func not executed inside if statement swift - arrays

Question

im trying to fetch data from firestore for certain user and what i mean here is if there is a user his name is Mark and he logged in to his account i want to fetch MarkCollection from the Firestore so i decided to use if statement but it doesn't work . here in the first example i can fetch the data but i want this data to be displayed for the user Mark only and in the second Example i used if statement but the problem is loadData1() cannot execute inside if statement.
First Example:
import UIKit
import FirebaseFirestore
import Firebase
import FirebaseAuth
class orderTableViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, UITextFieldDelegate {
#IBOutlet var userName: UITextField!
var db: Firestore!
var phone = [String]()
var reciept = [String]()
var price = [String]()
var amount = [String]()
var Area = [String]()
override func viewDidLoad() {
super.viewDidLoad()
loadData1()
}
func loadData1() {
db.collection("markCollection").getDocuments() {
(querySnapshot, err) in
if let err = err
{
print("Error getting documents: \(err)");
}
else
{
for document in querySnapshot!.documents {
self.Area.append(document.get("area") as? String ?? "")
self.phone.append(document.get("phone") as? String ?? "")
self.reciept.append(document.get("reciept") as? String ?? "")
self.price.append(document.get("total price") as? String ?? "")
self.amount.append(document.get("amount") as? String ?? "")
}
}
self.order.reloadData()
}
}
}
and here is the problem when i use the if statement , the loadData1() func cannot execute
here is the code for Example 2:
import UIKit
import FirebaseFirestore
import Firebase
import FirebaseAuth
class orderTableViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, UITextFieldDelegate {
#IBOutlet var userName: UITextField!
var db: Firestore!
var phone = [String]()
var reciept = [String]()
var price = [String]()
var amount = [String]()
var Area = [String]()
override func viewDidLoad() {
super.viewDidLoad()
if userName.text == "Mark" {
loadData1()
}
}
func loadData1() {
db.collection("markCollection").getDocuments() {
(querySnapshot, err) in
if let err = err
{
print("Error getting documents: \(err)");
}
else
{
for document in querySnapshot!.documents {
self.Area.append(document.get("area") as? String ?? "")
self.phone.append(document.get("phone") as? String ?? "")
self.reciept.append(document.get("reciept") as? String ?? "")
self.price.append(document.get("total price") as? String ?? "")
self.amount.append(document.get("amount") as? String ?? "")
}
}
self.order.reloadData()
}
}
}
[1]
[1]: https://i.stack.imgur.com/5YONj.png

Answer 1

if you do not set a text "Mark" as a default text to the textField, it is nil at the moment that view cycle is in "ViewDidLoad". When a user enters something by using the keyboard, it happens in a different cycle.
You should check if userName.text == "Mark" when the user taps "done" button in the keyboard, or by checking in TextFields delegates while the user is typing.
to check the user input;
you can add this in viewDidLoad;
userName.addTarget(self, action: #selector(textFieldDidChange(_:)),
for: .editingChanged)
and then, in view controller;
#objc private func textFieldDidChange(_ textField: UITextField) {
print(textField.text) // so that you can see whether you can successfully connect the outlet. if nothing prints, it means that you could not connect it properly.
if textField.text = "Mark" {
loadData1()
}
}