ios - PFFacebookUtils。如何区分登录和注册？

Question

我试图在使用 Parse.com 服务的应用程序中提供一些非常简单(正如我所想)的功能。我需要的只是允许用户通过 Facebook 创建帐户并通过 Facebook 再次登录。

问题是 PFFacebookUtils 登录方法不仅通过 Facebook 登录用户，而且还创建了一个新的 PFUser。为什么这对我来说是个问题？嗯，当然。我可以通过 isNew 字段区分注册和加入，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)，他登录后，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 ，这是在用户尝试登录时创建的。我看到用户不是新用户，它已经注册了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。

你明白问题所在了吗？我是白痴没有意识到如何处理 PFFFacebookUtils 帐户创建和登录，还是 PFFFacebookUtils 提供了一个白痴 API？你们是怎么做到的？您如何解决我所描述的问题。真的，它一定很简单，但我在任何地方都找不到好的例子

Answer 1

我在 swift 中有登录和注册代码，用于检查用户是否是登录和注册的新用户。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，然后在登录按钮中实现了一个名为“loadFacebookUserDetails”的函数

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()

            }

        })

    }

}

}

如果您在转换为 objective-c 时遇到问题，我打赌您可以找到有关如何执行此操作的 YouTube 视频。