Iphone xcode选项卡栏可自定义

我想知道是否有关于这个选项卡栏自定义的教程或任何提示，当您选择一个选项卡栏并按住时，您可以将图标更改为用户喜欢的类型（检查底部）。

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[选项卡]

使用手势

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

{

    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

    UITabBarController *tabController = [[UITabBarController alloc] init];  


    UIViewController *viewController1 = [[UIViewController alloc] init]; 
   // UIlongtapGusture alloc and add it to  viewController1


    UIViewController *viewController2 = [[UIViewController alloc] init];  
    // UIlongtapGusture alloc and add it to  viewController2

    UIViewController *viewController3 = [[UIViewController alloc] init];    
   // UIlongtapGusture alloc and add it to  viewController3

    UIViewController *viewController4 = [[UIViewController alloc] init];  
     // UIlongtapGusture alloc and add it to  viewController4


    tabController.viewControllers = [NSArray arrayWithObjects:viewController1, 

                                     viewController2, 

                                     viewController3, 

                                     viewController4, nil];

    self.window.rootViewController = tabController;  


    [self.window makeKeyAndVisible];

    return YES;

}

见