Edit the contents list of TableViewCell in Swift - ios

Question

I have a TableViewController with lists of data entry using CoreData. I also have ViewController with UITextView as linked by Segue to TableViewController. I have completed operations like add, save and delete on items.
Now I am working on edit by linking the selected TableViewCell to UITextView on next ViewController.I have created an action DONE on ViewController.I am able to pass data from selected Cell to TextView of next ViewController using Segue.
Now, I need to update the edited text on UITextView by clicking DONE button to back to Cells of TableViewController and also save data to CoreData. Plzz give the genuine advices and suggestions....I am new to Swift and I have enclosed my code here.
import UIKit
import CoreData
class ToDoTableViewController: UITableViewController {
var listItems = [NSManagedObject]()
override func viewDidLoad() {
super.viewDidLoad()
self.navigationItem.rightBarButtonItem = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.add, target: self , action: #selector(ToDoTableViewController.addItem))
}
func addItem(){
let alertController = UIAlertController(title: "To Do Tasks Lists!!!!", message: "Write Down...", preferredStyle: .alert)
let confirmAction = UIAlertAction(title: "Confirm", style: UIAlertActionStyle.default, handler: ({
(_) in
if let field = alertController.textFields![0] as? UITextField {
self.saveItem(itemToSave: (field.text!))
self.tableView.reloadData()
}
}
))
let cancelAction = UIAlertAction(title: "Cancel", style: UIAlertActionStyle.cancel, handler: nil)
alertController.addTextField(configurationHandler: ({
(textField) in
textField.placeholder = "Type in Something!!!!"
}))
alertController.addAction(confirmAction)
alertController.addAction(cancelAction)
self.present(alertController, animated: true, completion: nil)
}
func saveItem(itemToSave : String){
let appDelegate = UIApplication.shared.delegate as! AppDelegate
let managedContext = appDelegate.managedObjectContext
let entity = NSEntityDescription.entity(forEntityName: "ListEntity", in: managedContext)
let item = NSManagedObject(entity: entity!, insertInto: managedContext)
item.setValue(itemToSave, forKey: "item")
do {
try managedContext.save()
listItems.append(item)
}
catch {
print("Error")
}
}
override func viewWillAppear(_ animated: Bool) {
let appDelegate = UIApplication.shared.delegate as! AppDelegate
let managedContext = appDelegate.managedObjectContext
let fetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName: "ListEntity")
do{
let results = try managedContext.fetch(fetchRequest)
listItems = results as! [NSManagedObject]
}
catch {
print("Error")
}
}
override func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
return true
}
override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
if editingStyle == .delete {
let appDelegate = UIApplication.shared.delegate as! AppDelegate
let managedContext = appDelegate.managedObjectContext
let objectToDelete = listItems[indexPath.row]
listItems.remove(at: indexPath.row)
managedContext.delete(objectToDelete)
tableView.deleteRows(at: [indexPath], with: .fade)
do {
try managedContext.save()
}
catch {
print("Error")
}
}
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return listItems.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell")! as UITableViewCell
let item = listItems[indexPath.row]
cell.textLabel?.text = item.value(forKey: "item") as! String?
cell.backgroundColor = UIColor.clear
return cell
}
func getIndexPathForSelectedCell() -> IndexPath?
{
var indexPath2:IndexPath?
if tableView.indexPathsForSelectedRows!.count > 0 {
indexPath2 = tableView.indexPathsForSelectedRows![0]
}
return indexPath2
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if (segue.identifier == "detailView")
{
if let indexPath2 = getIndexPathForSelectedCell()
{
// here write code for move to next controller.
let vc = segue.destination as! TextEditViewController
//vc.FirstString = listItems[(indexPath2 as NSIndexPath).row] as String
let item = listItems[(indexPath2 as NSIndexPath).row]
vc.FirstString = (item.value(forKey: "item") as! String?)!
}
}
}
}
//TextEditViewController
import UIKit
import CoreData
class TextEditViewController: UIViewController {
#IBOutlet weak var textEdit: UITextView!
var FirstString = String()
override func viewDidLoad() {
super.viewDidLoad()
textEdit.text = FirstString
print(self.FirstString)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}

Answer 1

Pass your CoreData model reference to next screen:
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if (segue.identifier == "detailView")
{
if let indexPath2 = getIndexPathForSelectedCell()
{
// here write code for move to next controller.
let vc = segue.destination as! TextEditViewController
//vc.FirstString = listItems[(indexPath2 as NSIndexPath).row] as String
let item = listItems[(indexPath2 as NSIndexPath).row]
vc.FirstString = (item.value(forKey: "item") as! String?)!
vc.recentItem = item; //Like this. Create a recentItem refrence to your next controller of NSManagedObject or your custom core data modal.
}
}
}
When you are done with your editing in TextEditViewController:
recentItem.item = "String" //Your updated string
let appDelegate = UIApplication.shared.delegate as! AppDelegate
let managedContext = appDelegate.managedObjectContext
do {
try managedContext.save()
}
catch {
print("Error")
}
Hope this will work...!!