相关疑难解决方法(0)

我创建了一个像下面这样的UITabBarController并推送了一个navigationController,但我现在无法设置标签栏项目的标题等......因为tabbarcontroller是NULL.

请你能告诉我哪里出错了.

UITabBarController *tabBarController = [[UITabBarController alloc] init];
        LoggedInFeedNavigationController *lvc = [[LoggedInFeedNavigationController alloc] initWithAccount:account];
        [tabBarController setViewControllers:[NSArray arrayWithObject:lvc]];
        [tabBarController setSelectedIndex:0];
        [self presentModalViewController:tabBarController animated:YES];
        [tabBarController release];
        [lvc release];