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POHow does View Controller Containment work in iOS 5?
 

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  1. POHow does View Controller Containment work in iOS 5?
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    <p>In WWDC 2011 Session 102, Apple introduced View Controller Containment, which is the ability to create custom view controller containers, analogous to <code>UITabBarController</code>, <code>UINavigationController</code>, and the like.</p> <p>I watched the examples several times. There are a flurry of methods associated with this pattern, but it was a little hard to figure them out exactly. I'm going to post here what I think is going on and see if the community will confirm or disconfirm my suspicions.</p> <p><strong>Scenario 1: Moving from no parent to a new parent view controller</strong></p> <pre><code>[vc willMoveToParentViewController:self]; [self addChildViewController:vc]; [self.view addSubview:vc.view]; // or something like this. [vc didMoveToParentViewController:self]; </code></pre> <p>Do the first two lines have to occur in the order given, or can they be reversed?</p> <p><strong>Scenario 2: Moving from a parent view controller to no parent view controller</strong></p> <pre><code>[vc willMoveToParentViewController:nil]; [vc.view removeFromSuperview]; [vc removeFromParentViewController]; </code></pre> <p>Is it also necessary to call <code>[vc didMoveToParentViewController:nil]</code>? The examples in Session 102 <em>did not do this</em> in this scenario, but I don't know whether that was an omission or not.</p> <p><strong>Scenario 3: Moving from one parent view controller to another</strong></p> <p>This will likely occur in the following way, because the logic in each parent view controller will be encapsulated.</p> <pre><code>// In the old parent [vc willMoveToParentViewController:nil]; [vc.view removeFromSuperview]; [vc removeFromParentViewController]; // In the new parent [vc willMoveToParentViewController:self]; [self addChildViewController:vc]; [self.view addSubview:vc.view]; [vc didMoveToParentViewController:self]; </code></pre> <p><strong>Questions</strong></p> <p>My main question is this: Is this how view controller containment should work, in general? Are the mechanics given above correct?</p> <p>Is it necessary to call <code>willMoveToParentViewController</code> before calling <code>addChildViewController</code>? This seems like the logical order to me, but is it strictly necessary?</p> <p>Is it necessary to call <code>didMoveToParentViewController:nil</code> after calling <code>removeFromParentViewController</code>?</p>
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    1. USBartłomiej Semańczyk
    1. USGregory Higley
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    1. COThe problem was that when I tried to add the ios5 tag, I accidentally hit enter, which added the post even though I hadn't finished composing/editing it. I tried to delete it but then found that I could only *vote* to delete it.
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