title: Loading from a nib UIView unused Swift 3
body: <p>since migrating to Swift 3 for the following code:</p>
  
  <pre><code>func setup() {
  
          Bundle.main.loadNibNamed("SomeNib", owner: self, options: nil)?[0] as! UIView
          self.addSubview(customView)
          customView.frame = self.bounds
  
  
      }
  </code></pre>
  
  <p>I am now getting the warning: <code>Expression of type 'UIView' is unused</code>. What am I doing wrong here?</p>