UITextView inside a UIScrollView in xamarin

I have created a contentview and in my pcl and in the IOS renderer I have created the below scrollview and textview, but I don't see anything in the page

 [assembly: ExportRenderer(typeof(SthotramView), typeof(SthotramViewRenderer))]
namespace Sthotraani.iOS.CustomControls
{
  public  class SthotramViewRenderer:ViewRenderer
    {
        UITextView utv;
        UIScrollView usv;
        protected override void OnElementChanged(ElementChangedEventArgs<Xamarin.Forms.View> e)
        {
            base.OnElementChanged(e);
            if (e.NewElement == null)
                retu;
            if (e.OldElement == null)
            {
                var sthotramView = Element as SthotramView;
                if (sthotramView.IsNotNull())
                {

                    utv = new UITextView();
                    utv.Selectable = false;
                    utv.Editable = false;
                    utv.Font = UIFont.FromName(sthotramView.FontFamily,(nfloat)sthotramView.FontSize);
                    utv.MultipleTouchEnabled = true;
                    utv.Text = sthotramView.Text;
                    usv = new UIScrollView(sthotramView.Bounds.ToRectangleF());
                    usv.MinimumZoomScale = sthotramView.MinimumZoomScale;
                    usv.MaximumZoomScale = sthotramView.MaximumZoomScale;
                    usv.AddSubview(utv);
                    usv.ViewForZoomingInScrollView = (UIScrollView sv) => { retu utv; };
                    SetNativeControl(usv);
                }
            }
        }
        protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
        {
            base.OnElementPropertyChanged(sender, e);
            var sthotramView = Element as SthotramView;
            if (sthotramView.IsNotNull())
            {
                if (e.PropertyName == "FontSize" || e.PropertyName == "FontFamily")
                    utv.Font = UIFont.FromName(sthotramView.FontFamily, (nfloat)sthotramView.FontSize);
                if (e.PropertyName == "Text")
                {
                    utv.Text = sthotramView.Text;
                    usv.SizeToFit();
                }
            }
        }


    }

I am not sure, what I am doing wrong. Please help me. I need to display large text with zoom capabilities that's why I choose this way. Earlier I used to have a xamarin label which always crashes due to memory issue with large text.