如何将数据添加到Firebase数据库中的特定使用引用？

Question

我目前的iOS需要用户注册并登录，一旦用户登录，数据库中的数据将以user.uid及其注册的电子邮件地址显示。一旦用户登录，我希望用户能够在其特定的user.uid节点上存储数据。例如，如果“用户A”登录并且他们输入某种类型的数据，我希望将数据保存在该用户的下方（这样每个用户都应该包含自己的一组数据，并且不应该访问或修改任何数据除此之外的其他用户数据）。所以我的问题是，跟踪登录用户或访问登录用户将未来引用存储在仅仅登录控制器之外的后续视图控制器中的最佳方式是什么？这是一个食品交付应用程序，所以一旦用户登录，我希望所有未来输入的数据都保存在该用户的数据库中。

代码登录控制器：

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() 

} 

如此反复，一旦用户登录，我想输入的所有数据略低于该登录的用户在下面的视图控制器进行保存。例如，在下一个视图控制器中，我有一个变量bookieAmount，我如何修改我的代码，使每个登录用户都有一个单独的节点，其中可以将其个人bookieAmount保存到哪里？到目前为止，当我尝试实现这样的功能时，它只是取代了以前的参考，并没有像我想要的那样为特定用户创建一个新的。

代码为下一个视图控制器：

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

你可以做的就是让到火力地堡服务器的请求，看看用户是否仍然记录在这段代码

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. 

}