滚动LoadNib UIView时出现问题，它在UIScrollView中

我正在使用Xamarin工具，并试图使用LoadNib加载视图，然后将其添加到UIScrollView。我做错了什么。视图显示出来了，但我无法让它滚动。代码如下。我做错了什么?

public override void ViewDidLoad ()
{
    base.ViewDidLoad ();
    // Perform any additional setup after loading the view, typically from a nib.
    scrollView = new UIScrollView (
        new RectangleF (0, 0, View.Frame.Width
                    , View.Frame.Height - NavigationController.NavigationBar.Frame.Height));
    View.AddSubview (scrollView);
    var arr = NSBundle.MainBundle.LoadNib("AboutView", this, null);
    var v = Runtime.GetNSObject(arr.ValueAt(0)) as UIView;
    scrollView.ContentSize = v.Frame.Size;
    scrollView.AddSubview(v);
 }

this. scrollView.ContentOffset = new PointF(320,480);
SizeF size = new SizeF(320,315);
this.scrollMonth.ContentSize = size; 
this.viewNewRecord.Hidden = false;