在Xcode场景中集成Facebook和Twitter Swift iOS

Question

我在Xcode中使用精灵套件和场景开发了一款游戏。现在我正在尝试整合功能，将高分发布到twitter和Facebook。我环顾四周，大多数人都说使用SLComposeServiceViewController这很好，直到我尝试并呈现它。因为我的应用程序确实只使用场景，所以它们从来没有成员函数“presentViewController（....）”。因此，我无法提供它。任何人都知道任何方式？

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 

     } 

    } 

Answer 1

我不会进入SLComposeViewController相关的代码。除了crashoverride777提出的方法之外，我只会向您展示两种技术。因此，第一种技术是使用通知，像这样：

GameScene：

import SpriteKit 

let kNotificationName = "myNotificationName" 

class GameScene: SKScene { 


    private func postNotification(named name:String){ 

     NotificationCenter.default.post(
      Notification(name: Notification.Name(rawValue: name), 
         object: self, 
         userInfo: ["key":"value"])) 
    } 

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


     self.postNotification(named: kNotificationName) 

    } 
} 

在这里，您可以通过点击屏幕上张贴的通知。期望的视图控制器类可以侦听此通知，例如：

import UIKit 
import SpriteKit 

class GameViewController: UIViewController { 

    override func viewDidLoad() { 
     super.viewDidLoad() 


     NotificationCenter.default.addObserver(
      self, 
      selector: #selector(self.handle(notification:)), 
      name: NSNotification.Name(rawValue: kNotificationName), 
      object: nil) 

     if let view = self.view as! SKView? { 
      // Load the SKScene from 'GameScene.sks' 
      if let scene = GameScene(fileNamed: "GameScene") { 
       // Set the scale mode to scale to fit the window 
       scene.scaleMode = .aspectFill 

       // Present the scene 
       view.presentScene(scene) 
      } 
     } 
    } 

    func handle(notification:Notification){ 
     print("Notification : \(notification)") 
    } 
} 

在这里，我们添加自作为该通知观察者 - 意味着，当通知发生时，一个适当的处理方法将被调用（这是我们的自定义handle(notification:)方法。在这种方法中，你应该打电话给你的代码：

if SLComposeViewController.isAvailable(forServiceType: SLServiceTypeFacebook) { 
    let fShare = SLComposeViewController(forServiceType: SLServiceTypeFacebook) 
    self.presentViewController(fShare!, animated: true, completion: nil) 
} 

事实上，我会写的代表团另一个例子，保持干净的东西:)

Answer 2

，因为你需要从其他的UIViewController提出一个UIViewController您收到此错误。所以

self.presentViewController(...) 

不会工作，因为自我（SKScene）不是UIViewController。从SKScene介绍，你会不得不说这

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

我建议你不要使用那些API了。更好地使用UIActivityViewController来满足您的共享需求。这样，您只需在应用程序中使用一个共享按钮，即可共享各种服务（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 
    } 
} 

当按下分享按钮比你可以把它像这样

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 
) 

记住，图像和appStoreURL不会出现遍地开花，这取决于共享服务。

您也可以从场景中使用你的分数值，并将它添加到文本e.g

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

希望这有助于

Answer 3

正如我所说的，这是可以使用的通知完成，像this answer，或者您可以与委托一起去：

首先，您应该声明MyDelegate协议，该协议定义了一种名为myMethod()的方法。

protocol MyDelegate:class { 

     func myMethod() 
    } 

该方法是要求每个类必须实现，如果它符合这个协议。

在我们的例子中，你可以看看在现场为工人和视图控制器作为老板。场景完成任务后，它会通知老板（向他​​委派有关工作完成情况），以便老板可以决定下一步是什么。我的意思是，我可以说：“这个场景是一个老板，它将责任交给了他的员工，视图控制员......”但是，你认为谁是老板，并不重要...... delegation pattern很重要。

因此，视图控制器，应符合本协议，它会执行myMethod()（将通过场景后来被称为）：

class GameViewController: UIViewController, MyDelegate { 

override func viewDidLoad() { 
    super.viewDidLoad() 

    //MARK: Conforming to MyDelegate protocol 

    if let view = self.view as! SKView? { 
     // Load the SKScene from 'GameScene.sks' 
     if let scene = GameScene(fileNamed: "GameScene") { 
      // Set the scale mode to scale to fit the window 
      scene.scaleMode = .aspectFill 

      scene.myDelegate = self 

      // Present the scene 
      view.presentScene(scene) 
     } 
    } 
    } 

func myMethod(){ 
    print("Do your stuff here") 
} 


} 

而且这里距离GameScene代码，你定义myDelegate的性质，我们用我们的视图控制器进行通信：

import SpriteKit 

class GameScene: SKScene { 


    weak var myDelegate:MyDelegate? 



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


    self.myDelegate?.myMethod() 

    } 
} 

要了解当选择了通知和代表团反之亦然看看this article（或只是搜索所以，有一些关于此的好帖子）。