PagedMediaViewControllerDelegate.swift

extension PagedMediaViewController: UIPageViewControllerDelegate {
	
	func pageViewController(_ pageViewController: UIPageViewController, didFinishAnimating finished: Bool, previousViewControllers: [UIViewController], transitionCompleted completed: Bool) {
		guard
			let mediaVCs = pageViewController.viewControllers as? [MediaViewController],
			let currIndex = mediaItems.firstIndex(of: mediaVCs[0].mediaItem)
		else { return }

		currentIndex = currIndex
	}


	// If you want to specify the interface orientations you want to support, implement these as well:
	func pageViewControllerSupportedInterfaceOrientation(_ pageViewController: UIPageViewController) -> UIInterfaceOrientationMask {
		// example
		.allButUpsideDown
	}

	func pageViewControllerPreferredInterfaceOrientationForPresentation(_ pageViewController: UIPageViewController) -> UIInterfaceOrientationMask {
		// example
		.portrait
	}
}