Hello,I'm learning CoreData but my Tutorial is about one year old so not everything is up to date and I don't understand where the problem is. My Project includes an TableViewController with an bar button item. Here is the codeCoreDataResource.swift:import UIKit import CoreData class CoreDataResource { // /Document var documentDir : URL { let allUrls = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask) return allUrls[0] } let appDelegate = UIApplication.shared.delegate as! AppDelegate private var managedObjectModel: NSManagedObjectModel { guard let url = Bundle.main.url(forResource: "Listen", withExtension: "momd") else { fatalError("fix me: not found?") } guard let model = NSManagedObjectModel(contentsOf: url) else { fatalError("error in the model?") } return model } private var storeCoordinator: NSPersistentStoreCoordinator { let coordinator = NSPersistentStoreCoordinator(managedObjectModel: self.managedObjectModel) let url = self.documentDir.appendingPathComponent("Listen.sqlite") do { try coordinator.addPersistentStore(ofType: NSSQLiteStoreType, configurationName: nil, at: url, options: nil) } catch { print(error) } return coordinator } var managedContext: NSManagedObjectContext { let context = NSManagedObjectContext(concurrencyType: .mainQueueConcurrencyType) context.persistentStoreCoordinator = self.storeCoordinator return context } func saveContext() { if managedContext.hasChanges { do { try managedContext.save() } catch { print(error) } } } func loadLists() -> [Liste] { let request: NSFetchRequest = Liste.fetchRequest() var listen = [Liste]() do{ listen = try managedContext.fetch(request) } catch { print(error) } return listen } func newList(_ name: String) { let newList = NSEntityDescription.insertNewObject(forEntityName: "Liste", into: managedContext) as! Liste newList.name = name saveContext() } }ListTableViewController.swift:import UIKit class ListTableViewController: UITableViewController { let appDelegate = UIApplication.shared.delegate as! AppDelegate var listen = [Liste]() override func viewDidLoad() { super.viewDidLoad() reloadList() } private func reloadList() { listen = appDelegate.coreDataResource.loadLists() } @IBAction func addDummyData(_ sender: Any) { appDelegate.coreDataResource.newList("Test entry") appDelegate.coreDataResource.saveContext() reloadList() } // MARK: - Table view data source override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell { let cell = tableView.dequeueReusableCell(withIdentifier: "listCell", for: indexPath) let liste = listen[indexPath.row] cell.textLabel?.text = liste.name return cell } override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int { // #warning Incomplete implementation, return the number of rows return listen.count } }If I press in Simulator on the addDummyData button the following error occurs:CoreData: error: Mutating a managed object 0x6000026b25c0 <x-coredata:///Liste/t8A4529E8-BD3B-4157-B3AF-E8B011B6C46E2> (0x6000005b6300) after it has been removed from its context.I can't find the mistake. Please help me it's frustrating 😀

Hey,I'm a beginner hobby dev who tried cloud storage for first time using SwiftUI.I wanted to make a simple app which only needs to retrieve some values of a Database.I'm using Firebase RealTime Database.My Database structure looks like this:monsterhunter-e8167 Velkhana HP: 12000element: IceRath HP: 8000element: FireMy Code looks like this:import SwiftUI import FirebaseDatabase struct ContentView: View { var ref: DatabaseReference = Database.database().reference() var body: some View { Button(action: { self.ref.child("monsterhunter-e8167").child("Velkhana") .observeSingleEvent(of: .value, with: { (snapshot) in let value = snapshot.value as? NSDictionary let hp = value?["HP"] as? Int ?? 0 print(hp) // ... }) { (error) in print(error.localizedDescription) } }) { Text("print") } } } struct ContentView_Previews: PreviewProvider { static var previews: some View { ContentView() } }However it is printing out0the expected output should be:12000I figured out "value" is nil but I don't know why."childpath" should be correctCan anyone tell me what I'm doing wrong?

I'm new to swiftUI.There must be a way to make this better.For example if I add an Item (for example: "name5") to names I have to add a new HStack Block in my Code.How can I do this more efficient?import SwiftUI struct name: View { let names = ["name1", "name2", "name3", "name4"] var body: some View { List { VStack { HStack { Image(names[0]) Text(names[0]) } HStack { Image(names[1]) Text(names[1]) } HStack { Image(names[2]) Text(names[2]) } HStack { Image(names[3]) Text(names[3]) } } } } } struct monsterList_Previews: PreviewProvider { static var previews: some View { name() } }Maybe something like this.Pseudocode: foreach i in names.count: HStack { Image(names[i]) Text(names[i]) }if I add an Item to names it should automatically increase the list by the new element.thanks in advance

I'm new to SwiftUI and tried my first project on it.So I want to make an iOS app which is showing some data from Firestore in a list. The list is empty because MonsterT is empty. How can I call the init of Class MonsterC?In my SceneDelegate I added following line in func scene and added this variable:class SceneDelegate: UIResponder, UIWindowSceneDelegate { var window: UIWindow? var monsterT = MonsterC() func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionIf using a storyboard, the `window` property will automatically be initialized and attached to the scene. // This delegate does not imply the connecting scene or session are new (see `application:configurationForConnectingSceneSession` instead). // Create the SwiftUI view that provides the window contents. let contentView = ContentView().environmentObject(monsterT) // Use a UIHostingController as window root view controller. if let windowScene = scene as? UIWindowScene { let window = UIWindow(windowScene: windowScene) window.rootViewController = UIHostingController(rootView: contentView) self.window = window window.makeKeyAndVisible() } }...My Listimport SwiftUI struct ContentView: View { @EnvironmentObject var monsterT: MonsterC var body: some View { List(monsterT.monsters, id: \.self) { monster in Text(monster.name) } } }My MonsterC Class with MonsterObjimport SwiftUI import FirebaseFirestore import FirebaseFirestoreSwift struct MonsterObj: Identifiable, Equatable, Hashable { var id = UUID() var name: String var element: String var immune: String var size: String var twoStarWeakness: String var threeStarWeakness: String #if DEBUG static let exampleMonster = MonsterObj(id: UUID(), name: "Test Monster", element: "Test Element", immun: "Test immune", groesse: "Test size", twoStarWeakness: "Test 2 Weakness", threeStarWeakness: "Test3 Weakness") #endif } class MonsterC: ObservableObject { var db = Firestore.firestore() @Published var monsters = [MonsterObj]() init() { var monsterCount: [String] = [""] monsterCount.remove(at: 0) db.collection("Monster").getDocuments() { (querySnapshot, err) in if let err = err { print(err) } else { for document in querySnapshot!.documents { monsterCount.append(document.documentID) } } } for monsterName in monsterCount { print(monsterName) db.collection("Monster").document(monsterName).getDocument { (document, error) in if let document = document, document.exists { let elementGetter = document.get("element") as! String let immuneGetter = document.get("immune") as! String let sizeGetter = document.get("size") as! String let twoStarWeaknessGetter = document.get("2 Star Weakness") as! String let threeStarWeaknessGetter = document.get("3 Star Weakness")as! String self.monsters.append(MonsterObj.init(name: monsterName, element: elementGetter, immune: immuneGetter, size: sizeGetter, twoStarWeakness: twoStarWeaknessGetter, threeStarWeakness: threeStarWeaknessGetter)) } } } }What am I doing wrong or missing?Thanks in advance 🙂

My listView is simplestruct ListView: View { var body: some View { NavigationView { List(myList) { element in NavigationLink(destination: NextView()) { Text(element.name) } } } } }Thought I could set a background Image for the whole View with.background(Image("ImageName"))modifier. But the lists background is still white. I don't want to set an image for each row only once for the whole view.Can anyone help?