有一个包含 3 个 View Controller (V1、V2 和 V3)的容器 View 。我可以通过向左或向右滑动来从 A、B 或 C 切换。 A 或 B 都包含自己的 Collection View 。如果我点击 A 或 B 内 Collection View 中的任何单元格，PlayerVC(在上图中名为 Player ^^)启动并开始使用 AVPlayer 播放视频。

问题是:由于我使用的是通用链接，因此用户会直接进入 playerView 播放视频，但是当他们按下完成按钮时，应用程序会崩溃。我相信的问题是因为 View Controller 上的其余部分未初始化？如何初始化容器 View 和其他 View Controller ？或者，如果这不是问题所在，请告诉我问题所在。

这是带有一些示例代码的应用委托(delegate)。请尽可能提供代码以提供帮助!

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

    if let pagingViewController = window?.rootViewController as? PagingViewController {
        pagingViewController.videoPlaybackManager = videoPlaybackManager
    }
    return true
}



    class AppDelegate: UIResponder, UIApplicationDelegate {
    // Other App Delegate methods.....

    func application(_ application: UIApplication, continue userActivity: NSUserActivity, restorationHandler: @escaping ([Any]?) -> Void) -> Bool {

        // 1) Make sure the passed `user activity` has expected characteristics.
        guard userActivity.activityType == NSUserActivityTypeBrowsingWeb, let url = userActivity.webpageURL else {
            return false
        }

        // HELP: I need to get to `PlayerVC` from here?

        return true

        // If we can't do the above we default to opening the page in safari
    }
}

编辑 - 我如何在 PagingViewController(容器 View )中实例化 3 个 VC 的附加代码

  private func setupViewControllers() {
        let storyboard = UIStoryboard(name: "Main", bundle: nil)

        page1 = storyboard.instantiateViewController(withIdentifier: StoryboardIdentifiers.feedViewController.rawValue) as! FeedViewController
        page1.view.translatesAutoresizingMaskIntoConstraints = false
        page1.delegate = self
        scrollView.addSubview(page1.view)
        addChildViewController(page1)
        page1.didMove(toParentViewController: self)
        // Inject dependency.
        page1.videoPlaybackManager = videoPlaybackManager

        page2 = storyboard.instantiateViewController(withIdentifier: StoryboardIdentifiers.favoritesViewController.rawValue) as! FavoritesViewController
        page2.view.translatesAutoresizingMaskIntoConstraints = false
        page2.delegate = self
        scrollView.addSubview(page2.view)
        addChildViewController(page2)
        page2.didMove(toParentViewController: self)

        page3 = storyboard.instantiateViewController(withIdentifier: StoryboardIdentifiers.settingsViewController.rawValue) as! SettingsViewController
        page3.view.translatesAutoresizingMaskIntoConstraints = false
        scrollView.addSubview(page3.view)
        addChildViewController(page3)
        page3.didMove(toParentViewController: self)
......

最佳答案

如果您正在处理 UIPageViewController，要设置正确的子 UIViewController，您可以:

// In PagingViewController
func loadChildViewControllerFromUniversalLink(myParameter: Bool) {
    // The condition you need to satisfied in order to present
    // the correct child view controller
    if  myParameter { // is satisfied
        let universalLinkVc = MyChildViewController() // load your VC here
        let direction : UIPageViewControllerNavigationDirection = .forward // or .reverse, as you wish
        self.setViewControllers([universalLinkVc], direction: direction, animated: animated, completion: nil)
    }
}

然后在你的AppDelegate的application(_ application: UIApplication, continue userActivity: NSUserActivity, restorationHandler: @escaping ([Any]?) -> Void) -> Bool:

myPagingViewControllerInstance.loadChildViewControllerFromUniversalLink(true)

关于ios - 如何从 AppDelegate 实例化多个 View Controller ？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/43215568/