title: Realm forces to add @objc word while defining dynamic variables
body: <p>I am currently playing around with RealmSwift and in the tutorial of Marin Todorov, he created variables like this and compiler doesn't complain.<a href="https://i.stack.imgur.com/6yIFC.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/6yIFC.png" alt="realm tutorial image"></a></p>
  
  <p>But whenever I try to create those variables by myself, compiler wants me to add <code>@objc</code> word<a href="https://i.stack.imgur.com/U0thJ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/U0thJ.png" alt="compiler error"></a></p>
  
  <p>Are those different things or do they behave differently?</p>