Getting System.InvalidCastException while loading View from a xib file

I have a xib file - LoaderView.xib and associated class LoaderView.cs which contains a view for showing loading text. When I try to load it in the main ViewController as -

public override void ViewDidAppear()
{
   base.ViewDidAppear();

   NSBundle.MainBundle.LoadNibNamed("LoaderView", this, out NSArray arr);
   var view = Runtime.GetNSObject<LoaderView>(arr.ValueAt(0));
   view.Frame = View.Frame;
   View.AddSubview(view);
}

I am getting the System.InvalidCastException in this line -

var view = Runtime.GetNSObject<LoaderView>(arr.ValueAt(0));

And the strange part is I do not get the exception every time. When it works, I am seeing the loading text overlapped with default view - associated with the ViewController.

Can someone point out what is the best way to show Loading, Error and Empty states. Should I have separate ViewControllers for them? Or Can I have separate xib files which I can load/unload from the main View Controller? How to load a view from a xib file?