bobleesj

class SecondVC: UIViewController {
  @IBOutlet weak var secondVCLabel: UILabel!
  
  override func viewDidLoad() {
    super.viewDidLoad()
    NotificationCenter.default.addObserver(self, 
                                           selector: #selector(doThisWhenNotify), 
                                           name: NSNotification.Name(rawValue: myNotificationKey), 
                                           object: nil)
  }

bobleesj

@IBAction func tabToNotifyBack(_ sender: UIButton) {
  NotificationCenter.default.post(name: Notification.Name(rawValue: myNotificationKey), object: self)
  
  secondVCLabel.text = "Notification Completed!😜"
}

bobleesj

import UIKit

 class FirstVC: UIViewController {
   @IBOutlet weak var FirstVCLabel: UILabel!
   
   override func viewDidLoad() {
     super.viewDidLoad()
     NotificationCenter.default.addObserver(self, 
                                            selector: #selector(doSomethingAfterNotified),
                                            name: NSNotification.Name(rawValue: myNotificationKey), 

bobleesj

NotificationCenter.default.addObserver(forName: NSNotification.Name(rawValue: myNotificationKey), 
                                       object: nil, 
                                       queue: nil, 
                                       using:catchNotification)

bobleesj

func catchNotification(notification:Notification) -> Void {
  guard let name = notification.userInfo!["name"] else { return }
 
  FirstVCLabel.text = "My name, \(name) has been passed! 😄"
}

bobleesj

override func viewDidDisappear(_ animated: Bool) {
  super.viewDidDisappear(true)
  NotificationCenter.default.removeObserver(self)
}

bobleesj

class AddTaskViewController: UIViewController {
 @IBOutlet weak var taskTextField: UITextField!
 override func viewDidLoad() {
 super.viewDidLoad()
}
 @IBAction func buttonTapped(_ sender: UIButton) {
  let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
  let task = Task(context: context) // Link Task & Context
  task.name = taskTextField.text!
   

bobleesj

func saveContext () {
 let context = persistentContainer.viewContext
 if context.hasChanges {
 
  do {
  try context.save()
  } catch {
   let nserror = error as NSError
   fatalError("Unresolved error \(nserror), \(nserror.userInfo)")
 }

bobleesj

class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {

 @IBOutlet weak var tableView: UITableView!
 let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
 var tasks: [Task] = []
  
 override func viewDidLoad() {
 super.viewDidLoad()
  tableView.delegate = self
  tableView.dataSource = self

bobleesj

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
 let cell = UITableViewCell()
 let task = tasks[indexPath.row]
 
 if let myName = task.name {
  cell.textLabel?.text = myName
  }
  return cell
}
 func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {