FWIW: I'm not the author of the content presented here (which is an outline from Edmond Lau's book). I've just copy-pasted it from somewhere over the Internet, but I cannot remember what exactly the original source is. I was also not able to find the author's name, so I cannot give him/her the proper credits.
| import UIKit | |
| class ExerciseOption: Decodable { | |
| private enum ExerciseOptionCodingKeys: String, CodingKey { | |
| case id | |
| case appleHealthId = "apple_health_id" | |
| case googleFitId = "google_fit_id" | |
| case langsTranslation = "langs_translation" | |
| } | |
| class CarouselPageViewController: UIPageViewController { | |
| fileprivate var items: [UIViewController] = [] | |
| override func viewDidLoad() { | |
| super.viewDidLoad() | |
| dataSource = self | |
| decoratePageControl() | |
| populateItems() |
| // MARK: - DataSource | |
| extension CarouselPageViewController: UIPageViewControllerDataSource { | |
| // code ommited ... | |
| func presentationCount(for _: UIPageViewController) -> Int { | |
| return items.count | |
| } | |
| func presentationIndex(for _: UIPageViewController) -> Int { | |
| guard let firstViewController = viewControllers?.first, |
| // MARK: - DataSource | |
| extension CarouselPageViewController: UIPageViewControllerDataSource { | |
| func pageViewController(_: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? { | |
| guard let viewControllerIndex = items.index(of: viewController) else { | |
| return nil | |
| } | |
| let previousIndex = viewControllerIndex - 1 | |
| guard previousIndex >= 0 else { |
| class CarouselPageViewController: UIPageViewController { | |
| fileprivate var items: [UIViewController] = [] | |
| override func viewDidLoad() { | |
| super.viewDidLoad() | |
| dataSource = self | |
| populateItems() | |
| if let firstViewController = items.first { | |
| setViewControllers([firstViewController], direction: .forward, animated: true, completion: nil) |