Creating the CustomMapOverlay class using C#

In this section, we will take a look at how to create the CustomMapOverlay class that will inherit from our Xamarin.Forms.Maps namespace and implement the underlying properties and instance methods. These will be used to create a native map overlay using a CustomRenderer class for both our iOS and Android platforms.

Let's start by creating the CustomMapOverlay class by performing the following steps:

1. First, create a new Empty Class called CustomMapOverlay within the Views folder, as you did in the section entitled Creating and implementing the LocationService class, located within this chapter.
2. Next, ensure that the CustomMapOverlay.cs file is displayed within the code editor and enter the following code snippet:

      //
      //  CustomMapOverlay.cs
      //  Displays a custom map overlay using the stored Route Coordinates
      //
      //  Created by Steven F. Daniel on 28/06/2018
      //  Copyright © 2018 GENIESOFT STUDIOS. All rights reserved...