Thanks Roland for your answer. Sorry for the unclarity of my question.

You completely answered my question.

I wondered about this point because I come from the OSX development and there 
is not (as far as I know) this concept of child/parent.

Colas

Le 1 mai 2015 à 06:47, cocoa-dev-requ...@lists.apple.com a écrit :

> Had some difficulty completing understanding what you’re trying to do here 
> but I think you’re not right in this instance. 
> 
> I’ll try putting it another way. If you have a view controller and its view 
> contains subviews which are the views of a different view controller, then 
> you must use the addChildViewController and other methods to make a correct 
> hierarchy of view controllers. Any use of another view controller’s view in 
> your view controller’s view requires that you set up (and tear down) the view 
> controller parent child relationship. if you don’t, rotation won’t work, the 
> view appearance/disappearance methods won’t work and various other methods 
> passed down from view controller to view controller won’t work. 
> 
> So in your case it seems like your MyCustomVC’s view has, as subview, a 
> fbView which is the ‘view’ of a FacebookVC. Before you add that view to your 
> MyCustomVC’s view’s hierarchy you must make the FacebookVC a child of your 
> MyCustomVC. 
> 
> TL;DR; If your VC’s view embeds a view from another VC, you must set up a 
> parent-child relationship between the VCs

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