在SceneDelegate中：
- (void)scene:(UIScene*)scenewillConnectToSession:(UISceneSession*)sessionoptions:(UISceneConnectionOptions*)connectionOptions {
? ? UIWindowScene*windowScene = (UIWindowScene*)scene;
? ? ? self.window = [[UIWindow alloc] initWithWindowScene:windowScene];
? ? ? self.window.frame = windowScene.coordinateSpace.bounds;
? ? ? self.window.rootViewController = [ViewController new];
? ? ? [self.window makeKeyAndVisible];
? ? // Use this method to optionally configure and attach the UIWindow `window` to the provided UIWindowScene `scene`.
? ? // If using a storyboard, the `window` property will automatically be initialized and attached to the scene.
? ? // This delegate does not imply the connecting scene or session are new (see `application:configurationForConnectingSceneSession` instead).
}
