不使用Main.storyBoard搭Swift项目框架

1.移除Main Interface,如下图:

2.修改Info.plist文件,将下面的代码注释掉.如下图:

3.给AppDelegate添加rootViewController

    var window: UIWindow?

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
        
        self.window = UIWindow.init(frame: UIScreen.main.bounds)
        self.window?.backgroundColor = UIColor.white
        self.window?.makeKeyAndVisible()
        let tabBarVC = MyTabBarController()
        self.window?.rootViewController = tabBarVC
        
        return true
    }