AppDelegate.m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
    self.window.backgroundColor = [UIColor whiteColor];
    [self.window makeKeyAndVisible];
    
    UITabBarController *tabBarController = [[UITabBarController alloc] init];
    FirstViewController *firstViewController = [[FirstViewController alloc] init];
    firstViewController.title = @"首頁";
    UIImage *image = [UIImage imageNamed:@"4-selected@2x.png"];
    image = [image imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
    UIImage *selectImage = [UIImage imageNamed:@"4-nomal@2x.png"];
    selectImage = [selectImage imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
    firstViewController.tabBarItem = [[UITabBarItem alloc] initWithTitle:@"首頁" image:image selectedImage:selectImage];
   UINavigationController *firseNavigaton = [[UINavigationController alloc] initWithRootViewController:firstViewController];
    
    SecondViewController *secondViewController = [[SecondViewController alloc] init];
    secondViewController.title = @"我的";
    
    tabBarController.viewControllers = @[firseNavigaton,secondViewController];
    self.window.rootViewController = tabBarController;
     //tabBar屬性
    tabBarController.tabBar.tintColor = [UIColor blackColor];
    //tabBarController.tabBar.barTintColor = [UIColor greenColor];
    //不透明
    tabBarController.tabBar.translucent = NO;

    return YES;
}

UITabBarController 就是像微信下面的（我的、發現、通訊錄、首頁）這類的東西，基本上的App都有這個，大家要熟練應用哦