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    <p><strong>UPD: June, 2015</strong> <strong>Swift</strong></p> <p>The concept remains the same, which is described below in Objective-C section. There is a little change in syntax. To add childviewcontroller use following snippet:</p> <pre><code>let aViewController = storyboard.instantiateViewControllerWithIdentifier("A") as! AViewController; addChildViewController(aViewController); scrollView!.addSubview(aViewController.view) aViewController.didMoveToParentViewController(self) </code></pre> <p>Check my <a href="https://github.com/gneil90/CustomScrollContainer">Swift Github Sample Code</a></p> <p><strong>Objective-C</strong></p> <p>Create your own custom container view controller (I will call it combinedViewController), which will hold your three controllers in scroll view. Inherit like you always do UIViewController, then use addChildViewController public API in your new combinedViewController <code>-viewDidLoad:</code> like this:</p> <pre><code>[self addChildViewController:aViewController]; [self.scrollView addSubview:aViewController.view]; [aViewController didMoveToParentViewController:self]; </code></pre> <p>Here’s what the code does:</p> <ul> <li>It calls the container’s addChildViewController: method to add the child.</li> <li>It accesses the child’s view property to retrieve the view and adds it to its own view hierarchy. The container sets the child’s size and position before adding the view; containers always choose where the child’s content appears.</li> <li>It explicitly calls the child’s didMoveToParentViewController: method to signal that the operation is complete.</li> </ul> <p>Do this operation with each of your viewControllers. Afterwards, set your combinedViewController as a rootViewController. </p> <p>if you need further explanation, feel free to ask.</p> <p>Reference: <a href="https://developer.apple.com/library/ios/featuredarticles/ViewControllerPGforiPhoneOS/CreatingCustomContainerViewControllers/CreatingCustomContainerViewControllers.html#//apple_ref/doc/uid/TP40007457-CH18-SW6">Design custom container view controller</a></p> <p>Here you are my <a href="https://github.com/gneil90/CustomContainerViewController">Objective-C Github sample code</a></p> <p><strong>UPD:</strong> Thanks @Oliver Atkinson for clarifying that <code>addChildViewController:</code> method also calls the child’s <code>willMoveToParentViewController:</code> method automatically. </p> <p><strong>Results:</strong></p> <p><a href="https://i.stack.imgur.com/PrjPZ.gif"><img src="https://i.stack.imgur.com/PrjPZ.gif" alt="enter image description here"></a></p>
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    1. COThank you very much for this answer, but I'm a little lost; I'm really quite new to Objective-C and I'm still learning. I created a new viewcontroller and imported the header files of my 3 view controllers. I tried copying your code, and replacing aViewController with BarsViewController, but it said, "No known class method for selector 'willMovetoViewController:'", along with other different errors on all the lines. Is that what I'm supposed to do? Sorry about this.
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    2. COsorry my mistake, you should write `-willMoveToParentViewController:`
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    3. COI don't that works either- it gives the same error, "No known class method for selector 'willMovetoParentViewController:'". Am I not doing this right?
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