NSNotificationCenter的简单应用

使用UITabBarController创建Tab Bar应用

最新推荐文章于 2023-03-28 21:22:51 发布

原创最新推荐文章于 2023-03-28 21:22:51 发布 · 1.6k 阅读

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文章标签：

#application #button #object #image

本文指导如何在AppDelegate中引入并配置UITabBarController，实现Tab Bar样式的应用界面，并展示了如何在不同ViewController中添加Tab Bar图标和实现通知机制。

在AppDelegate中添加UITabBarController

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

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

   tabBarController = [[UITabBarController alloc] init];

   ChinaViewController* vc1 = [[ChinaViewController alloc] init];

   HubeiViewController* vc2 = [[HubeiViewController alloc] init];

   NSArray* controllers = [NSArray arrayWithObjects:vc1, vc2, nil];

   tabBarController.viewControllers = controllers;

   [self.window addSubview:tabBarController.view];

   [self.window makeKeyAndVisible];

   return YES;

}

ChinaViewController类中添加方法

-(id)init {
   if ([super init] != nil) {
       UITabBarItem *item = [[UITabBarItem alloc] initWithTitle:@"China" image:nil tag:1];
       self.tabBarItem = item;
       [item release];
   }
   return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
   [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(test:)
                                               name:@"wangsong" object:nil];
}

- (void)test:(NSNotification*)notify{

   NSString *testString = @"Test Notification!";

   UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Notification"
                                                       message:testString
                                                       delegate:nil
                                              cancelButtonTitle:@"OK"
                                              otherButtonTitles:nil];
   [alertView show];

   [alertView release];

}

在HubeiViewController类中添加方法：

-(id)init {
   if ([super init] != nil) {
       UITabBarItem *item = [[UITabBarItem alloc] initWithTitle:@"Hubei" image:nil tag:1];
       self.tabBarItem = item;
       [item release];
   }
   return self;
}
添加一个button的响应方法：

- (IBAction)btPressed{

   [[NSNotificationCenter defaultCenter] postNotificationName:@"wangsong" object:nil];

}

点击这个button的时候，将会调用ChinaViewController中的(void)test:(NSNotification*)notify方法，弹出alertShow。