一、建立UITabBarController和UINavigationController（標籤欄控制器和導航控制器）

建立兩個類，FirstViewController和SecondViewController。修改AppDelegate.m中的程式碼。

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    self.window = [[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds
 
];

    //建立tabBarController控制器
    UITabBarController *tabBarController = [[UITabBarController alloc] init];

    //初始化firstView控制器
    FirstViewController *firstView = [[FirstViewController alloc] init];

    //初始化secondView控制器
    SecondViewController *secondView = [[SecondViewController alloc]init];

    //建立導航控制器nav1，顯示firstView
 

    UINavigationController *nav1 = [[UINavigationController alloc] initWithRootViewController:firstView];

    //建立導航控制器nav2，顯示secondView
    UINavigationController *nav2 = [[UINavigationController alloc]initWithRootViewController:secondView];

    //給TabBarController控制器新增子控制器nav1
    [tabBarController addChildViewController:nav1];

    //給TabBarController控制器新增子控制器nav2
 

    [tabBarController addChildViewController:nav2];

    //根控制器設定為TabBarController
    self.window.rootViewController = tabBarController;
    [self.window makeKeyAndVisible];
    return YES;
}

FirstViewController.m中

- (void)viewDidLoad {
    [super viewDidLoad];

    //設定背景顏色為黃色
    self.view.backgroundColor = [UIColor yellowColor];

}

SecondViewController.m中

- (void)viewDidLoad {
    [super viewDidLoad];

    //設定背景顏色為藍色
    self.view.backgroundColor = [UIColor blueColor];
}

執行程式碼，效果圖如下

二、建立UIImageView
我在FirstViewController.m中建立一個UIImageView

- (void)viewDidLoad {
    [super viewDidLoad];

    //設定背景顏色為黃色
    self.view.backgroundColor = [UIColor yellowColor];
    UIImage *image = [UIImage imageNamed:@"Totoro副本"];

    //初始化imageView把image設定為它的圖片
    UIImageView *imageView = [[UIImageView alloc] initWithImage:image];

    //設定imageView的frame
    imageView.frame = CGRectMake(50, 150, 280, 200);

    //把imageView新增到View上
    [self.view addSubview:imageView];
}

執行程式碼，效果如下