Please tell me about the methods
pageViewController(pageViewController: UIPageViewController, viewControllerAfterViewController viewController: UIViewController) -> UIViewController? and
pageViewController(pageViewController: UIPageViewController, viewControllerBeforeViewController viewController: UIViewController) -> UIViewController? Namely, it is of interest at what moment they are called and what is passed to them as a viewController?
pageViewController(pageViewController: UIPageViewController, viewControllerAfterViewController viewController: UIViewController) -> UIViewController? Returns the next UIViewController after the current one or nil if the current UIViewController last.
pageViewController(pageViewController: UIPageViewController, viewControllerBeforeViewController viewController: UIViewController) -> UIViewController? accordingly, returns the previous UIViewController before the current one, or nil if the current UIViewController first.
Are required. They are necessary for navigation (transition, flipping) on your set of UIViewController s. Called at the moment when the transition starts from the current to the next / previous UIViewController .
Source: https://ru.stackoverflow.com/questions/522188/
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