Question

我的应用程序允许Facebook身份验证。当用户登录时，我想建立一个名为users的节点，其中包含一些用户信息。具体来说，我想从Facebook获取用户的UID，名称和个人资料图片。

到目前为止，这是我的代码：

    let credential = FIRFacebookAuthProvider.credential(withAccessToken: FBSDKAccessToken.current().tokenString)

    // using the credentials above, sign in to firebase to create a user session
    FIRAuth.auth()?.signIn(with: credential) { (user, error) in
        print("User logged in the firebase")

        // adding a reference to our firebase database
        let ref = FIRDatabase.database().reference(fromURL: "https://gsignme-14416.firebaseio.com/")

        // guard for user id
        guard let uid = user?.uid else {
            return
        }

        // create a child reference - uid will let us wrap each users data in a unique user id for later reference
        let usersReference = ref.child("users").child(uid)

        // performing the Facebook graph request to get the user data that just logged in so we can assign this stuff to our Firebase database:


        let graphRequest = FBSDKGraphRequest(graphPath: "me", parameters: nil).start{
            (connection, result, err) in


            if let user = FIRAuth.auth()?.currentUser{
                let name = user.displayName! as String


                let newImage = UIGraphicsGetImageFromCurrentImageContext()
                let data: Data = UIImageJPEGRepresentation(newImage!, 0.5)!
                let storage = FIRStorage.storage()
                let storageRef = storage.reference(forURL: "gs://gsignme-14416.appspot.com")
                let profilePicRef = storageRef.child(user.uid+"/profile_pic.jpg")


                let metadata = FIRStorageMetadata()
                metadata.contentType = "image/jpg"

                // Upload the file
                let uploadTask = profilePicRef.put(data, metadata: metadata) { metadata, error in
                    if (error == nil) {

                        self.downloadurl = metadata!.downloadURL()!.absoluteString

                    } else {

                        print("there was an error uploading the profile pic!")


                    }


                let postObject: Dictionary<String, Any> = [
                    "uid": uid,
                    "username" : name,
                    "userpic" : self.downloadurl


                ]



            if ((error) != nil) {
                // Process error
                print("Error: \(String(describing: error))")
            } else {
                print("fetched user: \(String(describing: result))")

                let values: [String:AnyObject] = result as! [String : AnyObject]

                // update our database by using the child database reference above called usersReference
                usersReference.updateChildValues(postObject, withCompletionBlock: { (err, ref) in
                    // if there's an error in saving to our firebase database
                    if err != nil {
                        print(err!)
                        return
                    }
                    // no error, so it means we've saved the user into our firebase database successfully
                    print("Save the user successfully into Firebase database")
                })
            }
                }}}


    }

如果没有实现从firebase存储中检索用户的照片URL，则可以通过输出名称和UID来完美地工作。但是，当我尝试从firebase存储中检索图像URL时，它会崩溃并且没有任何输出。我不确定我做错了什么。

我希望数据库看起来像这样：

Answer 1

以下是如何在数据库中存储和更新图像链接以及如何从链接中检索图像的过程。

更新数据库中的数据。

 //// **NOTE:** store user ID globally in user auth so that you use userID here
func updateUserData(){
        let dbstrPath : String! = "\(userid)"// where you wanted to store Db.

        // Create dict as your DB.   
        let aDictUpdateValues = ["userName"       : "John",
                                 "userEmail"      : "john@gmail.com",
                                 "userPic"        : "",
                                 "uid"            : userid] 
        // The Db is created as per your dict and file path. So create this two things specifically according to you..
        dbRef!.child(dbstrPath).updateChildValues(aDictUpdateValues, withCompletionBlock: { (error, ref) in

            if error == nil{
                print("updated successfully")
                self.uploadProfilePic()
                dbRef.child(dbstrPath).setValue(aDictUpdateValues)

                let aData = NSKeyedArchiver.archivedData(withRootObject: auserDetail)
                print(ref)
            }
            else{
                print("error in updation")
                print(error!)
            }
        })
    }

//在存储中上传图片

 func uploadProfilePic(){
        var data = NSData()
        data = UIImageJPEGRepresentation(ivProfile.image!, 0.8)! as NSData
        // set upload path
        let filePath = "\(userid)" // path where you wanted to store img in storage
        let metaData = FIRStorageMetadata()
        metaData.contentType = "image/jpg"

        self.storageRef = FIRStorage.storage().reference()
        self.storageRef.child(filePath).put(data as Data, metadata: metaData){(metaData,error) in
            if let error = error {
                print(error.localizedDescription)
                return
            }else{// store imageURL in DB.
                let dbfilePath = "\(userid)/userpic" // update db userpic link.
                //store downloadURL
                let downloadURL = metaData!.downloadURL()!.absoluteString
                //store downloadURL at database
                dbRef.child(dbfilePath).updateChildValues(["userPic" : downloadURL])
            }
        }

    }

从firebase存储中获取图像。

 func getProfileImage(){
          let dbstrPath : String! = "your_db_path" // path where link is stored in  DB.
        dbRef.child(dbstrPath).observeSingleEvent(of: .value, with: { (snapshot) in

          // get dict of value from db.
            if let aDictValue = snapshot.value! as? [String : Any] {

                // call storage ref from link
                 self.storageRef =  FIRStorage.storage().reference(forURL: aDictValue[Constant.FireBaseDBKey.kuserProfilePic]! as! String)
                // Assuming your image size < 10MB.
                self.storageRef.data(withMaxSize: 10*1024*1024, completion: { (data, error) in
                    if data != nil{ // if image found 
                        let userPhoto = UIImage(data: data!)
                        self.ivProfile.image = userPhoto
                    }
                    else{ // if img not found set default image.
                        self.ivProfile.image = UIImage(named: "profile")
                    }
                })
            }
        })
    }

从firebase存储中检索图像URL到数据库

1 个答案: