ios--UITabBarController的基本用法3

课堂实例3：

集成Tab Bar Controller和Navigation Controller

实例代码：

  <pre name="code" class="objc">   [self.window makeKeyAndVisible];        /*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];    UINavigationController *homeNav = [[UINavigationController alloc]initWithRootViewController:vc1];    UITabBarItem *homeItem = [[UITabBarItem alloc]initWithTabBarSystemItem:UITabBarSystemItemFavorites tag:1];    vc1.tabBarItem = homeItem;    vc1.title = @"首页";    vc1.view.backgroundColor = [UIColor redColor];    //消息页    MesageViewController *vc2 = [[MesageViewController alloc]init];     UINavigationController *mesNav = [[UINavigationController alloc]initWithRootViewController:vc2];    UITabBarItem *mesItem = [[UITabBarItem alloc]initWithTitle:@"搜索" image:[UIImage imageNamed:@"alarm"] tag:4];    vc2.tabBarItem = mesItem;    vc2.title = @"消息";    vc2.view.backgroundColor = [UIColor blueColor];    //搜索页    SearchViewController *vc3 = [[SearchViewController alloc]init];     UINavigationController *sacNav = [[UINavigationController alloc]initWithRootViewController:vc3];   UITabBarItem *sacItem = [[UITabBarItem alloc]initWithTitle:@"搜索" image:[UIImage imageNamed:@"alarm"] tag:3];    vc3.tabBarItem = sacItem;    vc3.title = @"搜索";    vc3.view.backgroundColor = [UIColor grayColor];    //设置页    settingViewController *vc4 = [[settingViewController alloc]init];     UINavigationController *setNav = [[UINavigationController alloc]initWithRootViewController:vc4];    UITabBarItem *setItem = [[UITabBarItem alloc]initWithTitle:@"搜索" image:[UIImage imageNamed:@"alarm"] tag:4];    vc4.tabBarItem = setItem;    //其它页    OtherViewController *vc5 = [[OtherViewController alloc]init];    UINavigationController *othNav = [[UINavigationController alloc]initWithRootViewController:vc5];    UITabBarItem *othItem = [[UITabBarItem alloc]initWithTitle:@"搜索" image:[UIImage imageNamed:@"alarm"] tag:5];    vc5.tabBarItem = othItem;        vc5.title = @"其它";    vc5.view.backgroundColor = [UIColor lightGrayColor];            NSArray *viewControllers = @[homeNav,mesNav,sacNav,setNav,othNav];//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}