• 代码实现
  #import "ZYTabBarViewController.h"

   #import "ZYEssenceViewController.h"
   #import "ZYFriendTrendsViewController.h"
   #import "ZYMeViewController.h"
   #import "ZYNewViewController.h"
   #import "ZYPublishViewController.h"
   #import "UIImage+Image.h"

   @interface ZYTabBarViewController()
   @end
   @implementation ZYTabBarViewController

   /**利用富文本设置tabbar的标题颜色和尺寸*/
   + (void)load
  {
   //  获取哪个类中UITabBarItem
     UITabBarItem *item = [UITabBarItem appearanceWhenContainedIn:self, nil];

    //  设置按钮选中标题的颜色
     NSMutableDictionary *attrs = [NSMutableDictionary dictionary];
     attrs[NSForegroundColorAttributeName] = [UIColor blackColor];
     [item setTitleTextAttributes:attrs forState:UIControlStateNormal];

     //   设置字体尺寸--只能设置正常状态下
     NSMutableDictionary *attrsNor = [[NSMutableDictionary alloc]init];
     attrsNor[NSFontAttributeName] = [UIFont systemFontOfSize:13];
     [item setTitleTextAttributes:attrsNor forState:UIControlStateNormal];

    }

     /**封装添加子控制器*/
   - (void)setUpOneChildViewController:(UIViewController *)vc image:(NSString *)image selectedImage:(NSString *)selectedImage title:(NSString *)title isHasNav:(BOOL)isHasNav
    {
       vc.tabBarItem.image = [UIImage imageNamed:image];
       vc.tabBarItem.selectedImage = [UIImage imageOriginalWith:selectedImage];

       if (isHasNav == YES) {
    vc.title = title;
    UINavigationController *nav = [[UINavigationController alloc]initWithRootViewController:vc];
    [self addChildViewController:nav];
   }else{

     [self addChildViewController:vc];
    }

    }

   #pragma mark- 添加所有子控制器
  - (void)setupAllChildViewController
  {  //  精华
     ZYEssenceViewController *easence = [[ZYEssenceViewController alloc]init];
     [self setUpOneChildViewController:easence image:@"tabBar_essence_icon" selectedImage:@"tabBar_essence_click_icon" title:@"精华" isHasNav:YES];

     //  新帖
     ZYNewViewController *new = [[ZYNewViewController alloc]init];
     [self setUpOneChildViewController:new image:@"tabBar_friendTrends_icon" selectedImage:@"tabBar_new_click_icon" title:@"新帖" isHasNav:YES];

     //  发布
     ZYPublishViewController *publish = [[ZYPublishViewController alloc]init];
     [self setUpOneChildViewController:publish image:@"tabBar_publish_icon" selectedImage:@"tabBar_publish_click_icon" title:nil isHasNav:NO];

     //  关注
     ZYFriendTrendsViewController *friendTrends = [[ZYFriendTrendsViewController alloc]init];
     [self setUpOneChildViewController:friendTrends image:@"tabBar_friendTrends_icon" selectedImage:@"tabBar_friendTrends_click_icon" title:@"关注" isHasNav:YES];

     //   我的
     ZYMeViewController *me = [[ZYMeViewController alloc]init];
     [self setUpOneChildViewController:me image:@"tabBar_me_icon" selectedImage:@"tabBar_me_click_icon" title:@"我的" isHasNav:YES];

  }
    #pragma mark - 生命周期
  - (void)viewDidLoad
   {  [super viewDidLoad];

   //  设置子控制器并添加按钮的内容
   [self setupAllChildViewController];

  }