StackOverflow2013

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Id
18453401
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0
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2
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2013-08-26T21:34:03.837
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2016-08-27T00:46:29.987
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2016-08-27T00:46:29.987
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1265393
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2
Score
86
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text
Body
I was wondering about this question too. I watched <a href="https://developer.apple.com/videos/play/wwdc2011/102/" rel="noreferrer">Session 102 of the WWDC 2011</a> videos and Mr. View Controller, <a href="https://twitter.com/twotothen" rel="noreferrer">Bruce D. Nilo</a>, said this: <blockquote> <code>viewWillAppear:</code>, <code>viewDidAppear:</code>, etc have nothing to do with <code>addChildViewController:</code>. All that <code>addChildViewController:</code> does is to say "This view controller is a child of that one" and it has nothing to do with view appearance. When they get called is associated with when views move in and out of the window hierarchy. </blockquote> So it seems that the call to <code>addChildViewController:</code> does very little. The side effects of the call are the important part. They come from the <code>parentViewController</code> and <code>childViewControllers</code> relationships. Here are some of the side effects that I know: <ul> <li>Forwarding appearance methods to child view controllers</li> <li>Forwarding rotation methods</li> <li>(Possibly) forwarding memory warnings</li> <li>Avoiding inconsistent VC hierarchies, especially in <code>transitionFromViewController:toViewController:…</code> where both VCs need to have the same parent</li> <li>Allowing custom container view controllers to take part in State Preservation and Restoration</li> <li>Taking part in the responder chain</li> <li>Hooking up the <code>navigationController</code>, <code>tabBarController</code>, etc properties</li> </ul>
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1. POWhat does addChildViewController actually do?
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1. USpkamb
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1. USnevan king
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1. POWhat does addChildViewController actually do?
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