Xamarin iOS:如何在屏幕上显示logo时保持视图活动

UIImageView logoImageView = new UIImageView(UIImage.FromBundle("logo.png"));
logoImageView.Frame = new CGRect(x, y, width, height);
this.View.AddSubview(logoImageView);

CABasicAnimation rotationAnimation = CABasicAnimation.FromKeyPath("transform.rotation");
rotationAnimation.Duration = 1.0;
rotationAnimation.RepeatCount = float.PositiveInfinity;
rotationAnimation.From = NSNumber.FromFloat(0);
rotationAnimation.To = NSNumber.FromFloat((float)Math.PI * 2);
logoImageView.Layer.AddAnimation(rotationAnimation, "rotationAnimation");