xcode11创建新项目Navigation+tabBar无效

1. info.plist删除 Application Scene Manifest选项

2. 注释掉：

//- (UISceneConfiguration *)application:(UIApplication *)application configurationForConnectingSceneSession:(UISceneSession *)connectingSceneSession options:(UISceneConnectionOptions *)options {//// Called when a new scene session is being created.//// Use this method to select a configuration to create the new scene with.//    return [[UISceneConfiguration alloc] initWithName:@"Default Configuration" sessionRole:connectingSceneSession.role];//}//////- (void)application:(UIApplication *)application didDiscardSceneSessions:(NSSet<UISceneSession *> *)sceneSessions {//// Called when the user discards a scene session.//// If any sessions were discarded while the application was not running, this will be called shortly after application:didFinishLaunchingWithOptions.//// Use this method to release any resources that were specific to the discarded scenes, as they will not return.//}