[Xamarin] Add Yoga/YogaKit identical to native objc version

csharp/Xamarin.iOS/Facebook.YogaKit.iOS.Sample/ViewController.cs

@@ -0,0 +1,60 @@
+using System;
+using CoreGraphics;
+using Facebook.Yoga;
+using UIKit;
+
+namespace Facebook.YogaKit.iOS.Sample
+{
+	public partial class ViewController : UIViewController
+	{
+		protected ViewController(IntPtr handle) : base(handle)
+		{
+			// Note: this .ctor should not contain any initialization logic.
+		}
+
+		public override void ViewDidLoad()
+		{
+			base.ViewDidLoad();
+			CreateViewHierarchy(View, View.Bounds.Size.Width, View.Bounds.Size.Height);
+		}
+
+		static void CreateViewHierarchy(UIView root, nfloat width, nfloat height)
+		{
+			root.BackgroundColor = UIColor.Red;
+
+			root.UsesYoga(true);
+			root.YogaWidth(width);
+			root.YogaWidth(height);
+			root.YogaAlignItems(YogaAlign.Center);
+			root.YogaJustify(YogaJustify.Center);
+
+			var child1 = new UIView { BackgroundColor = UIColor.Blue };
+			child1.YogaWidth(100);
+			child1.YogaHeight(100);
+			child1.UsesYoga(true);
+
+			var child2 = new UIView
+			{
+				BackgroundColor = UIColor.Green,
+				Frame = new CGRect { Size = new CGSize(200, 100) }
+			};
+
+			var child3 = new UIView
+			{
+				BackgroundColor = UIColor.Yellow,
+				Frame = new CGRect { Size = new CGSize(100, 100) }
+			};
+
+			child2.AddSubview(child3);
+			root.AddSubview(child1);
+			root.AddSubview(child2);
+			root.YogaApplyLayout();
+		}
+
+		public override void DidReceiveMemoryWarning()
+		{
+			base.DidReceiveMemoryWarning();
+			// Release any cached data, images, etc that aren't in use.
+		}
+	}
+}