StoryboardHelper.cs

using System;
using System.Runtime.InteropServices;
using Foundation;
using UIKit;
using ObjCRuntime;

namespace Workaround {

	public static class StoryboardHelper
	{
		[DllImport (Constants.ObjectiveCLibrary, EntryPoint = "objc_msgSend")]
		public static extern IntPtr IntPtr_objc_msgSend_IntPtr (IntPtr receiver, IntPtr selector, IntPtr arg1);

		public static T InstantiateViewController<T> (this UIStoryboard story, string identifier) where T : UIViewController
		{
			var nativeId = NSString.CreateNative (identifier);
			T vc = Runtime.GetNSObject<T> (IntPtr_objc_msgSend_IntPtr (story.Handle, Selector.GetHandle ("instantiateViewControllerWithIdentifier:"), nativeId));
			NSString.ReleaseNative (nativeId);
			return vc;
		}
	}

}