PageViewController showing a black screen

问题

In storyboard I have a UIPageViewController and this is my code

class ReservedTimesViewController: UIPageViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
}

extension ReservedTimesViewController: UIPageViewControllerDataSource {
    func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
        let controller = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "ReservedTimesTableViewController")
        print(controller)
   return controller
    }

    func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
        let controller = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "ReservedTimesTableViewController")
        print(controller)
        return controller
    }

and this is my ReservedTimesTableViewController in story board

but I'm getting a black screen. Why it's not working correct?

回答1:

On loading your controller you have to set your initial page by using this code

override func viewDidLoad() {
    super.viewDidLoad()
    dataSource = self;
    self.setViewControllers([getViewControllerAtIndex(index: 0)] as [UIViewController], direction: UIPageViewControllerNavigationDirection.forward, animated: false, completion: nil)
}

func getViewControllerAtIndex(index: Int) -> ReservedTimesTableViewController
{
    // Create a new view controller and pass suitable data.
    let reservedTimesTableViewController = self.storyboard?.instantiateViewController(withIdentifier: "ReservedTimesTableViewController") as! ReservedTimesTableViewController
    return reservedTimesTableViewController
}

After when you try to scroll your page then the datasource methods will do their work.

来源：https://stackoverflow.com/questions/42764230/pageviewcontroller-showing-a-black-screen

标签

ios

swift

xcode

uipageviewcontroller