从 Firestore Swift 获取每个用户的文档

Question

Im trying to get document for each user login to his account, i have two collections in Firestore one called ( firstName ) and the second one called ( lastName ) and i want from user 1 to get ( firstName ) collection only and user number 2 to get ( lastName ) collection only.

i tried with if statement but it doesn't work with me.

import UIKit
import FirebaseFirestore
import Firebase
import FirebaseAuth

class namesTableViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, UITextFieldDelegate {

@IBOutlet var names: UITableView!
var db: Firestore!
var firstName = [String]()
var lastName = [String]()


override func viewDidLoad() {
    super.viewDidLoad()
    
    
    names.register(UINib(nibName: "Order1TableViewCell", bundle: nil) , forCellReuseIdentifier: "order")
    
    names.dataSource = self
    names.delegate = self
    
    db = Firestore.firestore()

   

let storyboard = UIStoryboard(name: "Main", bundle: nil)
    guard let viewController1 = storyboard.instantiateViewController(withIdentifier: "login") as? logInViewController else{return}        
   viewController1.userNameField?.delegate = self

 
    if viewController1.userNameField?.text == “1@1.com" {
     loadData1()
    }

    if viewController1.userNameField?.text == “2@2.com” {
     loadData2()
    }
    
       

func loadData1() {
    db.collection("firstName").getDocuments()
    {
        (querySnapshot, err) in
        
        if let err = err
        {
            print("Error getting documents: \(err)");
        }
        else
        {
            for document in querySnapshot!.documents {
                
                self.firstName.append(document.get("firstname") as? String ?? "")
                self.lastName.append(document.get("lastname") as? String ?? "")
            }
        }
        self.names.reloadData()
    }
}




func loadData2() {
    db.collection("lastName").getDocuments()
    {
        (querySnapshot, err) in
        
        if let err = err
        {
            print("Error getting documents: \(err)");
        }
        else
        {
            
            for document in querySnapshot!.documents {
                self.firstName.append(document.get("firstname") as? String ?? "")
                self.lastName.append(document.get("lastname") as? String ?? "")
            }
        }
        self.names.reloadData()
    }
}
}

this is logInViewController code

import UIKit
import Firebase
import FirebaseAuth

class logInViewController: UIViewController, UITextFieldDelegate {

@IBOutlet var userNameField: UITextField!
@IBOutlet var passwordField: UITextField!
@IBOutlet var logInButton: UIButton!


override func viewDidLoad() {
    
    logInButton.layer.cornerRadius = 4.0
    super.viewDidLoad()
    
    userNameField.delegate = self
    passwordField.delegate = self

    // Do any additional setup after loading the view.
}


@IBAction func logInButtonClicked(_ sender: Any) {
    
    Auth.auth().signIn(withEmail: (userNameField.text ?? ""), password: (passwordField.text ?? "")) { (result, error) in
              if let _eror = error{
                let alert = UIAlertController(title: "Error", message: error!.localizedDescription, preferredStyle: .alert)
                               let okAction = UIAlertAction(title: "Ok", style: .default, handler: nil)
                               alert.addAction(okAction)
                               self.present(alert,animated: true)
                  print(_eror.localizedDescription)
              }else{
                  if let _res = result{
                      print(_res)
                  }
                
                
               
                
        
                
                let VC1 = self.storyboard!.instantiateViewController(withIdentifier: "order1") as! namesTableViewController
                self.navigationController!.pushViewController(VC1, animated: true)
                
                
                
                
              }
          }
 }


}

this is fire store structure image

Answer 1

Be careful by doing let view1 = firstViewController() you are not grabbing the correct instance of firstViewController but one you just created. User.text therefore won't be set. You need to grab the right instance of it, if you are using storyboard you can do:

let storyboard = UIStoryboard(name: "nameofstoryboard", bundle: nil)
guard let viewController1 = storyboard.instantiateViewController(withIdentifier: "myIdentifier") as? firstViewController else{return} //set VC Identifier in Storyboard identity inspector

Then you can check the User property with if-statement