如何將數據添加到Firebase數據庫中的特定使用引用？

Question

我目前的iOS需要用戶註冊並登錄，一旦用戶登錄，數據庫中的數據將以user.uid及其註冊的電子郵件地址顯示。一旦用戶登錄，我希望用戶能夠在其特定的user.uid節點上存儲數據。例如，如果「用戶A」登錄並且他們輸入某種類型的數據，我希望將數據保存在該用戶的下方（這樣每個用戶都應該包含自己的一組數據，並且不應該訪問或修改任何數據除此之外的其他用戶數據）。所以我的問題是，跟蹤登錄用戶或訪問登錄用戶將未來引用存儲在僅僅登錄控制器之外的後續視圖控制器中的最佳方式是什麼？這是一個食品交付應用程序，所以一旦用戶登錄，我希望所有未來輸入的數據都保存在該用戶的數據庫中。

代碼登錄控制器：

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/\(userID)").setValue(userEmail) 




     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() 

} 

如此反覆，一旦用戶登錄，我想輸入的所有數據略低於該登錄的用戶在下面的視圖控制器進行保存。例如，在下一個視圖控制器中，我有一個變量bookieAmount，我如何修改我的代碼，使每個登錄用戶都有一個單獨的節點，其中可以將其個人bookieAmount保存到哪裏？到目前爲止，當我嘗試實現這樣的功能時，它只是取代了以前的參考，並沒有像我想要的那樣爲特定用戶創建一個新的。

代碼爲下一個視圖控制器：

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

你可以做的就是讓到火力地堡服務器的請求，看看用戶是否仍然記錄在這段代碼

if Auth.auth().currentUser != nil { 
    // User is signed in. 
    let ref = Database.database().reference() 
    ref.child("users").child(user.uid).child("orders").setValue(["order": orderNumber]) 
} else { 
    // No user is signed in. 

}