Facebook 登录无法在 swift 中使用

Question

我试图在我的应用程序中实现 Facebook 登录，但当我尝试登录时，它会转到 Facebook 应用程序并返回到我的游戏，但登录按钮不会注销，并且如果我尝试获取任何信息（例如访问令牌），则授予权限或拒绝权限为零。这是我的代码：

import Foundation
class IntroScene: SKScene, FBSDKLoginButtonDelegate {
let loginButton: FBSDKLoginButton = {
    let button = FBSDKLoginButton()
    button.readPermissions = ["email"]
    return button
}()

override func didMove(to view: SKView) {
    self.backgroundColor = UIColor.black

    view.addSubview(loginButton)
    loginButton.center = (self.view?.center)!
    loginButton.delegate = self
}

func loginButtonDidLogOut(_ loginButton: FBSDKLoginButton!) {

}

func loginButtonWillLogin(loginButton: FBSDKLoginButton!) -> Bool {
    return true
}

func loginButton(_ loginButton: FBSDKLoginButton!, didCompleteWith result: FBSDKLoginManagerLoginResult!, error: Error!) {
    if(error == nil)
    {
        print("login complete")
        //print(FBSDKAccessToken.current()) -> crashes because its nil
        //print(result.grantedPermissions) -> crashes its nil
    }
    else{
        print(error.localizedDescription)
    }
}
}

我的 info.plist 如下所示：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>UIViewControllerBasedStatusBarAppearance</key>
    <false/>
    <key>LSApplicationQueriesSchemes</key>
    <array>
        <string>fbapi</string>
        <string>fb-messenger-api</string>
        <string>fbauth2</string>
        <string>fbshareextension</string>
    </array>
    <key>NSAppTransportSecurity</key>
    <dict>
        <key>NSExceptionDomains</key>
        <dict>
            <key>facebook.com</key>
            <dict>
                <key>NSIncludesSubdomains</key>
                <true/>
                <key>NSThirdPartyExceptionRequiresForwardSecrecy</key>
                <false/>
            </dict>
            <key>fbcdn.net</key>
            <dict>
                <key>NSIncludesSubdomains</key>
                <true/>
                <key>NSThirdPartyExceptionRequiresForwardSecrecy</key>
                <false/>
            </dict>
            <key>akamaihd.net</key>
            <dict>
                <key>NSIncludesSubdomains</key>
                <true/>
                <key>NSThirdPartyExceptionRequiresForwardSecrecy</key>
                <false/>
            </dict>
        </dict>
    </dict>
    <key>CFBundleURLTypes</key>
    <array>
        <dict>
            <key>CFBundleURLSchemes</key>
            <array>
            <string>//fbmyid</string>
        </array>
    </dict>
</array>
<key>FacebookAppID</key>
<string>//myid</string>
<key>FacebookDisplayName</key>
<string>Crazy Traffic Saga</string>
<key>CFBundleDevelopmentRegion</key>
<string>en</string>
<key>CFBundleExecutable</key>
<string>$(EXECUTABLE_NAME)</string>
<key>CFBundleIdentifier</key>
<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
<key>CFBundleInfoDictionaryVersion</key>
<string>6.0</string>
<key>CFBundleName</key>
<string>$(PRODUCT_NAME)</string>
<key>CFBundlePackageType</key>
<string>APPL</string>
<key>CFBundleShortVersionString</key>
<string>1.0</string>
<key>CFBundleSignature</key>
<string>????</string>
<key>CFBundleVersion</key>
<string>1</string>
<key>LSRequiresIPhoneOS</key>
<true/>
<key>UILaunchStoryboardName</key>
<string>LaunchScreen</string>
<key>UIMainStoryboardFile</key>
<string>Main</string>
<key>UIRequiredDeviceCapabilities</key>
<array>
    <string>armv7</string>
</array>
<key>UISupportedInterfaceOrientations</key>
<array>
    <string>UIInterfaceOrientationPortrait</string>
    <string>UIInterfaceOrientationLandscapeLeft</string>
    <string>UIInterfaceOrientationLandscapeRight</string>
</array>
<key>UISupportedInterfaceOrientations~ipad</key>
<array>
    <string>UIInterfaceOrientationPortrait</string>
    <string>UIInterfaceOrientationPortraitUpsideDown</string>
    <string>UIInterfaceOrientationLandscapeLeft</string>
    <string>UIInterfaceOrientationLandscapeRight</string>
</array>

Answer 1

感谢这篇文章：FB Login using Swift 3 not returned any values and not get back the user to the App after success Login 我发现了问题。还有一项功能需要添加到 App Delegate 中。这是我如何让 Facebook 登录正常工作

• 下载SDK并添加到项目中

• 根据Facebook网站设置info.plist

• 在应用程序委托中添加：

  func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
  // Override point for customization after application launch.
  FIRApp.configure()
  FBSDKApplicationDelegate.sharedInstance().application(application, didFinishLaunchingWithOptions: launchOptions)
  
  return true
  }
  
  public func application(_ app: UIApplication, open url: URL, options: [UIApplicationOpenURLOptionsKey : Any] = [:]) -> Bool {
  
      return FBSDKApplicationDelegate.sharedInstance().application(
          app,
          open: url as URL!,
          sourceApplication: options[UIApplicationOpenURLOptionsKey.sourceApplication] as! String,
      annotation: options[UIApplicationOpenURLOptionsKey.annotation]
  )
  }
  
  public func application(_ application: UIApplication, open url: URL,     sourceApplication: String?, annotation: Any) -> Bool {
          return FBSDKApplicationDelegate.sharedInstance().application(
              application,
              open: url as URL!,
              sourceApplication: sourceApplication,
              annotation: annotation)
  }
  

• 在 SKScene 中，我显示了按钮（也可以在视图控制器中）：

  class IntroScene: SKScene, FBSDKLoginButtonDelegate {
      override func didMove(to view: SKView) {
          self.backgroundColor = UIColor.black
          let loginButton = FBSDKLoginButton()
          loginButton.center = (self.view?.center)!
          self.view?.addSubview(loginButton)
          loginButton.frame = CGRect(x: 0, y: 0, width: 360, height: 60) // makes it bigger
          loginButton.center = CGPoint(x: self.frame.midX, y: self.frame.midY + 90)
          loginButton.delegate = self
          loginButton.readPermissions = ["public_profile", "email"]
          if let _ = FBSDKAccessToken.current(){
              //already logged in 
              fetchProfile()
          }
      }
      func fetchProfile() {
      let parameters = ["fields": "first_name, email, last_name, picture"]
  
      FBSDKGraphRequest(graphPath: "me", parameters: parameters).start(completionHandler: { (connection, user, requestError) -> Void in
  
          if requestError != nil {
              print("----------ERROR-----------")
              print(requestError)
              return
          }
          let userData = user as! NSDictionary
          let email = userData["email"] as? String
          let firstName = userData["first_name"] as? String
          let lastName = userData["last_name"] as? String
          var pictureUrl = ""
          if let picture = userData["picture"] as? NSDictionary, let data = picture["data"] as? NSDictionary, let url = data["url"] as? String {
              pictureUrl = url
              print(pictureUrl)
          }
       })
       }
  
  }