在容器ViewContorler中显示多个ViewController的视图层次结构的正确方法是什么？

Question

最近，我正在一个有多个ViewController的项目中，控制器的视图层次结构需要同时显示在屏幕上，下面的链接（是图片）是我的设计。

http://www.lazycatdesign.com/stuff/question.png

MainViewController是一个容器ViewController，我向其添加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];

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

Answer 1

最终，问题得以解决，正如rdelmar所说，我忘记将框架设置为子视图，苹果的文档《 iOS的View Controller编程指南》 （第117页）也提到了这一点，代码应为：

// 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];