PFFacebookUtils。如何区分登录和注册？

Posted 2023-03-11

【中文标题】PFFacebookUtils。如何区分登录和注册？

【英文标题】：PFFacebookUtils. How to make difference between login and signup?

【发布时间】：2016-03-27 11:11:46

【问题描述】：

我正在尝试在我的使用Parse.com 服务的应用程序中提供一些非常简单（如我所想）的功能。我需要的只是允许用户通过 Facebook 创建一个帐户并通过 Facebook 再次登录。

问题是PFFacebookUtils登录方法不仅通过Facebook登录用户，还创建了一个新的PFUser。为什么这对我来说是个问题？嗯，当然。我可以通过isNew 字段区分注册和登录，但这并没有真正的帮助。

考虑以下情况 - 用户尝试通过 Facebook 登录（他还没有PFUser），他登录，创建了一个新用户。我看到该用户是新用户（即该用户之前未注册），我必须拒绝此登录。好吧，我拒绝他，我说“你还没注册，去注册吧”。用户注册（通过相同的登录方法），这次返回相同的PFUser，这是用户尝试登录时创建的。我看到用户不是新用户，它已经注册，因此我必须再次拒绝该用户，因为该帐户已经存在并且不可能再次创建相同的帐户。

你明白这个问题吗？我是愚蠢的没有意识到如何处理PFFacebookUtils 帐户创建和登录，还是PFFacebookUtils 提供了一个愚蠢的API？你们是怎么做到的？你如何解决我描述的问题。真的，它一定很简单，但我在任何地方都找不到很好的例子

【参考方案1】：

我在 swift 中有登录和注册代码，用于检查用户是否是新用户登录和注册。这是我的代码：

登录

let spinningActivity = MBProgressHUD.showHUDAddedTo(self.view, animated: true)
    spinningActivity.label.text = "Just a Moment"
    spinningActivity.detailsLabel.text = "Logging in"

    if reachabilityStatus == kNOTREACHABLE 

        spinningActivity.hideAnimated(true)

        self.displayError("No Internet Connection", message: "Please connect to the internet before continuing")

     else 

        let permissions = ["public_profile"]

        PFFacebookUtils.logInInBackgroundWithReadPermissions(permissions)  (user:PFUser?, error:NSError?) -> Void in



            if error != nil 

                spinningActivity.hideAnimated(true)

                self.displayError("Error", message: error!.localizedDescription)

             else if let user = user 
                if user.isNew 

                    spinningActivity.hideAnimated(true)

                    PFUser.currentUser()?.deleteInBackground()

                    self.displayNoticeWithTwoActions("Account Not Found", message: "This Facebook account is not in our system. You have to sign up first.", firstButtonTitle: "Sign Up",closeButtonTitle: "Ok", segue: "dontHaveAccountSegue")

                 else 

                    spinningActivity.hideAnimated(true)

                    self.performSegueWithIdentifier("successfulLoginSegue", sender: self)



                
             else 

                PFUser.currentUser()?.deleteInBackground()

                spinningActivity.hideAnimated(true)

                self.displayError("Error", message: "Unless you tapped on 'Cancel' or 'Done', something went wrong. Please try again.")

            

        

    

注册

我有一个注册按钮，然后是一个在登录按钮中实现的功能，称为“loadFacebookUserDetails”

let spinningActivity = MBProgressHUD.showHUDAddedTo(self.view, animated: true)
    spinningActivity.label.text = "Just a Moment"
    spinningActivity.detailsLabel.text = "Loading Details"


    if reachabilityStatus == kNOTREACHABLE 

        spinningActivity.hideAnimated(true)

       self.displayError("No Internet Connection", message: "Please connect to the internet before continuing")

     else 

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

        PFFacebookUtils.logInInBackgroundWithReadPermissions(permissions)  (user:PFUser?, error:NSError?) -> Void in

            if let user = user 

                if !user.isNew 

                    spinningActivity.hideAnimated(true)

                    PFUser.logOut()


                    self.displayNoticeWithTwoActions("Account Found", message: "This Facebook account already in our system. You have to log in first.", firstButtonTitle: "Log In", closeButtonTitle: "Cancel", segue: "haveAccountSegue")



                 else if error != nil 

                    spinningActivity.hideAnimated(true)

                    self.displayError("Error", message: error!.localizedDescription)



                 else if error == nil 

                    spinningActivity.hideAnimated(true)

                    self.loadFacebookUserDetails()

                

            

       else 

                spinningActivity.hideAnimated(true)

                self.displayError("Something Went Wrong", message: "Unless you tapped on 'Cancel' or 'Done', something went wrong. Please try again")

            



        


    

---

func loadFacebookUserDetails() 

    let spinningActivity = MBProgressHUD.showHUDAddedTo(self.view, animated: true)
    spinningActivity.mode = MBProgressHUDMode.AnnularDeterminate
    spinningActivity.label.text = "Just a Moment"
    spinningActivity.detailsLabel.text = "Loading Details"

    let requestPerameters = ["fields": "id, email, first_name, last_name, name"]

    let userDetails = FBSDKGraphRequest(graphpath: "me", parameters: requestPerameters)

    userDetails.startWithCompletionHandler  (connection, result, error:NSError!) -> Void in

        if error != nil 

            spinningActivity.hideAnimated(true)

            self.displayError("Error", message: error!.localizedDescription)

            PFUser.logOut()

         else 

        let userID:String = result["id"] as! String
        let userEmail:String = result["email"] as! String
        let userFirstName:String = result["first_name"] as! String
        let userLastName:String = result["last_name"] as! String


        // Get Facebook Profile Picture

        let userProfile = "https://graph.facebook.com/" + userID + "/picture?type=large"

        let usernameLink = "https://graph.facebook.com/" + userID

        let username = usernameLink.stringByReplacingOccurrencesOfString("https://graph.facebook.com/", withString: "")

        let profilePictureUrl = NSURL(string: userProfile)

        let profilePictureData = NSData(contentsOfURL: profilePictureUrl!)

        if profilePictureData != nil 

            let profilePictureObject = PFFile(data: profilePictureData!)
            PFUser.currentUser()?.setObject(profilePictureObject!, forKey: "profile_picture")

        

        PFUser.currentUser()?.setObject(userFirstName, forKey: "first_name")
        PFUser.currentUser()?.setObject(userLastName, forKey: "last_name")
        PFUser.currentUser()?.setObject(username, forKey: "facebook_link")

        if userEmail == userEmail 

            PFUser.currentUser()?.email = userEmail

        

        PFUser.currentUser()?.saveInBackgroundWithBlock( (success:Bool, error:NSError?) -> Void in

            if error != nil 

                spinningActivity.hideAnimated(true)

                self.displayError("Error", message: error!.localizedDescription)

                PFUser.logOut()

             else if success == true 

                if !userID.isEmpty 

                    spinningActivity.hideAnimated(true)

                NSUserDefaults.standardUserDefaults().setObject("authData", forKey: "facebookAuth")

                    NSUserDefaults.standardUserDefaults().synchronize()

                    self.performSegueWithIdentifier("facebookUserDetailsSegue", sender: self)



                

             else 

                spinningActivity.hideAnimated(true)

                self.displayError("Something Went Wrong", message: "Please try again")

                PFUser.logOut()

            

        )

    

如果您在转换到目标 c 时遇到问题，我敢打赌，您可以在 YouTube 上找到有关如何执行此操作的视频。