如何通过传递Firebase参考来跟踪用户？

Question

因此，我正在构建一个iOS应用程序，它需要用户注册并登录。登录视图控制器在用户输入数据后会跳转到表视图控制器。在用户确认他们输入的数据信息之后，它会转到一个送货信息视图控制器，在那里他们输入送货地址信息。我的问题是，如何才能将其输入到用户输入的数据以及他们输入的送货地址信息是否保持对特定用户的引用？这样，如果其他用户登录，他们的数据量和送货地址信息会存储在其自己的节点下，并与其他用户分离？试想像任何食品派送应用程序，我很想知道他们如何跟踪每个用户的订单，送货地址等附加到该特定用户？现在，每当我尝试使用不同的用户进行新的引用时，它都会替换旧的引用，即使它是由其他用户存储的。

import UIKit 
import FirebaseDatabase 
import FirebaseAuth 

class LogInController: UIViewController { 

var ref: DatabaseReference! 


@IBOutlet weak var emailField: UITextField! 
@IBOutlet weak var passwordField: UITextField! 


func placeholders() { 
    emailField.placeholder = "Enter Email" 
    passwordField.placeholder = "Enter Password" 
} 






@IBAction func loginButton(_ sender: AnyObject) { 

    Auth.auth().signIn(withEmail: emailField.text!, password: passwordField.text!, completion: { (user, error) in 




     let userID: String = (user?.uid)! 
     let userEmail: String = self.emailField.text! 

     self.ref.child("Users").childByAutoId().setValue(userEmail + " " + userID) 




     if error != nil { 
      print(error?.localizedDescription as Any) 
     } 

     else { 
      print("User logged in with UserID of: " + (user?.uid)!) 
     } 
     }) 
    performSegue(withIdentifier: "signedIn", sender: self) 


} 



@IBAction func signoutButton(_ sender: Any) { 
    print("User has logged out...") 
    try! Auth.auth().signOut() 
} 



@IBAction func registerButton(_ sender: AnyObject) { 

    Auth.auth().createUser(withEmail: emailField.text!, password: passwordField.text!, completion: { (user, error) in 

     if error != nil { 
      print(error?.localizedDescription as Any) 
      return 
     } 

      print("User created with UserId of: " + (user?.uid)!) 


    }) 
} 



override func prepare(for segue: UIStoryboardSegue, sender: Any?) { 
    if let flavorsVC = segue.destination as? FlavorsController { 
     flavorsVC.ref = ref 
     let userEmail = emailField.text 
     flavorsVC.email = userEmail! 

    } 
} 







override func viewDidLoad() { 
    super.viewDidLoad() 


    placeholders() 
    ref = Database.database().reference() 

} 

查看我试图将数据保存在控制器：

import UIKit 
import FirebaseAuth 
import Firebase 
import FirebaseDatabase 

class FlavorsController: UIViewController, UITableViewDelegate, UITableViewDataSource { 

var bookieFlavors = ["Chocolate Chip", "Sugar w/o icing", "Sugar w/ icing", "Peanut Butter", "Honey", "Shortbread", "Ginger", "Double Chocolate", "Macadamie Nut", "Oatmeal Raisin", "Snickerdoodle"] 
var amount = [Int]() 
var bookieTotal = Int() 
var ref: DatabaseReference! 
var flavorRef: DatabaseReference! 
var email = String() 





override func viewDidLoad() { 
    super.viewDidLoad() 
    for _ in self.bookieFlavors { 
     self.amount.append(0) 
    } 
    flavorTable.delegate = self 
    flavorTable.dataSource = self 

    //database references 
    ref = Database.database().reference() 
    flavorRef = Database.database().reference() 



} 

func emptyAmount(_ sender: UIButton) { 
    print("Button Held, Amount Emptied") 
    self.amount[sender.tag] = self.amount[sender.tag] - (self.amount[sender.tag] + 1) 
    let cell = self.flavorTable.cellForRow(at: IndexPath(row: sender.tag, section: 0)) as? FlavorTableCell 
    cell?.bookieAmount.text = "= \(self.amount[sender.tag])" 

} 


@IBAction func bookieButton(_ sender: UIButton) { 

    self.amount[sender.tag] = self.amount[sender.tag] + 1 
    let cell = self.flavorTable.cellForRow(at: IndexPath(row: sender.tag, section: 0)) as? FlavorTableCell 
    cell?.bookieAmount.text = "= \(self.amount[sender.tag])" 
    // print(amount[sender.tag]) 

    self.bookieTotal = amount.reduce(0, +) 
    print(bookieTotal) 
} 




@IBOutlet weak var flavorTable: UITableView! 


func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int  
{ 
    return bookieFlavors.count 

} 

func numberOfSections(in tableView: UITableView) -> Int { 
    return 1 
} 

public func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell 
{ 
    let cell = tableView.dequeueReusableCell(withIdentifier: "cell") as! FlavorTableCell 


    //flavor label configuration 
    cell.flavorLabel.text = bookieFlavors[indexPath.row] 

    //amount configuration 
    cell.bookieAmount.text = "= \(self.amount[indexPath.row])" 
    cell.bookieButton.tag = indexPath.row 
    cell.bookieButton.addTarget(self, action: #selector(bookieButton(_:)), for: .touchUpInside) 
    cell.bookieButton.addTarget(self, action: #selector(emptyAmount(_:)), for: .touchDownRepeat) 

    return cell 

} 

@IBAction func registerBookieAmount(_ sender: Any) { 
    print(bookieTotal) 

    let amount: Int = bookieTotal 
    let user = Auth.auth().currentUser 

    if ((user) != nil) { 


    } 
} 

Answer 1

现在，这是一个有点困难不知道你的数据结构，但它看起来像每一次，新用户登录节点使用这个代码在这里为他们创造：

self.ref.child("Users").childByAutoId().setValue(userEmail + " " + userID)

而不是使用childByAutoId()，它创建了一个独特的推ID的，让userID关键：

self.ref.child("Users/\(userID)").setValue(["email": userEmail])

然后你就可以听的ref.child("Users/\(userID)")值来获得用户的保存的数据。您还可以将任何数据写入相同的路径，例如您提到的送货地址。

顺便说一句，我建议你打电话self.ref.child("Users/\(userID)").setValue(["email": userEmail])内createUser(withEmail: email, password: password)，因为这个节点不需要每次都重写用户登录。