blocks|key|3135735|text|对于何时以及何时不调用willMove/didMove方法，UIViewController文档非常清楚。查看"Implementing+a+Container+View+Controller"文档。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3135736|文档上说，如果不重写addChildViewController，就不必调用willMoveToParentViewController:方法。但是，您确实需要在转换完成后调用didMoveToParentViewController:方法。同样，容器视图控制器负责在调用removeFromParentViewController方法之前调用willMoveToParentViewController:方法。removeFromParentViewController方法调用子视图控制器的didMoveToParentViewController:方法。|3135737|此外，还提供了一个here示例和示例代码here。|3135738|祝好运|3135739|entityMap|0|LINK|mutability|MUTABLE|url|http://developer.apple.com/library/ios/documentation/uikit/reference/UIViewController_Class/Reference/Reference.html#//apple_ref/doc/uid/TP40006926-CH3-SW81|1|https://stackoverflow.com/questions/8146253/animate-change-of-view-controllers-without-using-navigation-controller-stack-su/8198515#8198515|2|https://github.com/toolmanGitHub/stackedViewControllers^0|B|8|K|7|U|G|1J|16|0|0|A|M|12|V|2G|U|3S|U|4S|V|5Q|U|6V|U|0|9|4|1|K|4|2|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@$9|Y|A|Z|B|C]|$9|10|A|11|B|C]|$9|12|A|13|B|C]]|D|@$9|14|A|15|1|16]]|E|$]]|$1|F|3|G|5|6|7|17|8|@$9|18|A|19|B|C]|$9|1A|A|1B|B|C]|$9|1C|A|1D|B|C]|$9|1E|A|1F|B|C]|$9|1G|A|1H|B|C]|$9|1I|A|1J|B|C]|$9|1K|A|1L|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|1M|8|@]|D|@$9|1N|A|1O|1|1P]|$9|1Q|A|1R|1|1S]]|E|$]]|$1|J|3|K|5|6|7|1T|8|@]|D|@]|E|$]]|$1|L|3|-4|5|6|7|1U|8|@]|D|@]|E|$]]]|M|$N|$5|O|P|Q|E|$R|S]]|T|$5|O|P|Q|E|$R|U]]|V|$5|O|P|Q|E|$R|W]]]]

The <code>UIViewController</code> docs are pretty clear on when and when not to call <code>willMove</code>/<code>didMove</code> methods. Check out the <a href="http://developer.apple.com/library/ios/documentation/uikit/reference/UIViewController_Class/Reference/Reference.html#//apple_ref/doc/uid/TP40006926-CH3-SW81" rel="nofollow noreferrer">"Implementing a Container View Controller"</a> documentation. 

The docs say, that if you do not override <code>addChildViewController</code>, you do not have to call <code>willMoveToParentViewController:</code> method. However you do need to call the <code>didMoveToParentViewController:</code> method after the transition is complete. "Likewise, it is is the responsibility of the container view controller to call the <code>willMoveToParentViewController:</code> method before calling the <code>removeFromParentViewController</code> method. The <code>removeFromParentViewController</code> method calls the <code>didMoveToParentViewController:</code> method of the child view controller."

Also, there is an example worked out <a href="https://stackoverflow.com/questions/8146253/animate-change-of-view-controllers-without-using-navigation-controller-stack-su/8198515#8198515">here</a> and sample code <a href="https://github.com/toolmanGitHub/stackedViewControllers" rel="nofollow noreferrer">here</a>.

Good Luck

blocks|key|248998|text|此部分不正确：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|248999|[vc+willMoveToParentViewController:self];
[self+addChildViewController:vc];
[self.view+addSubview:vc.view];+//+or+something+like+this.
[vc+didMoveToParentViewController:self];|code-block|syntax|javascript|249000|According+to+the+docs:|offset|length|249001|249002|当您的自定义容器调用addChildViewController:方法时，它会在添加视图控制器之前自动调用要作为子级添加的视图控制器的willMoveToParentViewController:方法。|blockquote|249003|249004|249005|因此，您不需要调用[vc+willMoveToParentViewController:self]。当您调用[self+addChildViewController:vc]时，它会自动完成。下面是代码示例：|style|CODE|249006|[self+addChildViewController:vc];
//+[vc+willMoveToParentViewController:self]+called+automatically
[self.view+addSubview:vc.view];+//+or+something+like+this.
[vc+didMoveToParentViewController:self];|249007|For+removing+view+controllers:|249008|249009|+removeFromParentViewController方法在移除子视图控制器之后，会自动调用子视图控制器的didMoveToParentViewController:方法。|249010|249011|249012|这个调用大概是[oldVC+didMoveToParentViewController:nil]。|249013|[vc+willMoveToParentViewController:nil];
[vc.view+removeFromSuperview];
[vc+removeFromParentViewController];
//+[vc+didMoveToParentViewController:nil]+called+automatically|249014|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIViewController_Class/Reference/Reference.html#//apple_ref/occ/instm/UIViewController/willMoveToParentViewController:|1|https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIViewController_Class/Reference/Reference.html#//apple_ref/occ/instm/UIViewController/didMoveToParentViewController:^0|0|0|0|M|0|0|0|0|0|0|9|14|1I|W|0|0|0|U|1|0|0|0|0|0|7|15|0|0^^$0|@$1|2|3|4|5|6|7|1H|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|1I|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|1J|8|@]|9|@$I|1K|J|1L|1|1M]]|A|$]]|$1|K|3|-4|5|6|7|1N|8|@]|9|@]|A|$]]|$1|L|3|M|5|N|7|1O|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|1P|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|1Q|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|1R|8|@$I|1S|J|1T|S|T]|$I|1U|J|1V|S|T]]|9|@]|A|$]]|$1|U|3|V|5|D|7|1W|8|@]|9|@]|A|$E|F]]|$1|W|3|X|5|6|7|1X|8|@]|9|@$I|1Y|J|1Z|1|20]]|A|$]]|$1|Y|3|-4|5|6|7|21|8|@]|9|@]|A|$]]|$1|Z|3|10|5|N|7|22|8|@]|9|@]|A|$]]|$1|11|3|-4|5|6|7|23|8|@]|9|@]|A|$]]|$1|12|3|-4|5|6|7|24|8|@]|9|@]|A|$]]|$1|13|3|14|5|6|7|25|8|@$I|26|J|27|S|T]]|9|@]|A|$]]|$1|15|3|16|5|D|7|28|8|@]|9|@]|A|$E|F]]|$1|17|3|-4|5|6|7|29|8|@]|9|@]|A|$]]]|18|$19|$5|1A|1B|1C|A|$1D|1E]]|1F|$5|1A|1B|1C|A|$1D|1G]]]]

This part is not correct:

<pre><code>[vc willMoveToParentViewController:self];
[self addChildViewController:vc];
[self.view addSubview:vc.view]; // or something like this.
[vc didMoveToParentViewController:self];
</code></pre>

<a href="https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIViewController_Class/Reference/Reference.html#//apple_ref/occ/instm/UIViewController/willMoveToParentViewController:" rel="noreferrer">According to the docs:</a>

<blockquote>
 When your custom container calls the addChildViewController: method, it automatically calls the willMoveToParentViewController: method of the view controller to be added as a child before adding it.
</blockquote>

So you don't need the <code>[vc willMoveToParentViewController:self]</code> call. It is done automatically when you call <code>[self addChildViewController:vc]</code>. Here's the code sample again:

<pre><code>[self addChildViewController:vc];
// [vc willMoveToParentViewController:self] called automatically
[self.view addSubview:vc.view]; // or something like this.
[vc didMoveToParentViewController:self];
</code></pre>

<a href="https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIViewController_Class/Reference/Reference.html#//apple_ref/occ/instm/UIViewController/didMoveToParentViewController:" rel="noreferrer">For removing view controllers:</a>

<blockquote>
 The removeFromParentViewController method automatically calls the didMoveToParentViewController: method of the child view controller after it removes the child.
</blockquote>

Presumably this call is <code>[oldVC didMoveToParentViewController:nil]</code>.

<pre><code>[vc willMoveToParentViewController:nil];
[vc.view removeFromSuperview];
[vc removeFromParentViewController];
// [vc didMoveToParentViewController:nil] called automatically
</code></pre>

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.

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.

Scenario 1: Moving from no parent to a new parent view controller

<pre><code>[vc willMoveToParentViewController:self];
[self addChildViewController:vc];
[self.view addSubview:vc.view]; // or something like this.
[vc didMoveToParentViewController:self];
</code></pre>

Do the first two lines have to occur in the order given, or can they be reversed?

Scenario 2: Moving from a parent view controller to no parent view controller

<pre><code>[vc willMoveToParentViewController:nil];
[vc.view removeFromSuperview];
[vc removeFromParentViewController];
</code></pre>

Is it also necessary to call <code>[vc didMoveToParentViewController:nil]</code>? The examples in Session 102 did not do this in this scenario, but I don't know whether that was an omission or not.

Scenario 3: Moving from one parent view controller to another

This will likely occur in the following way, because the logic in each parent view controller will be encapsulated.

<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>

Questions

My main question is this: Is this how view controller containment should work, in general? Are the mechanics given above correct?

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?

Is it necessary to call <code>didMoveToParentViewController:nil</code> after calling <code>removeFromParentViewController</code>?

How does View Controller Containment work in iOS 5?

容器

在WWDC2011 Session 102中，苹果引入了View Controller Containment，这是一种创建自定义视图控制器容器的能力，类似于UITabBarController、UINavigationController等。我看了几遍这些例子。与此模式相关的方法有很多，但要准确地弄清楚它们有点困难。...

问视图控制器容器在iOS 5中是如何工作的？
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