Xamarin iOS UIView with borders

UIViewWithBorders.cs

using System;
using UIKit;
using CoreGraphics;

// ported from https://github.com/natrosoft/NAUIViewWithBorders

namespace YourNamespace
{
	/*
	 UIView subview that allows individual borders to be drawn.
	 Null colors for a side will not be drawn.  If borderColorAll
	 is used, it will have priority and each individual color does
	 not need to be assigned.  Be sure to set borderWidths accordingly.
	 Borders are drawn from the view's edge inward.
	 */
	public class UIViewWithBorders : UIView
	{		      
		/* If set, overrides individual widths */
		public nfloat BorderWidthAll { get; set; } 
		/* If set, overrides individual colors */
		public UIColor BorderColorAll { get; set; }

		/* For specifying individual widths */
		public UIEdgeInsets BorderWidth { get; set; }  
		public UIColor BorderColorTop { get; set; }
		public UIColor BorderColorBottom  { get; set; }
		public UIColor BorderColorLeft { get; set; }
	        public UIColor BorderColorRight { get; set; }

		public UIViewWithBorders(CGRect frame) : base(frame)
		{
		}

		public override void Draw (CGRect rect)
		{
			base.Draw (rect);

			if (BorderWidthAll > 0) {
				BorderWidth = new UIEdgeInsets(BorderWidthAll, BorderWidthAll, BorderWidthAll, BorderWidthAll);
			}

			if (BorderColorAll != null) {
				BorderColorTop = BorderColorBottom = BorderColorLeft = BorderColorRight = BorderColorAll;
			}

			var xMin = rect.GetMinX();
			var xMax = rect.GetMaxX ();

			var yMin = rect.GetMinY ();
			var yMax = rect.GetMaxY ();

			var fWidth = this.Frame.Size.Width;
			var fHeight = this.Frame.Size.Height;

			var context = UIGraphics.GetCurrentContext();

			DrawBorders (context, xMin, xMax, yMin, yMax, fWidth, fHeight);
		}

		void DrawBorders(CGContext context, nfloat xMin, nfloat xMax, nfloat yMin, nfloat yMax, nfloat fWidth, nfloat fHeight)
		{
			if (BorderColorTop != null) {
				context.SetFillColor (BorderColorTop.CGColor);
				context.FillRect (new CGRect(xMin, yMin, fWidth, BorderWidth.Top));
			}

			if (BorderColorLeft != null) {
				context.SetFillColor (BorderColorLeft.CGColor);
				context.FillRect (new CGRect (xMin, yMin, BorderWidth.Left, fHeight));
			}

			if (BorderColorRight != null) {
				context.SetFillColor (BorderColorRight.CGColor);
				context.FillRect (new CGRect(xMax - BorderWidth.Right, yMin, BorderWidth.Right, fHeight));
			}

			if (BorderColorBottom != null) {
				context.SetFillColor (BorderColorBottom.CGColor);
				context.FillRect (new CGRect(xMin, yMax - BorderWidth.Bottom, fWidth, BorderWidth.Bottom));
			}
		}
	}
}