I created Project that linked with coredata

Day62 Lab1(Core Data)/Day62 Lab1(Core Data).xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

Day62 Lab1(Core Data)/Day62 Lab1(Core Data).xcodeproj/xcuserdata/macbook.xcuserdatad/xcschemes/xcschememanagement.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>SchemeUserState</key>
+	<dict>
+		<key>Day62 Lab1(Core Data).xcscheme_^#shared#^_</key>
+		<dict>
+			<key>orderHint</key>
+			<integer>0</integer>
+		</dict>
+	</dict>
+</dict>
+</plist>

Day62 Lab1(Core Data)/Day62 Lab1(Core Data)/AppDelegate.swift

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+//
+//  AppDelegate.swift
+//  Day62 Lab1(Core Data)
+//
+//  Created by Fatimah Ayeidh on 18/05/1443 AH.
+//
+
+import UIKit
+import CoreData
+
+@main
+class AppDelegate: UIResponder, UIApplicationDelegate {
+
+
+    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
+        // Override point for customization after application launch.
+
+        DataService.shared.load()
+
+        return true
+    }
+
+    // MARK: UISceneSession Lifecycle
+
+    func application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration {
+        // Called when a new scene session is being created.
+        // Use this method to select a configuration to create the new scene with.
+        return UISceneConfiguration(name: "Default Configuration", sessionRole: connectingSceneSession.role)
+    }
+
+    func application(_ application: UIApplication, didDiscardSceneSessions sceneSessions: Set<UISceneSession>) {
+        // Called when the user discards a scene session.
+        // If any sessions were discarded while the application was not running, this will be called shortly after application:didFinishLaunchingWithOptions.
+        // Use this method to release any resources that were specific to the discarded scenes, as they will not return.
+    }
+}
+

Day62 Lab1(Core Data)/Day62 Lab1(Core Data)/Assets.xcassets/AccentColor.colorset/Contents.json

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+{
+  "colors" : [
+    {
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Day62 Lab1(Core Data)/Day62 Lab1(Core Data)/Assets.xcassets/AppIcon.appiconset/Contents.json

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+{
+  "images" : [
+    {
+      "idiom" : "iphone",
+      "scale" : "2x",
+      "size" : "20x20"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "3x",
+      "size" : "20x20"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "2x",
+      "size" : "29x29"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "3x",
+      "size" : "29x29"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "2x",
+      "size" : "40x40"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "3x",
+      "size" : "40x40"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "2x",
+      "size" : "60x60"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "3x",
+      "size" : "60x60"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "1x",
+      "size" : "20x20"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "20x20"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "1x",
+      "size" : "29x29"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "29x29"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "1x",
+      "size" : "40x40"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "40x40"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "1x",
+      "size" : "76x76"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "76x76"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "83.5x83.5"
+    },
+    {
+      "idiom" : "ios-marketing",
+      "scale" : "1x",
+      "size" : "1024x1024"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Day62 Lab1(Core Data)/Day62 Lab1(Core Data)/Assets.xcassets/Contents.json

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+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Day62 Lab1(Core Data)/Day62 Lab1(Core Data)/Assets.xcassets/coreData.imageset/Contents.json

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+{
+  "images" : [
+    {
+      "filename" : "coreData.png",
+      "idiom" : "universal",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Day62 Lab1(Core Data)/Day62 Lab1(Core Data)/Base.lproj/LaunchScreen.storyboard

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+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="13122.16" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="13104.12"/>
+        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="EHf-IW-A2E">
+            <objects>
+                <viewController id="01J-lp-oVM" sceneMemberID="viewController">
+                    <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" xcode11CocoaTouchSystemColor="systemBackgroundColor" cocoaTouchSystemColor="whiteColor"/>
+                        <viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="53" y="375"/>
+        </scene>
+    </scenes>
+</document>

Day62 Lab1(Core Data)/Day62 Lab1(Core Data)/Base.lproj/Main.storyboard

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+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="19162" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES">
+    <device id="retina6_1" orientation="portrait" appearance="light"/>
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="19144"/>
+    </dependencies>
+    <scenes/>
+</document>

Day62 Lab1(Core Data)/Day62 Lab1(Core Data)/Customers/Customer.swift

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+//
+//  Customer.swift
+//  Day62 Lab1(Core Data)
+//
+//  Created by Fatimah Ayeidh on 23/05/1443 AH.
+//
+
+import UIKit
+import CoreData
+
+
+var selectedIndex = -1
+
+class CustomersVC: UITableViewController, NSFetchedResultsControllerDelegate {
+
+    var fetchedResultsController: NSFetchedResultsController<Customer>?
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+
+        navigationItem.rightBarButtonItem = UIBarButtonItem(
+            title: "Add",
+            style: .done,
+            target: self,
+            action: #selector(add)
+        )
+    }
+
+    override func viewWillAppear(_ animated: Bool) {
+        super.viewWillAppear(animated)
+        setupFetchedResultsController()
+    }
+
+    override func viewDidDisappear(_ animated: Bool) {
+        super.viewDidDisappear(animated)
+        fetchedResultsController = nil
+    }
+
+    func setupFetchedResultsController() {
+        let fetchRequest: NSFetchRequest<Customer> = Customer.fetchRequest()
+        fetchRequest.sortDescriptors = [
+            NSSortDescriptor(key: "firstName", ascending: false),
+
+        ]
+
+        fetchedResultsController = NSFetchedResultsController(
+            fetchRequest: fetchRequest,
+            managedObjectContext: DataService.shared.viewContext,
+            sectionNameKeyPath: nil,
+            cacheName: nil
+        )
+        fetchedResultsController?.delegate = self
+
+        do {
+            try fetchedResultsController?.performFetch()
+            tableView.reloadData()
+        } catch {
+            fatalError("The fetch could not be performd: \(error.localizedDescription)")
+        }
+    }
+
+
+    @objc func add() {
+        let newVC = NewCustomer()
+        present(newVC, animated: true, completion: nil)
+    }
+
+    func controllerDidChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) {
+
+        tableView.reloadData()
+    }
+}
+
+extension CustomersVC {
+    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
+        guard let customers = fetchedResultsController?.fetchedObjects else { return 0 }
+
+        return customers.count
+    }
+
+    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
+        let cell = UITableViewCell.init(style: .subtitle, reuseIdentifier: "123")
+
+        let customer = fetchedResultsController?.fetchedObjects?[indexPath.row]
+
+        cell.textLabel?.text = "First Name: \(customer?.firstName ?? "")"
+        cell.detailTextLabel?.text = "Last Name:\(customer?.lastName ?? "")"
+
+        return cell
+    }
+
+    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
+
+        guard let customer = fetchedResultsController?.fetchedObjects?[indexPath.row] else {
+            return
+        }
+
+        let newVC = OrderVC()
+        newVC.customer = customer
+        newVC.title = fetchedResultsController?.fetchedObjects?[indexPath.row].firstName
+        let navController = UINavigationController(rootViewController: newVC)
+        present(navController, animated: true, completion: nil)
+    }
+
+
+    override func tableView(_ tableView: UITableView, trailingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {
+        return UISwipeActionsConfiguration(
+            actions: [
+                UIContextualAction(
+                    style: .destructive,
+                    title: "Delete",
+                    handler: { _, _, _ in
+                        guard let customer = self.fetchedResultsController?.fetchedObjects?[indexPath.row] else {
+                            return
+                        }
+                        DataService.shared.viewContext.delete(customer)
+                        DataService.shared.saveContext()
+                    }
+                )
+            ]
+        )
+    }
+}
+