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    <p>After looking for a lot.</p> <p>I receive that: </p> <pre><code>- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController; - (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController; </code></pre> <p>2 functions use to get pageViewController behind or in front of current pageViewController.</p> <p>I thinks it's difficult to get current pageViewController</p> <p>My suggestion:</p> <p>In UIPageViewControllerDelegate, it have a function :</p> <pre><code> - (void)pageViewController:(UIPageViewController *)pageViewController willTransitionToViewControllers:(NSArray *)pendingViewControllers; </code></pre> <p>This function to give you a pendingViewControllers array and this's current pageViewController array. So you can implement like that :</p> <pre><code>- (void)pageViewController:(UIPageViewController *)pageViewController willTransitionToViewControllers:(NSArray *)pendingViewControllers { if([pendingViewControllers count]&gt;0) { NSUInteger index =[(APPChildViewController*)[pendingViewControllers objectAtIndex:0] index]; if(index == 0) { self.view.backgroundColor = [UIColor redColor]; } if(index == 1) { self.view.backgroundColor = [UIColor blueColor]; } if(index == 2) { self.view.backgroundColor = [UIColor greenColor]; } } } </code></pre> <p>In viewDidLoad, you add :</p> <pre><code> self.pageController.delegate = self; self.view.backgroundColor = [UIColor redColor]; //set first background. </code></pre> <p>In 'APPViewController.h' you sure add:</p> <pre><code>@interface APPViewController : UIViewController&lt;UIPageViewControllerDataSource,UIPageViewControllerDelegate&gt; </code></pre> <p>Remember : remove this code (in 'viewControllerAtIndex' function)</p> <pre><code>if(index == 1) { self.view.backgroundColor = [UIColor redColor]; } if(index == 2) { self.view.backgroundColor = [UIColor blueColor]; } if(index == 3) { self.view.backgroundColor = [UIColor greenColor]; } </code></pre> <p>Let's me know if you have any questions.</p>
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    1. USNguyen Thi Thuy Trang
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    1. COthe delegate function is not getting called
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    2. COdo you add? : self.pageController.delegate = self;
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    3. COsorry, I forgot it
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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