我使用 Sprite 套件和场景在 Xcode 中开发了一款游戏。现在我正在尝试集成将高分发布到 Twitter 和 Facebook 的功能。我环顾四周，大多数人都说使用 SLComposeServiceViewController 很好，直到我尝试展示它。因为我的应用程序真的只使用场景，所以它们从来没有成员函数“presentViewController(....)”。因此，我无法展示它。有人知道解决这个问题的方法吗？

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {

    let touch:UITouch = touches.first!
    let touchLocation = touch.location(in: self)
    let touchedNode = self.atPoint(touchLocation)

    if (touchedNode.name == "tryAgain") {
        let nextScene = Scene_LiveGame(size: self.scene!.size)
        nextScene.scaleMode = self.scaleMode
        self.view?.presentScene(nextScene, transition: SKTransition.fade(withDuration: 0.5))
    }
    else if (touchedNode.name == "share") {

        if SLComposeViewController.isAvailable(forServiceType: SLServiceTypeFacebook) {

        let fShare = SLComposeViewController(forServiceType: SLServiceTypeFacebook)



        self.presentViewController(fShare!, animated: true, completion: nil)
         //^This is where my problem is. Xcode is telling me that self has no member function presentViewController which I totally understand, because its a scene and thus doesn't share those functions. But every resource online has shown me this is the only way to do it   

        }

    }

最佳答案

您收到此错误是因为您需要从另一个 UIViewController 呈现一个 UIViewController。所以

self.presentViewController(...)

将不起作用，因为 self (SKScene) 不是 UIViewController。要从 SKScene 进行演示，您必须这样说

view?.window?.rootViewController?.presentViewController(fShare!, animated: true, completion: nil)

我建议您不要再使用这些 API。最好使用 UIActivityViewController 来满足您的共享需求。这样一来，您的应用程序中只需要一个分享按钮，您就可以分享到各种服务(电子邮件、Twitter、Facebook、iMessage、WhatsApp 等)。

创建一个新的 Swift 文件并添加此代码。

enum ShareMenu {

    static func open(text: String, image: UIImage?, appStoreURL: String?, from viewController: UIViewController?) {
        guard let viewController = viewController, let view = viewController.view else { return }

    // Activity items
    var activityItems = [Any]()

    // Text
    activityItems.append(text)

    // Image
    if let image = image {
        activityItems.append(image)
    }

    /// App url
    if let appStoreURL = appStoreURL {
        let items = ActivityControllerItems(appStoreURL: appStoreURL)
        activityItems.append(items)
    }

    // Activity controller
    let activityController = UIActivityViewController(activityItems: activityItems, applicationActivities: nil)

    // iPad settings
    if UIDevice.current.userInterfaceIdiom == .pad {
        activityController.modalPresentationStyle = .popover
        activityController.popoverPresentationController?.sourceView = view
        activityController.popoverPresentationController?.sourceRect = CGRect(x: view.bounds.midX, y: view.bounds.midY, width: 0, height: 0)
        activityController.popoverPresentationController?.permittedArrowDirections = UIPopoverArrowDirection.init(rawValue: 0)
    }

    // Excluded activity types
    activityController.excludedActivityTypes = [
        .airDrop,
        .print,
        .assignToContact,
        .addToReadingList,
    ]

    // Present
    DispatchQueue.main.async {
        viewController.present(activityController, animated: true)
    }

    // Completion handler
    activityController.completionWithItemsHandler = { (activity, success, items, error) in
        guard success else {
            if let error = error {
                print(error.localizedDescription)
            }
            return
        }

            // do something if needed
       }
   } 
}
// MARK: - Activity Controller Items

/**
 ActivityControllerItems
 */
private final class ActivityControllerItems: NSObject {

    // MARK: - Properties

    /// App name
    fileprivate let appName = Bundle.main.infoDictionary?["CFBundleName"] as? String ?? "-"

    /// App store web url
    fileprivate let appStoreURL: String

    // MARK: - Init

    /// Init
    fileprivate init(appStoreURL: String) {
        self.appStoreURL = appStoreURL
        super.init()
    }
}

// MARK: - UIActivityItemSource

/// UIActivityItemSource
extension ActivityControllerItems: UIActivityItemSource {

    /// Getting data items

    /// Placeholder item
    func activityViewControllerPlaceholderItem(_ activityViewController: UIActivityViewController) -> Any {
        return ""
    }

    /// Item for actity type
    func activityViewController(_ activityViewController: UIActivityViewController, itemForActivityType activityType: UIActivityType) -> Any? {
        return URL(string: appStoreURL) ?? appName
    }

    /// Provide info about data items

    /// Subject field for services such as email
    func activityViewController(_ activityViewController: UIActivityViewController, subjectForActivityType activityType: UIActivityType?) -> String {
        return appName
    }
}

当按下分享按钮时，你可以这样调用它

 ShareMenu.open(
     text: "Can you beat my score?", 
     image: UIImage(...),  // set to nil if unused
     appStoreURL: "your iTunes app store URL",  // set to nil if unused
     from: view?.window?.rootViewController
 )

请记住，图片和 appStoreURL 不会随处可见，这取决于共享服务。

您还可以使用场景中的得分值并将其添加到文本中，例如

ShareMenu.open( 
     text: "Can you beat my score \(self.score)?",
     ...
)

希望对你有帮助

关于ios - 在 Xcode Scenes Swift iOS 中集成 Facebook 和 Twitter，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/43048176/