TabbarController的封装

首先建立一个类继承自UITabBarController
.m中实现代码：

    - (void)viewDidLoad {
    [super viewDidLoad];

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

    [self addChildVc:firstVc title:@"你好" 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;//同时设置tabBar和navgationBar的文字

    //设置控制器的图片
    childVC.tabBarItem.image = [UIImage imageNamed:image];
    childVC.tabBarItem.selectedImage = [UIImage imageNamed:selectedImage];

    //设置导航控制器
    UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:childVC];

    //添加为子控制器
    [self addChildViewController:nav];
}

在AppDelegate中

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

就可以了