UI基础 - UITabBarController

　　 self.window = [[UIWindow alloc] init];
    self.window.frame = [UIScreen mainScreen].bounds;
    oneViewController *oneview = [[oneViewController alloc] init];
    //设置tabbarItem的图片并且设置渲染模式为UIImageRenderingModeAlwaysOriginal（不渲染，使用原始图片） 默认渲染
    oneview.tabBarItem.image = [[UIImage imageNamed:@"tabbar_discover_selected"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
    //设置选中控制器的tabbarItem的图片并且设置渲染模式为UIImageRenderingModeAlwaysOriginal（不渲染，使用原始图片） 默认渲染
    oneview.tabBarItem.selectedImage = [[UIImage imageNamed:@"tabbar_discover_os7"]imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];

    twoViewController *twoview = [[twoViewController alloc] init];
    twoview.tabBarItem.image = [[UIImage imageNamed:@"tabbar_home"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
    twoview.tabBarItem.selectedImage = [[UIImage imageNamed:@"tabbar_home_selected_os7"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];

    XJTabBarController *tabC = [[XJTabBarController alloc] init];
    //添加子控制器方式一
//    [tabC addChildViewController:oneview];
    //添加子控制器方式二
    tabC.viewControllers = @[oneview,twoview];

    self.window.rootViewController = tabC;