ios--UITabBarController代理的使用

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一、设置分栏控制器代理

1、设置UITabBarController代理

通过实现tabBarController的代理方法，可以监听视图控制器的切换

实践代码：

     /*思路：     *1.创建若干个子视图控制器（它们是并列的关系）     * 1.1创建UITabBarItem实例，赋值给相应的子视图控制器（2中方法）     *2.创建一个数组，将已创建的子视图控制器，添加到数组中     *3.创建UITabBarController实例     *4.tabBarController.viewControllers = viewControllers;     *5.添加到window的rootViewController中(显示出来)     */        homeViewController *vc1 = [[homeViewController  alloc]init];    UITabBarItem *homeItem = [[UITabBarItem alloc]initWithTabBarSystemItem:UITabBarSystemItemFavorites tag:1];    vc1.tabBarItem = homeItem;    //vc1.title = @"首页";    //vc1.view.backgroundColor = [UIColor redColor];        MesageViewController *vc2 = [[MesageViewController alloc]init];    UITabBarItem *msmItem = [[UITabBarItem alloc]initWithTabBarSystemItem:UITabBarSystemItemContacts tag:2];    vc2.tabBarItem = msmItem;    //vc2.title = @"新闻";   // vc2.view.backgroundColor = [UIColor blueColor];        SearchViewController *vc3 = [[SearchViewController alloc]init];    UITabBarItem *sacItem = [[UITabBarItem alloc]initWithTabBarSystemItem:UITabBarSystemItemHistory tag:3];    vc3.tabBarItem = sacItem;    //vc3.title = @"历史";    //vc3.view.backgroundColor = [UIColor grayColor];        settingViewController *vc4 = [[settingViewController alloc]init];    UITabBarItem *setItem = [[UITabBarItem alloc]initWithTabBarSystemItem:UITabBarSystemItemMore tag:4];    vc4.tabBarItem = setItem;    //vc4.title = @"搜索";    //vc4.view.backgroundColor = [UIColor yellowColor];                NSArray *viewControllers = @[vc1,vc2,vc3,vc4];//把他们放在数组中    UITabBarController *tabBarController = [[UITabBarController alloc]init];     //初始化    tabBarController.delegate = self;     //设置代理    [tabBarController setViewControllers:viewControllers animated:YES];    self.window.rootViewController = tabBarController;        return YES;    //标志位（flag）}#pragma mark - TabBarController Delegate- (BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController{    NSLog(@"shouldSelectViewController");    return YES;} //视图将要切换是调用，viewController为将要显示的控制器- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController{    NSLog(@"didSelectViewController");    //视图已经切换后调用，viewController 是已经显示的控制器}

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