设置导航控制器

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    
    self.window = [[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];
    
    UIStoryboard *storyBoard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
    
    ViewController *vc = [storyBoard instantiateViewControllerWithIdentifier:@"view"];
    
    self.window.rootViewController = [[UINavigationController alloc]initWithRootViewController:vc];
    
    [self.window makeKeyAndVisible];
    
      
    return YES;
}

[self.navigationController pushViewController:liveVC animated:YES];

[self presentViewController:liveVC animated:YES completion:nil];