PresentationViewController viewDidLoad

PresentationViewController.m

    self.pageViewController = [[UIPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStyleScroll navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal options:nil];
    
    self.dataSource = [PageViewControllerDataSource new];
    self.pageViewController.dataSource = self.dataSource;
    [self.pageViewController setViewControllers:@[[self.dataSource initialViewController]] direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:nil];
    
    
    // We need to add the pageViewController as a childViewController (so that the lifecycle methods get called together. And then we can add the main view of the pageViewController to this viewController's main view.
    [self addChildViewController:self.pageViewController];
    [self.view addSubview:self.pageViewController.view];
    [self.pageViewController didMoveToParentViewController:self];