OC-SB的使用

1.创建storyBoard

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2.关联视图控制器

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- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
   
    //创建Window
    _window = [[UIWindow alloc] initWithFrame: [UIScreen mainScreen].bounds];
    _window.backgroundColor = [UIColor whiteColor];
    [_window makeKeyAndVisible];
    
    //加载Storyboard(Main是文件名)
    UIStoryboard *sb = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
    //(->)入口的控制器
    FirstTabBarController *first = [sb instantiateInitialViewController];
    //根据id关联并创建sb中的FirstTabBarController(指定的)
//    FirstTabBarController *first = [sb instantiateViewControllerWithIdentifier:@"FirstTabBarController"];
    
    //指定根控制器
    _window.rootViewController = first;
    
    return YES;
}

1.添加导航控制器和标签控制器

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2.添加控件

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3.一个标签控制器可以关联四个导航控制器

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