gistfile1.swift

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
        var nav: UIViewController = NavViewController()
        let navigationController = UINavigationController(rootViewController: nav)
        
        self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
        
        self.window!.rootViewController = navigationController
        
        self.window!.backgroundColor = UIColor.whiteColor()
        self.window!.makeKeyAndVisible()
        return true
    }