我正在尝试在我的应用程序中提供一些非常简单（我认为）的功能，该应用程序使用Parse.com服务。我需要的是让用户通过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，还创建了新的PFUser。为什么这对我来说是一个问题？嗯，当然。我可以区分注册和isNew字段，但它并没有真正帮助。
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。我看到用户是新的（即用户之前没有注册），我必须拒绝此登录。好吧，我拒绝他，我说“你还没有登记，去报名”。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。我看到用户不是新的，它已经注册，因此我必须再次拒绝用户，因为该帐户已存在且无法再次创建同一帐户。
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，或者PFFacebookUtils谁提供了一个愚蠢的API？你们这样做的人怎么样？你如何解决我所描述的问题。真的，它必须如此简单，但我无法在任何地方找到一个好的例子
答案 0 :(得分：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：
<强> LOGIN
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.")
}
}
}
<强> SIGNUP
我有一个注册按钮，然后在登录按钮中实现了一个名为＆＃34; loadFacebookUserDetails＆＃34;
的功能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()
}
})
}
}
}
如果您在转换为目标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。