Data not appearing in view controller - ios

Question

I have been trying everything I could but nothing seems to work. I am trying to pass firebase user information from one view controller to another, but it never appears.
It starts from a table view
The table view is populated with users that are being pulled from my firebase database. When the user selects a cell the following code gets executed:
I reference function "showProfileControllerForUser" as a way to transport the data of the cell that was selected
var mainProfile: userProfileNavigator?
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let user1 = self.users[indexPath.row]
self.mainProfile?.showProfileControllerForUser(user3: user1)
let storyboard: UIStoryboard = UIStoryboard(name: "Main", bundle:nil)
let vc: UINavigationController = storyboard.instantiateViewController(withIdentifier: "mainNavProfile") as! UINavigationController
self.present(vc, animated: true, completion: nil)
}
In "userProfileNavigator" is where the function that was used before is. The function passes the information that was collected and passes that to the final destination.
func showProfileControllerForUser(user3: User){
mainProfile?.user2 = user3
}
Finally, "mainProfile" is where I want the data to be passed to.
var user2: User?{
didSet{
navigationItem.title = user2?.name
}
I could imagine this being very confusing, I can provide anymore information or clarity if needed
attempted to setup table as such:
var mainProfile: mainProfile?
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let user1 = self.users[indexPath.row]
let storyboard: UIStoryboard = UIStoryboard(name: "Main", bundle:nil)
let vc: UIViewController = storyboard.instantiateViewController(withIdentifier: "mainProfile")
self.mainProfile?.user2 = user1
self.present(vc, animated: true, completion: nil)
}
And the ViewController in which the information is being passed as such:
import UIKit
import Firebase
class mainProfile: UIViewController{
#IBOutlet weak var testLabel: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
print("lets see if this is the new user", user2.name as Any)
}
var user2 = User()
}
but it still comes up as "nil"

Answer 1

If I understood your question right, then you have two ViewControllers. One which contain UITableView, and another is ShowProfileControllerForUser.
In ViewController which contain UITableView, code this:
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let user1 = self.users[indexPath.row]
let storyboard: UIStoryboard = UIStoryboard(name: "Main", bundle:nil)
let vc: UINavigationController = storyboard.instantiateViewController(withIdentifier: "mainNavProfile") as! UINavigationController
vc.user3 = user1
self.present(vc, animated: true, completion: nil)
}
Also, I am not sure if you're presenting the right ViewController.
In your ShowProfileControllerForUser.swift,
var user3 = User // declare a variable with proper type.
Now in your viewDidLoad():
override func viewDidLoad() {
super.viewDidLoad()
showProfileControllerForUser(user3)
}
Edit:
var mainProfile: mainProfile?
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let user1 = self.users[indexPath.row]
let storyboard: UIStoryboard = UIStoryboard(name: "Main", bundle:nil)
let vc: UIViewController = storyboard.instantiateViewController(withIdentifier: "mainProfile")
//self.mainProfile?.user2 = user1 // Instead of this line
vc.user2 = user1 // use this line
self.present(vc, animated: true, completion: nil)
}

Answer 2

If you want to open controller with that passed value, you can set that value after instantiating it
let storyboard: UIStoryboard = UIStoryboard(name: "Main", bundle:nil)
let vc: UINavigationController = storyboard.instantiateViewController(withIdentifier: "mainNavProfile") as! UINavigationController
// this is what your showProfileControllerForUser doing
vc.user2 = user1
self.present(vc, animated: true, completion: nil)