title: Force child classes to implement protocol swift
body: <p>How can i forced a child class to implement a protocol declared in the parent class?</p>
  
  <p>I tried this:</p>
  
  <pre><code>protocol MyProtocol {
      var myVar : String { get }
  }
  
  class ParentClass: MyProtocol {
      var myVar = "parent"
  }
  
  class ChildClass: ParentClass {
  }
  </code></pre>
  
  <p>But my child class doesn't force me to override myVar.</p>
  
  <p>This is possible ?</p>
  
  <p>Thank you very much,</p>
  
  <p>Morgan</p>