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    <p>There's a lack of details here. How are you "exchanging" the two views?</p> <p>If you were using a UINavigationController as the container then viewWillAppear/viewDidAppear would be called whenever you push/pop a new viewController. These calls are made by the UINavigationController itself. If you ARE using a UINavigationController then make sure you have the prototypes correct for these functions.</p> <pre><code>- (void)viewWillAppear:(BOOL)animated </code></pre> <p>If you are trying to implement a view hierarchy yourself then you may need to make these calls yourself as part of activating/deactivating the views. From the SDK page of viewWillAppear;</p> <blockquote> <p>If the view belonging to a view controller is added to a view hierarchy directly, the view controller will not receive this message. If you insert or add a view to the view hierarchy, and it has a view controller, you should send the associated view controller this message directly.</p> </blockquote> <p><strong>Update:</strong></p> <p>With the new details the problem is clear: This is a situation where you must send the disappear/appear messages yourself as suggested by the SDK. These functions are not called automagically when views are directly inserted/removed/changed, they are used by higher-level code (such as UINavigationController) that provides hierarchy support.</p> <p>If you think about your example of using exchangeSubView then nothing is disappearing, one view just happens to cover the other wholly or partially depending on their regions and opacity.</p> <p>I would suggest that if you wish to swap views then you really do remove/add as needed, and manually send the viewWillAppear / viewWillDisappear notifications to their controllers.</p> <p>E.g.</p> <pre><code>// your top level view controller -(void) switchActiveView:(UIViewController*)controller animated:(BOOL)animated { UIController* removedController = nil; // tell the current controller it'll disappear and remove it if (currentController) { [currentController viewWillDisapear:animated]; [currentController.view removeFromSuperView]; removedController = currentController; } // tell the new controller it'll appear and add its view if (controller) { [controller viewWillAppear:animated]; [self.view addSubView:controller.view]; currentController = [controller retain]; } // now tell them they did disappear/appear [removedController viewDidDisappear: animated]; [currentController viewDidAppear: animated]; [removedController release]; } </code></pre>
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    1. POHow do I have a view controller run updating code when it is brought to the top of the stack of views?
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    1. USAndrew Grant
    1. USAndrew Grant
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    1. POHow do I have a view controller run updating code when it is brought to the top of the stack of views?
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    1. COI've aded more comments. CAn you provide a bit more detail about "[sending] the associated view controller [the] message directly."
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      1. USMichael T. Smith
    2. COWorked out beautifully. Much smarter solution to remove/add then to exchange. Thanks Andrew.
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      1. USMichael T. Smith
 

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