UIViewController的误用

如果在一个UIViewController中有如下代码，你可能就在误用UIViewController

 viewController.view.bounds = CGRectMake(50, 50, 100, 200);
 [viewController.view addSubview:someOtherViewController.view];
 

官方添加subView的方式

Listing 14-1 Adding another view controller’s view to the container’s view hierarchy

 -(void) displayContentController: (UIViewController*) content;
 {
 [self addChildViewController:content]; // 1
 content.view.frame = [self frameForContentController]; // 2
 [self.view addSubview:self.currentClientView];
 [content didMoveToParentViewController:self]; // 3
 }
 

Listing 14-2 Removing another view controller’s view to the container’s view hierarchy

 -(void) hideContentController: (UIViewController*) content
 {
 [content willMoveToParentViewController:nil]; // 1
 [content.view removeFromSuperview]; // 2
 [content removeFromParentViewController]; // 3
 }
 

参考连接：

UIViewController的误用
0)Abusing UIViewController

1. view controller programming guide for ios

2)view controller basics