新浪微博客户端(1)-实现Tabbar导航栏效果

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    
    
    
    // 1. 创建窗口
    self.window = [[UIWindow alloc] init];
    self.window.frame = [UIScreen mainScreen].bounds;
    
    // 2. 设置根控制器
    UITabBarController *tabbarVc = [[UITabBarController alloc] init];
    self.window.rootViewController = tabbarVc;
    
    
    // 3. 设置子控制器属性
    DJHomeViewController *homeVc = [[DJHomeViewController alloc] init];
    [self setChildVc:homeVc withTitle:@"首页" image:@"tabbar_home" selectedImage:@"tabbar_home_selected"];
    
    DJMessageCenterViewController *messageCenterVc = [[DJMessageCenterViewController alloc] init];
    [self setChildVc:messageCenterVc withTitle:@"消息" image:@"tabbar_message_center" selectedImage:@"tabbar_message_center_selected"];
    
    DJDiscoverViewController *discoverVc = [[DJDiscoverViewController alloc] init];
    [self setChildVc:discoverVc withTitle:@"发现" image:@"tabbar_discover" selectedImage:@"tabbar_discover_selected"];
    
    DJProfileViewController *profileVc = [[DJProfileViewController alloc] init];
    [self setChildVc:profileVc withTitle:@"我" image:@"tabbar_profile" selectedImage:@"tabbar_profile_selected"];
    
    // 4. 添加子控制器
    [tabbarVc addChildViewController:homeVc];
    [tabbarVc addChildViewController:messageCenterVc];
    [tabbarVc addChildViewController:discoverVc];
    [tabbarVc addChildViewController:profileVc];
    
    
    // 5. 显示窗口
    [self.window makeKeyAndVisible];
    return YES;
}




- (void)setChildVc:(UIViewController *)vc withTitle:(NSString *)title image:(NSString *)image selectedImage:(NSString *)selectedImage {

    vc.view.backgroundColor = DJRandomColor;
    vc.tabBarItem.title = title;
    
    // 设置tabbarItem 选中图片
    vc.tabBarItem.image = [UIImage imageNamed:image];
    vc.tabBarItem.selectedImage = [[UIImage imageNamed:selectedImage] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
    
    // 设置tabarItem 选中颜色
    NSMutableDictionary *textAttrs = [NSMutableDictionary dictionary];
    textAttrs[NSForegroundColorAttributeName] = DJColor(123, 123, 123);
    
    NSMutableDictionary *selectedTextAttrs = [NSMutableDictionary dictionary];
    selectedTextAttrs[NSForegroundColorAttributeName] = [UIColor orangeColor];
    
    
    [vc.tabBarItem setTitleTextAttributes:textAttrs forState:UIControlStateNormal];
    [vc.tabBarItem setTitleTextAttributes:selectedTextAttrs forState:UIControlStateSelected];

}

最终效果：