UITabBarController

UITabBarController *tabBar = [[UITabBarControlleralloc]initWithNibName:nilbundle:nil];
    
    UIViewController *addView = [[AddClassViewControlleralloc]initWithNibName:@"AddClassViewController"bundle:nil];
    UINavigationController *addNav = [[UINavigationControlleralloc]initWithRootViewController:addView];
    addNav.tabBarItem.title =@"添加班级";
//    addNav.tabBarItem.image
    
    UIViewController *checkView = [[CheckClassViewControlleralloc]initWithNibName:@"CheckClassViewController"bundle:nil];
    UINavigationController *checkNav = [[UINavigationControlleralloc]initWithRootViewController:checkView];
    checkNav.tabBarItem.title =@"查看班级";
    
    UIViewController *otherView = [[ViewControlleralloc]initWithNibName:@"ViewController_iPhone"bundle:nil];
    UINavigationController *otherNav = [[UINavigationControlleralloc]initWithRootViewController:otherView];
    otherNav.tabBarItem.title =@"天气预报";
    
    tabBar.viewControllers = [NSArrayarrayWithObjects:checkNav,addNav,otherNav, nil];