iOS Create Gradient Background

CreateGradientBackground.cs

UIImage CreateGradientBackground(Color startColor, Color endColor, CustomNavigationPage.GradientDirection direction)
{
            var gradientLayer = new CAGradientLayer();
            gradientLayer.Bounds = NavigationController.NavigationBar.Bounds;
            gradientLayer.Colors = new CGColor[] { startColor.ToCGColor(), endColor.ToCGColor() };

            switch(direction)
            {
                case CustomNavigationPage.GradientDirection.LeftToRight:
                    gradientLayer.StartPoint = new CGPoint(0.0, 0.5);
                    gradientLayer.EndPoint = new CGPoint(1.0, 0.5);
                    break;
                case CustomNavigationPage.GradientDirection.RightToLeft:
                    gradientLayer.StartPoint = new CGPoint(1.0, 0.5);
                    gradientLayer.EndPoint = new CGPoint(0.0, 0.5);
                    break;
                case CustomNavigationPage.GradientDirection.BottomToTop:
                    gradientLayer.StartPoint = new CGPoint(1.0, 1.0);
                    gradientLayer.EndPoint = new CGPoint(0.0, 0.0);
                    break;
                default:
                    gradientLayer.StartPoint = new CGPoint(1.0, 0.0);
                    gradientLayer.EndPoint = new CGPoint(0.0, 1.0);
                    break;
            }

            UIGraphics.BeginImageContext(gradientLayer.Bounds.Size);
            gradientLayer.RenderInContext(UIGraphics.GetCurrentContext());
            UIImage image = UIGraphics.GetImageFromCurrentImageContext();
            UIGraphics.EndImageContext();


            return image;
}