title: Value of type uiview has no member size
body: <p>I have error:
  Value of type uiview has no member size. Here is my code:</p>
  
  <pre><code>if let nv = (AppDelegate.getAppDelegate().window?.rootViewController as? UINavigationController) {
  
          let pushedViewControllers = nv.viewControllers
          let presentedViewController:UIViewController = pushedViewControllers[pushedViewControllers.count - 1]
          UIGraphicsBeginImageContext(presentedViewController.view.size()) //HERE IS THE ERROR
  </code></pre>
  
  <p>Checked the h file, UIViewController has public var view: UIView!
  Thanks!</p>