ToRectangleF();

            vRenderer.NativeView.Frame = size;

            vRenderer.NativeView.TranslatesAutoresizingMaskIntoConstraints = true;
            vRenderer.NativeView.AutoresizingMask = UIViewAutoresizing.All;
            vRenderer.NativeView.ContentMode = UIViewContentMode.ScaleToFill;

            vRenderer.Element?.Layout(size.ToRectangle());

            var nativeView = vRenderer.NativeView;

            nativeView.SetNeedsLayout();
            nativeView.SetNeedsDisplay();

            return nativeView;
        }

Popover presentation works fine and show the contentView with the right size but my Label have a frame equal to 0.

I think I'm missing something to render correctly all children.
My goal is to have more complexe views in popover and I don't want to manually setup size of each children.

Best regards