UITabBarController 基本用法
一、UITabBarController对象的创建和初始化
首先创建多个视图控制器，并在tabBarItem中添加标题和图片
self.viewController.tabBarItem.title = @"首页";//设置tabBarItem标题
self.viewController.tabBarItem.image = [UIImage imageNamed:@"icon_home"];//添加图片
self.viewController.tabBarItem.badgeValue = @"1";//消息
FirstViewController *one = [[FirstViewController alloc] init];
one.tabBarItem.title = @"消息";
one.tabBarItem.image = [UIImage imageNamed:@"icon_meassage"];
SecondViewController *two = [[SecondViewController alloc] init];
two.tabBarItem.title = @"联系人";
two.tabBarItem.image = [UIImage imageNamed:@"icon_selfinfo"];
ThirdViewController *three = [[ThirdViewController alloc] init];
three.title = @"搜索";
three.tabBarItem.image = [UIImage imageNamed:@"icon_search"];
ForthViewController *four = [[ForthViewController alloc] init];
four.tabBarItem.title = @"更多";
four.tabBarItem.image = [UIImage imageNamed:@"icon_more"];
FifthViewController *five = [[FifthViewController alloc]init];
five.tabBarItem.title = @"订阅";
SixthViewController *six = [[SixthViewController alloc] init];
six.tabBarItem.title = @"下载";
UINavigationController *nav = [[UINavigationController alloc]initWithRootViewController:three];
注意，第三个视图控制器为导航控制器
将多个视图控制器添加到数组（视图超过5个以后，自动生成More，隐藏多出来的视图控制器）
效果为多出来下边一排视图切换工具
NSArray *vcArray = [NSArray arrayWithObjects:self.viewController, one, two, nav, four, five, six, nil];//创建视图控制器数组
UITabBarController *tabBarC = [[UITabBarController alloc] init];
tabBarC.tabBar.selectedImageTintColor = [UIColor redColor];//选中时图片颜色变为红色
tabBarC.viewControllers = vcArray;//将多个视图控制器组织到tab控制器中，以选项卡
self.window.rootViewController = tabBarC;//设置根视图控制器为tabBarController
二、UITabBarController可以实现UITabBarControllerDelegate协议
tabBarC.delegate = self; //设置self为代理
可以重写代理中方法（很少用），表示选中了某个ViewController
-(void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController*)viewController{
//执行相应操作
}
//代码解说
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
FirstViewController *firstController=[[FirstViewController alloc] init];
//设置标题
firstController.title=@"First";
//设置tabBarItem的样式（这种方式是按照系统定义的方式）
firstController.tabBarItem=[[UITabBarItem alloc] initWithTabBarSystemItem:UITabBarSystemItemMoretag:101];
//也可以用自定义方式方式如下：
SecondViewController *secondController=[[SecondViewController alloc] init];
secondController.title=@"Second";
secondController.tabBarItem=[[UITabBarItem alloc] initWithTabBarSystemItem:UITabBarSystemItemHistorytag:102];
ThirdViewController *thirdController=[[ThirdViewController alloc] init];
thirdController.title=@"Third";
thirdController.tabBarItem=[[UITabBarItem alloc] initWithTabBarSystemItem:UITabBarSystemItemFavoritestag:103];
UINavigationController *nav1=[[UINavigationController alloc] initWithRootViewController:firstController];
[firstController release];
UINavigationController *nav2=[[UINavigationController alloc] initWithRootViewController:secondController];
[secondController release];
UINavigationController *nav3=[[UINavigationController alloc] initWithRootViewController:thirdController];
[thirdController release];
NSArray *controllersArray=[[NSArrayalloc] initWithObjects:nav1,nav2,nav3, nil];
[nav1 release];
[nav2 release];
[nav3 release];
UITabBarController *tabController=[[UITabBarController alloc] init];
tabController.viewControllers=controllersArray;
tabController.selectedIndex=0;
tabController.delegate=self;//在AppDelegate.h文件内实现UITabBarControllerDelegate协议
self.tabBarController=tabController;
[tabController release];
[controllersArray release];
[self.window addSubview:tabController.view];
[self.window makeKeyAndVisible];
returnYES;
}
//当点击tabBarItem时触发该操作 UITabBarControllerDelegate中的一个方法
- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController {
NSLog(@"%d", viewController.tabBarItem.tag);
