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20740893
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2013-12-23T09:48:59.933
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2013-12-23T10:03:41.540
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2013-12-23T10:03:41.540
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465677
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465677
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20734233
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2
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1
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text
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Your problem you're trying to solve is an asynchronous one. Your approach however is for solving a synchronous problem. For example, your class <code>CSAPromoModelController</code> is inherently asynchronous. This is because it's init method invokes an asynchronous method, and thus your class gets "infected" by asynchronism. You might consider a re-design, where class <code>CSAPromoModelController</code> becomes a subclass of <code>NSOperation</code> with a complete handler, e.g. <code>CSAPromoModelOperation</code>. It's eventual result is the array of images. The imageArray becomes an ivar of your <code>CSAPromoViewController</code>. The <code>CSAPromoViewController</code> will have a method for creating a <code>CSAPromoModelController</code> object which will be initialized with an image. The completion handler of the operation passes the array of images. Within the completion handler you basically execute the same statements as in your original <code>viewDidLoad</code> method in order to setup the controllers. You would use the operation as follows: <pre><code>- (void)viewDidLoad { [super viewDidLoad]; self.pageViewController = [[UIPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStyleScroll navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal options:nil]; self.pageViewController.delegate = self; NSURLRequest *request = ... CSAPromoModelOperation* op = [CSAPromoModelOperation alloc] initWithRequest:request completion:^(NSArray* result, NSError*error) { // assuming we are executing on the main thread! if (error == nil) { self.imageArray = result; CSAPageDataViewController* startingViewController = [self viewControllerWithImage:self.imageArray[0] storyboard:self.storyboard]; NSArray* viewControllers = @[startingViewController]; [self.pageViewController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:nil]; ... } else { // handle error } }]; [op start]; } </code></pre>
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