Ios 显示多个ViewController'；容器ViewController中的视图层次？

最近，我在一个有多个ViewController的项目中工作，控制器的视图层次需要同时显示在屏幕上，下面的链接（它是一张图片）是我的设计

MainViewController是一个容器ViewController，我向其中添加了MenuViewController和PictureViewController，如下所示：

// Create the controllers
MainViewContorller* mainVC = [[MainViewController alloc] init];
MenuViewController* menuVC = [[MenuViewController alloc] init];
PictureViewController* pictureVC = [[PictureViewController alloc] init];

// add MenuViewController to MainViewController as its child controller
[mainVC addChildViewController:menuVC];
[mainVC.view addSubview:menuVC.view];
[menuVC didMoveToParentViewController:mainVC];

// add PictureViewController to MainViewController as its child controller
[mainVC addChildViewController:pictureVC];
[mainVC.view addSubview:pictureVC.view];
[pictureVC didMoveToParentViewController:mainVC];

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菜单视图和图片视图现在显示在屏幕上，问题是只有图片视图可以响应UI事件（如点击手势）。似乎只有我添加到容器ViewController的最后一个视图层次结构可以响应UI事件，为什么？在一个容器ViewController中显示多个ViewController的视图层次结构的正确方法是什么？

最后，问题解决了，正如rdelmar所说，我忘记了设置子视图的框架，苹果的文档（第117页）也提到了这一点，代码应该是：

// Create the controllers
MainViewContorller* mainVC = [[MainViewController alloc] init];
MenuViewController* menuVC = [[MenuViewController alloc] init];
PictureViewController* pictureVC = [[PictureViewController alloc] init];

// add MenuViewController to MainViewController as its child controller
[mainVC addChildViewController:menuVC];
[menuVC setFrame:frameOfMenuView];          // set the correct frame to menu view
[mainVC.view addSubview:menuVC.view];       // add menu view as sub view to main view
[menuVC didMoveToParentViewController:mainVC];

// add PictureViewController to MainViewController as its child controller
[mainVC addChildViewController:pictureVC];
[pictureVC setFrame:frameOfPictureView];    // set the correct frame to picture view
[mainVC.view addSubview:pictureVC.view];    // add picture view as sub view to main view
[pictureVC didMoveToParentViewController:mainVC];

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您需要为要添加的子视图设置框架（或添加约束）。视图的无响应可能是由于视图超出了其superview的边界，或大小为零。是否要使用按钮操作更改containerView中的viewController，对吗？