How to pass Item from initial (one time) first time view controller to main view controller and save that data using core data - ios

Question

I have been working on this issue for two days now and sadly I cannot figure out the issue to my problem. I'm trying to take one item from my initial one time view controller and send that to my main view controller where it will be saved within the main view controller and will appear upon that controller when reloading the app.
Here is my app delegate code for the "first time" view controller
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
if UserDefaults.standard.bool(forKey: "firstTimer") {
let storyBoard = UIStoryboard.init(name: "Main", bundle: nil)
let mainView = storyBoard.instantiateViewController(withIdentifier: "MainViewControllerID")
let nav = UINavigationController(rootViewController: mainView)
nav.navigationBar.isHidden = true
self.window?.rootViewController = nav
}
return true
}
containers and saveContext are default
import UIKit
import CoreData
class FirstTimeViewController: UIViewController {
let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
private var appDelegate = UIApplication.shared.delegate as! AppDelegate
private var player = [Player]()
#IBOutlet weak var nameTextField: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
// This View Controller will only be used once upon the first time the app is being used.
// MARK: Make func that prepares for segue on initial opening of app
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "toMainViewController" {
let mainViewController = segue.destination as! UINavigationController
let destination = mainViewController.topViewController as! MainViewController
if let newPlayer = self.nameTextField.text{
destination.name.name = newPlayer
destination.playerData.name = newPlayer
saveItems()
}
}
}
#IBAction func continueButtonPressed(_ sender: UIStoryboardSegue) {
UserDefaults.standard.set(true, forKey: "firstTimer")
let mainPlayer = PlayerData()
let player1 = Player(entity: Player.entity(), insertInto: context)
player1.name = mainPlayer.name
performSegue(withIdentifier: "toMainViewController", sender: self)
saveItems()
}
func saveItems() {
do {
try context.save()
print("File Successfully saved!")
}catch {
print("Error saving Context \(error)")
}
}
// MARK: Function to Save and Load data??
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
// Get the new view controller using segue.destination.
// Pass the selected object to the new view controller.
}
*/
func loadItems() {
let request = Player.fetchRequest() as NSFetchRequest<Player>
do {
player = try context.fetch(request)
print("Info loaded")
} catch {
print("Error fetching data from context \(error)")
}
}
}
MainViewController being sent the information. I only want to send one item and save it to that main view controller.
import UIKit
import Foundation
import CoreData
class MainViewController: UIViewController {
//set up model object, buttons, and labels
// let player: Player!
let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
private var appDelegate = UIApplication.shared.delegate as! AppDelegate
// lazy var nameText = Player(context: context)
// var playerInfo = [Player]()
lazy var player = [Player]()
let playerData = PlayerData()
var name = ""
#IBOutlet weak var playerName: UILabel!
#IBOutlet weak var currentLevel: UILabel!
#IBOutlet weak var xpCounter: UILabel!
#IBOutlet weak var playerProfileImage: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
// loadItems()
// name = playerData.name
if let nameOfPlayer = name.name {
print("This is what we see: \(nameOfPlayer)")
playerName.text = nameOfPlayer
}
appDelegate.saveContext()
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
// loadView()
}
#IBAction func menuButtonPressed(_ sender: Any) {
}
func loadItems() {
let request = Player.fetchRequest() as NSFetchRequest<Player>
do {
player = try context.fetch(request)
print("Info loaded")
} catch {
print("Error fetching data from context \(error)")
}
}
// MARK : Add Name to Main View
// MARK : Add Xp To Main View
// MARK : Add UI Image to profile image view
// MARK: (Optional) Create a 'Choose a task button to segue to the task tab'
// MARK: Program the Progress Bar to update on xp gained and reset on level up
// MARK: Function to Save and Load data??
}
If dataSource code needed I will add upon request.
Thanks!

Answer 1

Code is wrong. You should do more check

Answer 2

This is what I was able to achieve:
import UIKit
import CoreData
class FirstTimeViewController: UIViewController {
private var player = [Player]()
private var appDelegate = UIApplication.shared.delegate as! AppDelegate
private let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
#IBOutlet weak var nameTextField: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
// This View Controller will only be used once upon the first time the app is being used.
// MARK: Make func that prepares for segue on initial opening of app
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "toMainViewController" {
let entity = NSEntityDescription.entity(forEntityName: "Player", in: context)
let newPlayer = NSManagedObject(entity: entity!, insertInto: context)
if let newUser = self.nameTextField.text{
newPlayer.setValue(newUser, forKey: "name")
print("This is what i got: ", newPlayer)
}
appDelegate.saveContext()
}
}
#IBAction func continueButtonPressed(_ sender: UIStoryboardSegue) {
UserDefaults.standard.set(true, forKey: "firstTimer")
performSegue(withIdentifier: "toMainViewController", sender: self)
}
And for the Main View Controller:
import UIKit
import Foundation
import CoreData
class MainViewController: UIViewController {
//set up model object, buttons, and labels
let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
private var appDelegate = UIApplication.shared.delegate as! AppDelegate
lazy var player = [Player]()
#IBOutlet weak var playerName: UILabel!
#IBOutlet weak var currentLevel: UILabel!
#IBOutlet weak var xpCounter: UILabel!
#IBOutlet weak var playerProfileImage: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
let request = NSFetchRequest<NSFetchRequestResult>(entityName: "Player")
// request.predicate = NSPredicate(format: "name = %#", "noon")
request.returnsObjectsAsFaults = false
do {
let result = try context.fetch(request)
for data in result as! [NSManagedObject] {
print(data.value(forKey: "name") as! String)
self.playerName.text = data.value(forKey: "name") as? String
}
} catch {
print("Failed")
}
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
// loadView()
}
#IBAction func menuButtonPressed(_ sender: Any) {
}