title: How to add ViewController to UIPageViewController
body: <p>I got a UIPageViewController on my storyboard, and now I'm wondering how do I add a view controller to it? Lets say if I got 5 view controllers, how do I add those from the beginning to the end to the UIPageViewController? Normally I would do this:</p>
  
  <pre><code>        [self addChildViewController:firstViewController];
          [self addChildViewController:secondViewController];
          [self addChildViewController:thridViewController];
          [self addChildViewController:fourthViewController];
          [self addChildViewController:fifthViewController];
  </code></pre>
  
  <p>But I'm not sure how to add this on the UIPageViewController in this order...</p>
  
  <p><strong>EDIT:</strong></p>
  
  <pre><code>ChapterViewController *chapterViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"ChapterView"];
  NSArray *viewControllers = [NSArray arrayWithObject:chapterViewController];
  
  [self setViewControllers:viewControllers
                           direction:UIPageViewControllerNavigationDirectionForward
                            animated:NO
                completion:^(BOOL finished){
                    NSLog(@"call back success");}];
  </code></pre>