1.创建好工程后删除工程中main.storyboard文件
2.修改工程配置文件去掉main
3.修改info.plist文件，删除这一行
4.
- (void)scene:(UIScene *)scene willConnectToSession:(UISceneSession *)session options:(UISceneConnectionOptions *)connectionOptions {
UIWindowScene *windowScene = (UIWindowScene *)scene;
self.window = [[UIWindow alloc] initWithWindowScene:windowScene];
self.window.frame = windowScene.coordinateSpace.bounds;
self.window.backgroundColor = [UIColor whiteColor];
ViewController *vc = [[ViewController alloc]init];
self.window.rootViewController = [[UINavigationController alloc]initWithRootViewController:vc];
[self.window makeKeyAndVisible];
}
