AnimationNavigationControllerDelegate.cs

public class AnimationNavigationControllerDelegate : UINavigationControllerDelegate
{
  private TransitionAnimator _animator = new TransitionAnimator();

  public override IUIViewControllerAnimatedTransitioning GetAnimationControllerForOperation(UINavigationController navigationController, UINavigationControllerOperation operation, UIViewController fromViewController, UIViewController toViewController)
  {
    return _animator;
  }
}