title: Subscribe to a variable of a custom UIView
body: <p>I have a custom View, and in this custom View I declared <code>var isSelected: false</code> that is gonna be toggle when taping on the view.</p>
  
  <p>After I add two of those custom Views in my ViewController.</p>
  
  <p><strong>What I need is</strong>: When I select one of view, the other one is immediately deselected, so only one can be selected at the same time.</p>
  
  <p>I don't have much knowledge about it, but I assume that with RxCocoa (or ideally RxSwift) it might be possible to set this <code>isSelected</code> variable of each view as an observable, and then in the subscription, set the other one to false once it turns true.</p>
  
  <p>Help will be much appreciated, thank you in advance.</p>