Edit operation is not working in Core Data - ios

Question

I'm working on core data crud operation.I've Person object and when user click on add (+) button user can add the person name and person name will show in tableview. When user click on any tableView cell it shows the alert and current tap cell person show in alert text field and user can edit the name of person but my logic is not working fine and user is not editing.I've one more problem like when i run the app the pervious users record not showing but it will showing after I will enter the new user and fetch all the pervious users see the code and guide me thanks in advance.
ViewController Class:
#IBOutlet weak var tableView: UITableView!
let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
var items : [Person] = [] {
didSet{
DispatchQueue.main.async {
self.tableView.reloadData()
}
}
}
override func viewDidLoad() {
super.viewDidLoad()
self.tableView.delegate = self
self.tableView.dataSource = self
tableView.register(UINib(nibName: String(describing: StundentCell.self), bundle: .main), forCellReuseIdentifier: String(describing: StundentCell.self))
}
#IBAction func addPerson(_ sender: UIBarButtonItem) {
showAlert()
}
private func showAlert(_ title:String = "Add new Item", message: String = "what is your name"){
let alertController = UIAlertController(title: title, message: message, preferredStyle: .alert)
alertController.addTextField()
let subbmitBtn = UIAlertAction(title: "Add Person", style: .default) { (action) in
let textField = alertController.textFields![0]
let newPerson = Person(context:self.context)
newPerson.name = textField.text
newPerson.age = 20
newPerson.gender = "Male"
do {
try self.context.save()
}
catch{
}
self.fetchPerople()
}
alertController.addAction(subbmitBtn)
self.present(alertController, animated: true, completion: nil)
}
func fetchPerople(){
do{
self.items = try context.fetch(Person.fetchRequest())
}
catch{
}
}
}
extension ViewController: UITableViewDelegate,UITableViewDataSource{
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return items.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
self.configurePersonCell(tableView, cellForRowAt: indexPath)
}
func configurePersonCell(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell{
guard let cell = tableView.dequeueReusableCell(withIdentifier: String(describing: StundentCell.self)) as? StundentCell else {return UITableViewCell()}
cell.studentData = items[indexPath.row]
cell.delete.tag = indexPath.row
cell.delete.addTarget(self, action: #selector(deleteRecord(sender:)), for: .touchUpInside)
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
var person = items[indexPath.row].name
let alertController = UIAlertController(title: "Edit Person", message: "Edit name", preferredStyle: .alert)
alertController.addTextField()
let alertField = alertController.textFields![0]
alertField.text = person
let saveBtn = UIAlertAction(title: "Save", style: .default) { (action) in
let getName = alertController.textFields![0]
person = getName.text
do{
try self.context.save()
}
catch{
}
self.fetchPerople()
}
alertController.addAction(saveBtn)
self.present(alertController, animated: true, completion: nil)
}
func gotoPersonDetails(personData:Person){
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 50
}
#objc func deleteRecord(sender: UIButton){
if items.count > 0{
let personRemove = self.items[sender.tag]
self.context.delete(personRemove)
do {
try self.context.save()
}
catch{
}
self.fetchPerople()
}
}
#IBOutlet weak var tableView: UITableView!
let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
var items : [Person] = [] {
didSet{
DispatchQueue.main.async {
self.tableView.reloadData()
}
}
}
override func viewDidLoad() {
super.viewDidLoad()
self.tableView.delegate = self
self.tableView.dataSource = self
tableView.register(UINib(nibName: String(describing: StundentCell.self), bundle: .main), forCellReuseIdentifier: String(describing: StundentCell.self))
}
#IBAction func addPerson(_ sender: UIBarButtonItem) {
showAlert()
}
private func showAlert(_ title:String = "Add new Item", message: String = "what is your name"){
let alertController = UIAlertController(title: title, message: message, preferredStyle: .alert)
alertController.addTextField()
let subbmitBtn = UIAlertAction(title: "Add Person", style: .default) { (action) in
let textField = alertController.textFields![0]
let newPerson = Person(context:self.context)
newPerson.name = textField.text
newPerson.age = 20
newPerson.gender = "Male"
do {
try self.context.save()
}
catch{
}
self.fetchPerople()
}
alertController.addAction(subbmitBtn)
self.present(alertController, animated: true, completion: nil)
}
func fetchPerople(){
do{
self.items = try context.fetch(Person.fetchRequest())
}
catch{
}
}
}
extension ViewController: UITableViewDelegate,UITableViewDataSource{
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return items.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
self.configurePersonCell(tableView, cellForRowAt: indexPath)
}
func configurePersonCell(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell{
guard let cell = tableView.dequeueReusableCell(withIdentifier: String(describing: StundentCell.self)) as? StundentCell else {return UITableViewCell()}
cell.studentData = items[indexPath.row]
cell.delete.tag = indexPath.row
cell.delete.addTarget(self, action: #selector(deleteRecord(sender:)), for: .touchUpInside)
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
var person = items[indexPath.row].name
let alertController = UIAlertController(title: "Edit Person", message: "Edit name", preferredStyle: .alert)
alertController.addTextField()
let alertField = alertController.textFields![0]
alertField.text = person
let saveBtn = UIAlertAction(title: "Save", style: .default) { (action) in
//get the person name in alert text field
let getName = alertController.textFields![0]
//edit the name of the person object
person = getName.text
do{
try self.context.save()
}
catch{
}
self.fetchPerople()
}
alertController.addAction(saveBtn)
self.present(alertController, animated: true, completion: nil)
}
func gotoPersonDetails(personData:Person){
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 50
}
#objc func deleteRecord(sender: UIButton){
/* fro api calling or firebase for deleting the rows in tableview
if items.count > 0 {
items.remove(at:sender.tag)
}
*/
if items.count > 0{
let personRemove = self.items[sender.tag]
//remove the person
self.context.delete(personRemove)
//save the data
do {
try self.context.save()
}
catch{
}
//refetch the data
self.fetchPerople()
}
}

Answer 1

You are modifying the name string but you don't update the record.
Get the whole person
let person = items[indexPath.row] // can be a constant because it's reference type
assign the name to the text field
alertField.text = person.name
and assign the edited name back
let nameField = alertController.textFields![0]
person.name = nameField.text
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let person = items[indexPath.row]
let alertController = UIAlertController(title: "Edit Person", message: "Edit name", preferredStyle: .alert)
alertController.addTextField()
let alertField = alertController.textFields![0]
alertField.text = person.name
let saveBtn = UIAlertAction(title: "Save", style: .default) { (action) in
let nameField = alertController.textFields![0]
person.name = nameField.text
do{
try self.context.save()
}
catch{
}
self.fetchPerople()
}
alertController.addAction(saveBtn)
self.present(alertController, animated: true, completion: nil)
}