APP1 window

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        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

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