iOS Setup NavBar

SetupNavBar.cs

 void SetupNavBar(CGSize size)
{
            if (NavigationController != null && titleView != null)
            {
                var page = Element as Page;
                containerView.Frame = new CGRect(0, 0, size.Width, size.Height);

                titleView.Layer.BorderWidth = CustomNavigationPage.GetTitleBorderWidth(Element);

                titleView.Layer.CornerRadius = CustomNavigationPage.GetTitleBorderCornerRadius(Element);

                titleView.Layer.BorderColor = CustomNavigationPage.GetTitleBorderColor(Element)?.ToCGColor() ?? UIColor.Clear.CGColor;

                SetupTextFont(titleLabel, CustomNavigationPage.GetTitleFont(page), CustomNavigationPage.GetTitleColor(page));

                SetupBackground();

                if (!string.IsNullOrEmpty(CustomNavigationPage.GetTitleBackground(Element)))
                {
                    try
                    {

                        var image = UIImage.FromBundle(CustomNavigationPage.GetTitleBackground(Element));
                        titleView.Frame = new CGRect(titleView.Frame.X, titleView.Frame.Y, titleView.Frame.Width == 0?Math.Min(size.Width,image.Size.Width): Math.Min(titleView.Frame.Width, image.Size.Width), titleView.Frame.Height == 0 ? Math.Min(size.Height, image.Size.Height) : Math.Min(titleView.Frame.Height, image.Size.Height));
                      
                        titleView.BackgroundColor = UIColor.FromPatternImage(image);
                
                    }
                    catch (Exception ex)
                    {
                        titleView.BackgroundColor = CustomNavigationPage.GetTitleFillColor(Element)?.ToUIColor() ?? UIColor.Clear;

                    }

                }
                else
                {
                    titleView.BackgroundColor = CustomNavigationPage.GetTitleFillColor(Element)?.ToUIColor() ?? UIColor.Clear;
                }

           
                ParentViewController.NavigationItem.TitleView = containerView;
                ParentViewController.NavigationItem.TitleView.SetNeedsDisplay();
            }
}