主要是UITabBarController和UINavigationController的组合实现功能：
appdelegate中代码如下：

@implementation AppDelegate


- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
//    ViewController *root = [[ViewController alloc]init];
//    UINavigationController * nav = [[UINavigationController alloc] initWithRootViewController:root];
//    self.window.rootViewController = nav;
    
    
    TABViewController *tabBarController=[[TABViewController alloc]init];
    
    MainViewController *main=[[MainViewController alloc]init];
    MeViewController *me=[[MeViewController alloc]init];
    //创建导航控制器nav1，显示firstView
    UINavigationController *nav1 = [[UINavigationController alloc] initWithRootViewController:main];
    nav1.tabBarItem.title=@"react";
    nav1.tabBarItem.image = [UIImage imageNamed:@"0.png"];
    nav1.tabBarItem.selectedImage = [UIImage imageNamed:@"0.png"];

    
    //创建导航控制器nav2，显示secondView
    UINavigationController *nav2 = [[UINavigationController alloc]initWithRootViewController:me];
    nav2.tabBarItem.title=@"demo";
    nav2.tabBarItem.image = [UIImage imageNamed:@"0.png"];
    nav2.tabBarItem.selectedImage = [UIImage imageNamed:@"0.png"];
    
    //给TabBarController控制器添加子控制器nav1
    [tabBarController addChildViewController:nav1];
    
    //给TabBarController控制器添加子控制器nav2
    [tabBarController addChildViewController:nav2];
    
    
//    tabBarController.viewControllers=@[webChatController,contactController];
    //注意默认情况下UITabBarController在加载子视图时是懒加载的，所以这里调用一次contactController，否则在第一次展示时只有第一个控制器tab图标，contactController的tab图标不会显示
    for (UIViewController *controller in tabBarController.viewControllers) {
        UIViewController *view= controller.view;
    }
    
    _window.rootViewController=tabBarController;
    [_window makeKeyAndVisible];
    
    return YES;
}

MainViewController和MeViewController自行实现，MeViewController中我添加了一个navbarButton按钮进行页面跳转,代码如下：

MeViewController
  [super viewDidLoad];
    [self.view setBackgroundColor:[UIColor whiteColor]];
//    [self initNav];
    self.navigationItem.title = @"小美的朋友圈";
    UIBarButtonItem *btn = [[UIBarButtonItem alloc] initWithTitle:@"跳转" style:UIBarButtonItemStyleDone target:self action:@selector(goto)];
    self.navigationItem.leftBarButtonItem = btn;


-(void)goto{
    DemoViewController *demo = [[DemoViewController alloc] init];
    [self.navigationController pushViewController:demo animated:YES];
}

效果如下图：

image.png

image.png

跳转之后的界面：

goto

跳转之后的界面要手动隐藏地步的tablebar；

-(instancetype)init{
    // 使底部的TabBar隐藏
    self = [super init];
    if(self){
        self.hidesBottomBarWhenPushed = YES;
    }
    return self;
}