title: webview.URL?.absoluteString returning nil
body: <p>my <code>webview.URL?.absoluteURL.absoluteString</code> is returning nil. This is a <code>WKWebview</code>, not a <code>UIWebVIew</code>, so <code>webview.request?.URL?.absoluteString</code> will not work for this. I have also tried <code>webview.URL?.absoluteString</code>.</p>
  
  <p>The URL is set in another UIViewController class. The webview itself loads properly, so I know .URL is not nil. (use cmd/ctrl+f '//Problem' to find line):</p>
  
  <pre><code>override init(frame: CGRect) {
      super.init(frame: frame)
      gestureRecognizers = [UIPanGestureRecognizer(target:self, action:"moveWindow:")]
      //Change aspects of our view (width, height, color, etc)
      header.frame.size.width=frame.size.width
      header.frame.size.height=45
      header.layer.cornerRadius = 4
      //addSubview(header)
      windowMask.frame=frame
      stackButton.frame=frame
      windowMask.layer.cornerRadius = 6
      windowMask.clipsToBounds=true
  
      layer.shadowColor = UIColor.blackColor().CGColor
      layer.shadowOpacity = 1
      layer.shadowRadius = 5
      layer.shadowOffset = CGSizeMake(0, 1);
      layer.cornerRadius = 6
      backgroundColor = UIColor(patternImage: UIImage(named: "Window Texture.png")!)
      //opaque=false
      //backgroundColor = UIColor.clearColor()
      addSubview(windowMask)
      dragArea.frame.size.width=frame.size.width-120
      dragArea.frame.origin.x=40
      dragArea.frame.origin.x=40
      //addSubview(dragArea)
      //Our webview for... well, isn't it obvious?
      webview.frame = CGRectMake(0, 40, frame.width, frame.height-40)
      webview.allowsBackForwardNavigationGestures=true
      windowMask.frame=CGRectMake(0, 0, frame.width, frame.height)
      windowMask.addSubview(webview)
      //The back button
      bbutton.setImage(UIImage(named: "Back"), forState: .Normal)
      bbutton.frame = CGRectMake(5, 5, 30, 30)
      windowMask.addSubview(bbutton)
      bbutton.addTarget(self, action: "bbuttonPressed:", forControlEvents: .TouchUpInside)
      //The large button to select a window in the Stack menu
      stackButton.addTarget(self, action: "stackSelected:", forControlEvents: .TouchUpInside)
      //The resize button for making the window fullscreen
      rbutton.setImage(UIImage(named: "Max"), forState: .Normal)
      rbutton.frame = CGRectMake(frame.width-60, 7, 25, 25)
      windowMask.addSubview(rbutton)
      rbutton.addTarget(self, action: "rbuttonPressed:", forControlEvents: .TouchUpInside)
      //The X button for closing a window
      xbutton.frame = CGRectMake(frame.width-35, 5, 30, 30)
      xbutton.setImage(UIImage(named: "Close"), forState: .Normal)
      windowMask.addSubview(xbutton)
      xbutton.addTarget(self, action: "xbuttonPressed:", forControlEvents: .TouchUpInside)
      //The button for adjusting window size
      abutton.frame = CGRectMake(frame.width-20, frame.height-20, 20, 20)
      abutton.setImage(UIImage(named: "Resize"), forState: .Normal)
      windowMask.addSubview(abutton)
      abutton.addTarget(self, action: "abuttonDragged:", forControlEvents: .TouchDown)
      //The task button
      taskButton.frame.size=CGSizeMake(60,60)
      taskButton.backgroundColor=UIColor.whiteColor()
      taskButton.frame.origin=CGPointMake(CGFloat(system.windows.count)*60,60)
      taskButton.addTarget(self, action: "taskSelected:", forControlEvents: .TouchDown)
      //Problem here:
      let imgURL = NSURL(string: "http://google.com/s2/favicons?domain="+(self.webview.URL?.absoluteString)!)
      print(self.webview.URL?.absoluteURL.absoluteString)
      let imageRequest: NSURLRequest = NSURLRequest(URL: imgURL!)
      NSURLConnection.sendAsynchronousRequest(
          imageRequest, queue: NSOperationQueue.mainQueue(),
          completionHandler: {(response: NSURLResponse?,data: NSData?,error: NSError?) -&gt; Void in
              if error == nil {
                  self.taskButton.setImage(UIImage(data: data!),forState: .Normal)
              }
      })
      UIView.animateWithDuration(0.2, animations: {
          self.frame.origin.y=50
          self.taskButton.frame.origin.y=0
      })
  }
  </code></pre>
  
  <p>The func in another UIViewController class that sets the URL. Site in web view itself loads properly.</p>
  
  <pre><code>func addWindowButtonPressed(sender: UIButton!) {
      let url = NSURL(string: "https://google.com")
      let request = NSURLRequest(URL: url!)
      let newView = Window(frame: CGRectMake(self.view.frame.size.width/2-200,self.view.frame.size.height, 400, 300))
      if !system.stacked {
          view.addSubview(newView)
          newView.webview.loadRequest(request)
          system.windows.append(newView)
          taskView.addSubview(newView.taskButton)
          newView.windowID=system.windows.count
          taskView.contentSize.width=CGFloat(system.windows.count)*60
      }
      taskView.contentSize.width=CGFloat(system.windows.count)*60
  }
  </code></pre>