Encapsulation of tabbarcontroller

First, create a class that inherits from UITabBarController
.m Implementation code in ：

    - (void)viewDidLoad {
    [super viewDidLoad];

    ViewController *firstVc = [[ViewController alloc] init];

    [self addChildVc:firstVc title:@" Hello " image:@"mengmeng" selectedImage:@""];
    SecondViewController *secondVc = [[SecondViewController alloc] init];

    [self addChildVc:secondVc title:@"hello" image:@"jiyi" selectedImage:@""];
}

- (void)addChildVc:(UIViewController *)childVC title:(NSString *)title image:(NSString *)image selectedImage:(NSString *)selectedImage
{
    childVC.title = title;// Simultaneous setting tabBar and navgationBar Words of 

    // Set the picture of the controller 
    childVC.tabBarItem.image = [UIImage imageNamed:image];
    childVC.tabBarItem.selectedImage = [UIImage imageNamed:selectedImage];

    // Set the navigation controller 
    UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:childVC];

    // Add as sub controller 
    [self addChildViewController:nav];
}

stay AppDelegate in

self.window.rootViewController = [[QZTabBarController alloc] init];

That's all right.