Can any one has practiced creating project in xcode6 (swift) without storyboard.
I am able to implement
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: NSDictionary?) -> Bool {
    // Override point for customization after application launch.
    self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
    self.window!.backgroundColor = UIColor.whiteColor()
    self.window!.makeKeyAndVisible()
    var viewController: ViewController? = ViewController(nibName: "ViewController", bundle: nil)
    self.navigationController = UINavigationController(rootViewController: viewController)
    self.window!.rootViewController = self.navigationController
    return true
}
but it fails with following error
*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 
'-[UIViewController _loadViewFromNibNamed:bundle:] loaded the "ViewController" nib but the 
view outlet was not set.'
so i tried to relate file's owner UIView with xib, but i am unable to see UIView in file's owner property.
See the screen below

EDIT
Thanks Alex but from the second last point from HERE i am unable to find any view. See the screen attached

 
     
    
 
    