title: Changing visibility if UIView in ViewControllerTwo from ViewControllerOne
body: <p>I am using XLPagerStrip to show two tabs. I have a search bar to search on each ViewController.  I have I filter button that should be clicked from ViewcontrollerOne to change the visibility of a UIView in ViewControllerTwo. Here is what I have implemented but I'm getting
  Fatal error: Unexpectedly found nil while implicitly unwrapping an Optional on the view</p>
  <p>ViewcontrollerOne</p>
  <pre><code>viewControllerTwo.getFilterStatus(status: isFilter)
  </code></pre>
  <p>ViewControllerTwo</p>
  <pre><code>func getFilterStatus(status: Bool){
      if (status) {
          viewFilter.isHidden = false
      } else {
          viewFilter.isHidden = true
      }
  }
  </code></pre>