APP1 window

        self.window = UIWindow(frame:UIScreen.mainScreen().bounds)

        let rootVC : RootViewController = RootViewController()

        let navi = UINavigationController(rootViewController:rootVC)

        self.window!.rootViewController = navi

        self.window!.makeKeyAndVisible()

APP1 window

原文：http://www.cnblogs.com/tony0571/p/5550912.html