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The UIViewController docs mentions about -viewWillDisappear:

"This method is called in response to a view being removed from its window or covered by another view. This method is called before the view is actually removed or covered and before any animations are configured."

In iOS 4.3 and lower we are supposed to present a viewController and not add a viewController's view to the view hierarchy explicitly, so the calls -viewWillDisappear or -viewDidDisappear would be triggered when a new view controller is being presented over the existing view, in which case 'covered by another view' is true! But what if a viewController's view is hidden since another view obstructs the viewController's view? Do we get these callbacks?

Well, in iOS 5 there is a UIViewController containment concept where views can be directly added as subviews in view hierarchy by setting the parent-child relationship between viewControllers. So, unlike <= 4.3 OS, -viewWillDisappear and -viewDidDisappear calls should ideally be triggered when a viewController's view is obstructed or covered by some other view, which I have verified by a sample project that it is not happening in SDK 5.0.

Has anyone found this problem related to these callbacks? Or, is my understanding correct?

Thanks, Raj

logancautrell
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Raj Pawan Gumdal
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1 Answers1

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Someone has the same kind of problem here :

iOS 5 : -viewWillAppear is not called after dismissing the modal in iPad

You should read the answers, I found them very interesting.

Community
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Oliver
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