PageViewController 显示黑屏 [英] PageViewController showing a black screen

问题描述

在故事板中，我有一个 UIPageViewController，这是我的代码

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
    }

这是我在故事板中的 ReservedTimesTableViewController

但是我得到了一个黑屏.为什么它不能正常工作?

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

推荐答案

在加载控制器时，您必须使用此代码设置初始页面

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
}

当您尝试滚动页面后，数据源方法将完成其工作.

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

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