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POviewController.view.superview is nil
 

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    <p>I'm trying to implement a page-scroll functionality in my project. I develop for iOS 5, with storyboards (and ARC). This is what I did in my storyboard :</p> <p><img src="https://i.stack.imgur.com/T7CGm.png" alt="enter image description here"></p> <p>The first viewController (on the left) has a scrollView and a pageControl. Its class is called <code>GlobalDashboardViewController</code>, and inherits from the class <code>DashboardViewController</code> (which inherits from <code>UIViewController</code>). The other 2 controllers are simple UIViewControllers with identifiers (<em>MainDashboard</em> and <em>SecondaryDashboard</em>).</p> <p>In <code>GlobalDashboardViewController.m</code>, there is only a viewDidLoad, which gets the childViewControllers :</p> <pre><code>- (void)viewDidLoad { [super viewDidLoad]; [self addChildViewController:[self.storyboard instantiateViewControllerWithIdentifier:@"MainDashboard"]]; [self addChildViewController:[self.storyboard instantiateViewControllerWithIdentifier:@"SecondaryDashboard"]]; } </code></pre> <p><code>DashboardViewController.m</code> is a bit more complex. Here are the most important methods :</p> <pre><code>- (void)viewDidLoad { // Calling the viewDidLoad above to populate the childViewControllers array [super viewDidLoad]; [self.scrollView setPagingEnabled:YES]; [self.scrollView setScrollEnabled:YES]; [self.scrollView setShowsHorizontalScrollIndicator:NO]; [self.scrollView setShowsVerticalScrollIndicator:NO]; [self.scrollView setDelegate:self]; } -(void)viewWillAppear:(BOOL)animated { [super viewWillAppear:animated]; self.pageControl.currentPage = 0; _page = 0; [self.pageControl setNumberOfPages:[self.childViewControllers count]]; UIViewController *viewController = [self.childViewControllers objectAtIndex:self.pageControl.currentPage]; if (viewController.view.superview != nil) { [viewController viewWillAppear:animated]; } self.scrollView.contentSize = CGSizeMake(scrollView.frame.size.width * [self.childViewControllers count], scrollView.frame.size.height); } </code></pre> <p>There are plenty of other methods, but I don't think they're relevant, because here is my problem: the app launches, and I see the scrollView and the pageControl. The background is dark gray, as I set it in the <em>GlobalDashboard</em> viewController. I can scroll correctly, and the pageControl is updated. But I don't see the other views. When I place a breakpoint at the <em>if</em> in <code>viewWillAppear</code>, and look at <code>viewController</code>, it's named correctly (<code>Dashboard Page 1</code>, which is the name I gave to the controller in the storyboard), but its <code>_view</code> property shows <em>0x00000000</em>, as you can see here :</p> <p><img src="https://i.stack.imgur.com/E0d3W.png" alt="enter image description here"></p> <p>So, I never get inside the <em>if</em>, which is where some of the magic of actually showing the viewControllers happens...</p> <p>My work is based on an example project you can find here : <a href="https://github.com/wannabegeek/PageViewController" rel="nofollow noreferrer">PageViewController</a>. When I run it, it works perfectly. I have no clue why I can't make it work in my own project.</p> <p>Any ideas ?</p> <p>Thanks</p>
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