IOS UITabBarController(控制器)的子控制器

UITabBarController的簡單使用 

● UITabBarController的使用步驟
➢ 初始化UITabBarController
➢ 設置UIWindow的rootViewController為UITabBarController
➢ 根據具體情況,通過addChildViewController方法添加對應個數的子控制器 

 

UITabBarController的子控制器 

● UITabBarController添加控制器的方式有2種

➢ 添加單個子控制器

- (void)addChildViewController:(UIViewController *)childController;

➢ 設置子控制器數組
@property(nonatomic,copy) NSArray *viewControllers; 

 

 

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // 1.創建window
    self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
    self.window.backgroundColor = [UIColor whiteColor];
    
    // 設置window的根控制器
    // 1.創建tabbarcontroller
    UITabBarController *tbVc = [[UITabBarController alloc] init]; // 2.設置UITabBarController為winow的根控制器
    self.window.rootViewController = tbVc; // 3.創建並添加子控制器
    UIViewController *vc1 = [[UIViewController alloc] init];
    vc1.tabBarItem.title = @"消息";
    vc1.tabBarItem.image = [UIImage imageNamed:@"tab_recent_nor"];
    vc1.tabBarItem.badgeValue = @"998";
//    vc1.tabBarItem.selectedImage
    vc1.view.backgroundColor = [UIColor redColor];
    
    UIViewController *vc2 = [[UIViewController alloc] init];
    vc2.tabBarItem.title = @"聯系人";
    vc2.tabBarItem.image = [UIImage imageNamed:@"tab_buddy_nor"];
    vc2.view.backgroundColor = [UIColor greenColor];
    
    UIViewController *vc3 = [[UIViewController alloc] init];
    vc3.view.backgroundColor = [UIColor purpleColor];
    
   [tbVc addChildViewController:vc1];
    [tbVc addChildViewController:vc2];
    [tbVc addChildViewController:vc3];
    
//    tbVc.viewControllers = @[vc1, vc2, vc3];
    
    // 讓window顯示出來
 [self.window makeKeyAndVisible]; return YES;
}

 

UITabBarButton 

● UITabBarButton里面顯示什么內容,由對應子控制器的tabBarItem屬性決定

● UITabBarItem有以下屬性影響着UITabBarButton的內容

➢ 標題文字
@property(nonatomic,copy) NSString *title;

➢ 圖標
@property(nonatomic,retain) UIImage *image;

➢ 選中時的圖標
@property(nonatomic,retain) UIImage *selectedImage;

➢ 提醒數字

@property(nonatomic,copy) NSString *badgeValue;