我已经尝试了很多来实现将现有解析用户链接到 Facebook。

我正在使用 swift 3。

但是我找不到解决方案

我的状态是

1. 我已经有帐户，但未关联 Facebook。

2. 我想通过 facebookUtils 链接我的帐户

3. 我的应用有“登录或注册 Facebook”按钮

4. 它的工作原理如下

我的问题是

1. 我在点击 Facebook 登录按钮时没有登录。这意味着我没有 PFUser.current()

这是我想做的

1. 通过 facebookGraph API 获取电子邮件地址并通过查询电子邮件检查是否为用户

2. 我试过这样登录

试试吧! PFUser.logIn(withUsername: userObj.username!, password: userObj.password!)

但它不起作用，因为我无法获取密码。它总是返回零

1. 我尝试过链接 PFUser 对象，我通过 1 个查询结果获得了该对象

2. 我也试过这样的云函数

Parse.Cloud.define("fblink", function(request, response) {

var query = new Parse.Query(Parse.User);
query.equalTo("username", request.params.username);

query.first({
  success: function(object) {

       if (!Parse.FacebookUtils.isLinked(object)) {
              Parse.FacebookUtils.link(object, null, {
                success: function(user) {
                  alert("Woohoo, user logged in with Facebook!");
                    response.success(true);   
                },
                error: function(user, error) {
                  alert("User cancelled the Facebook login or did not fully authorize.");
                    response.success(false);   
                }
              });
            }
  },
  error: function(error) {
    console.log("Error: " + error.code + " " + error.message);
  }
});

});

但它不起作用...我认为云函数方法不是这种情况下的解决方案。

我发现了很多与将现有用户合并到 Facebook 授权数据相关的问题。但我找不到任何解决方案。

我希望能找到好的方法。

func fbBtnTapped() {

        //Show Activity indicator
        let spiningActivity = MBProgressHUD.showAdded(to: self.view, animated: true)
        spiningActivity?.labelText = "Loading"
        spiningActivity?.detailsLabelText = "Please Wait"


        let permissions = ["public_profile", "email"]


        PFFacebookUtils.logInInBackground(withReadPermissions: permissions, block: {(user:PFUser?, error:Error?) -> Void in

            if let user = user {
                if user.isNew {
                    print("User signed up and logged in through Facebook!")

                } khác {
                    print("User logged in through Facebook!")
                }
            } khác {
                print("Uh oh. The user cancelled the Facebook login.")

            }


            if(error != nil)
            {
                spiningActivity?.hide(true)

                print("in FBBUTTONTapped Error")
                // display an error message
                let userMessage = error!.localizedDescription
                let myAlert = UIAlertController(title: "Alert", message: userMessage, preferredStyle: UIAlertControllerStyle.alert)

                let okAction = UIAlertAction(title: "Ok", style: UIAlertActionStyle.default, handler: nil)

                myAlert.addAction(okAction)

                self.present(myAlert, animated: true, completion: nil)
                trở lại
            }

            // Load facebook details like userName, email address, profile picture.
            self.loadFacebookUserDetails()


        })



    }

这是我在 loadFacebookUserDetails 中尝试过的。

func loadFacebookUserDetails()
    {
        MBProgressHUD.hideAllHUDs(for: self.view, animated: true)

        //Show Activity indicator
        let spiningActivity = MBProgressHUD.showAdded(to: self.view, animated: true)
        spiningActivity?.labelText = "Loading"
        spiningActivity?.detailsLabelText = "Wait"


        //Define fields we would like to read from Facebook User Object
        let requestParameters = ["fields": "id, email, first_name, last_name"]
        // me
        let userDetails : FBSDKGraphRequest = FBSDKGraphRequest(graphPath: "me", parameters: requestParameters)

        userDetails.start(completionHandler: { (connection, result, error) -> Void in

            if error != nil {


                print("in FBDetailed Error")
                //Display error message
                spiningActivity?.hide(true)

                let userMessage = error!.localizedDescription
                let myAlert = UIAlertController(title:"Alert", message: userMessage, preferredStyle: UIAlertControllerStyle.alert)

                let okAction = UIAlertAction(title: "Ok", style: UIAlertActionStyle.default, handler: nil)

                myAlert.addAction(okAction)

                self.present(myAlert, animated: true, completion: nil)

                PFUser.logOut()

                trở lại

            }

            var userId = String()
            var userName = String()
            var userEmail = String()
            var userFirstName = String()
            var userLastName = String()
            var displayName = String()

            var userObj = PFUser()

            //Extract user fields
            if let dict = result as? [String: AnyObject]
            {
                userId = dict["id"] as! String
                print("User id=\(userId)")
                userEmail = (dict["email"] as? String)!
                print("User email=\(userEmail)")

                userFirstName = dict["first_name"] as! String
                print("User FirstName=\(userFirstName)")
                userLastName = dict["last_name"] as! String
                print("User LastName=\(userLastName)")
            }

            //get Username
            if !userEmail.isEmpty
            {
                PFUser.current()?.email = userEmail
                if let range = userEmail.range(of: "@") {

                    let username = userEmail.substring(to: range.lowerBound)
                    userName = username

                    PFUser.current()?.username = username
                }
            }

            PFFacebookUtils.linkUser(inBackground: PFUser.current()!, with: FBSDKAccessToken.current())


            //Get Facebook profile picture
            let userProfile = "https://graph.facebook.com/" + userId + "/picture?type=large"

            let profilePictureUrl = URL(string:userProfile)
            let profilePictureData = try? Data(contentsOf: profilePictureUrl!)

            //Prepare PFUser object
            if(profilePictureData != nil)
            {
                let profileFileObject = PFFile(data:profilePictureData!)

                // userObj.setObject(profileFileObject!, forKey: "profileImg")

                if (PFUser.current()?.object(forKey: "profileImg")) == nil{

                    PFUser.current()?.setObject(profileFileObject!, forKey: "profileImg")
                }
            }

            displayName=userFirstName+userLastName
            PFUser.current()?.setObject(displayName, forKey: "displayname")



            //Check If user has already signedup or not
            let query = PFQuery(className: "_User")
            query.whereKey("username", equalTo: userName)
            try! userObj = query.getFirstObject() as! PFUser

// if userObj.username != nil {
//                
// print("already signed up")
// return
// }
// print(FBSDKAccessToken.current())



// try! PFUser.logIn(withUsername: userObj.username!, password: userObj.password!)

            PFFacebookUtils.linkUser(inBackground: PFUser.current()!, with: FBSDKAccessToken.current())


// userObj.setObject(displayName, forKey: "displayname")

            PFUser.current()?.saveInBackground(block: { (success:Bool, error:Error?) in
                spiningActivity?.hide(true)

                if(error != nil)
                {
                    let userMessage = error!.localizedDescription
                    let myAlert = UIAlertController(title: "Alert2", message: userMessage, preferredStyle: UIAlertControllerStyle.alert)

                    let okAction = UIAlertAction(title: "Ok", style: UIAlertActionStyle.default, handler: nil)

                    myAlert.addAction(okAction)

                    self.present(myAlert, animated: true, completion: nil)

                    PFUser.logOut()
                    trở lại
                }

                if(success)
                {
                    if !userId.isEmpty
                    {
                        print(userId)
                        //userId->userName
                        UserDefaults.standard.set(userName, forKey: "username")
                        UserDefaults.standard.synchronize()

                        DispatchQueue.main.async{
                            let appDelegate:AppDelegate = UIApplication.shared.delegate as! AppDelegate

                            appDelegate.buildUserInterface()
                        }

                    }

                }
            })
//



        })



    }

câu trả lời hay nhất

如果他不是 Facebook 链接帐户，您将需要 PFUser.current() 才能链接帐户。您的选择是:

1:) 使用您的逻辑通过登录页面登录 facebook。这意味着您在 Users 列中有一个新用户。因此，无论以后如何，基本上都可以用作 phân tích 登录。您可以只使用电子邮件或 Facebook 名称更新用户名(因为默认情况下，Facebook 登录将使用 NHẬN DẠNG 填充用户名)。一旦他进入成功页面，您可以让他填写一个密码，以备日后他选择不使用他的 facebook 帐户时使用。然后欢迎他使用取消链接按钮在设置页面中取消帐户链接。

@IBAction func unlinkFacebook(_ sender: AnyObject) {
    let user = PFUser.current()
    showHUD(message: "unlinking")
    PFFacebookUtils.unlinkUser(inBackground: user!, block:{
        (succeeded: Bool?, error) -> Void in
        if succeeded! {
            self.simpleAlert(mess: "Your account is no longer associated with your Facebook account.")
            self.hideHUD()

        }khác{
            self.simpleAlert(mess: "\(error!.localizedDescription)")
            self.hideHUD()
        }
    })
}

取消链接所做的只是清除 authData 列。

2:) 以 parse 用户身份登录，成功登录后要求他将他的帐户链接到 facebook。一个 chức năng 可能像:

func linkFacebook() {
   let user = PFUser.current()
    showHUD(message: "linking")
    if !PFFacebookUtils.isLinked(with: user!) {
        PFFacebookUtils.linkUser(inBackground: user!, withReadPermissions: nil, block:{
            (succeeded: Bool?, error) -> Void in
            if succeeded! {
             self.simpleAlert(mess: "Success. You can now log in using your facebook account in future.")
             self.hideHUD()
            }khác{
             self.simpleAlert(mess: "\(error!.localizedDescription)")
             self.hideHUD()
            }
        })
    }
}

可以将它放在您的 viewdidLoad 中，或者一个漂亮的按钮，让用户可以选择是否要链接他的帐户。请记住，如果您想存储 Facebook 详细信息，您将需要调用 Facebook sdk 来更新用户详细信息。

只有 Users 表 中填充的列是 authData。

关于swift - 如何通过 FacebookUtil 链接现有的 Parse 用户，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/41094001/