        // Override point for customization after application launch.
        self.window = UIWindow.init(frame: UIScreen.main.bounds)//如果不用storyboard就在这里初始化window
        let tabBarCtr = MyTabBarController()
        self.window?.rootViewController = tabBarCtr
        self.window?.backgroundColor = UIColor.white
        self.window?.makeKeyAndVisible()
        return true
    }
