为什么不在UIViewController子类中分配UIWindow对象呢？
假设应用程序仅使用单一用途的视图控制器。将所需的 UIWindow 对象分配为视图控制器子类的成员是否有本质上的坏处？
编程指南没有提供任何以这种方式构建的示例，尽管它们似乎也没有强调这是否真正允许。
Suppose the application will only use a single-purpose view controller. Is there anything inherently bad with allocating the required UIWindow object as a member of the view controller subclass?
The programming guide does not provide any examples built this way, although they also don't seem to emphasize whether that's truly allowed or not.
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我问了同样的问题并找到了你的问题。环顾四周后，我发现回归基础是正确的做法，所以
http://developer.apple.com/library/ios/#documentation/WindowsViews/Conceptual/ViewPG_iPhoneOS/Introduction/Introduction.html
I was asking the same question and found yours. After a look around, I found that going back to basics was the correct thing to do, so
http://developer.apple.com/library/ios/#documentation/WindowsViews/Conceptual/ViewPG_iPhoneOS/Introduction/Introduction.html