在Container ViewContorler中顯示多個ViewController的視圖層次結構的正確方法是什麼？

Question

最近，我正在研究一個有多個ViewController的項目，控制器的視圖層次結構需要同時在屏幕上顯示，下面的鏈接（這是一張圖片）就是我的設計。

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

MainViewController是一個容器視圖控制器，我添加了MenuViewController和PictureViewController它是這樣的：

// 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]; 

菜單查看和圖看，現在顯示在屏幕上，問題是隻有圖片View可以響應UI事件（例如Tap Gesture）。看來只有我添加到Container ViewController的最後一個視圖層次可以響應UI事件，爲什麼？以及在Container ViewContorler中顯示多個ViewController的視圖層次結構的正確方法是什麼？

Answer 1

最後，問題被解決了，rdelmar說，我忘了幀設置爲子視圖，蘋果的文件View Controller Programming Guide for iOS（117頁）也提到這一點，代碼應該是：

// 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];