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Core Data Fatch, Save and Delete

  var userListData  = [NSManagedObject]()

    func fetchData(){

        userListData.removeAll()

        let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext

        let fetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName: "UserInfo")

        do{

            let results = try context.fetch(fetchRequest)

            let  dateCreated = results as! [NSManagedObject]

            for _datecreated in dateCreated {

                userListData.append(_datecreated)

                tableView.reloadData()

            }

        }catch let err as NSError {

            print(err.debugDescription)

        }

    }



///



    func deleteInfo(){

        let appDelegate = UIApplication.shared.delegate as! AppDelegate

        let context = appDelegate.persistentContainer.viewContext

        let requestDel = NSFetchRequest<NSFetchRequestResult>(entityName: "UserInfo")

        requestDel.returnsObjectsAsFaults = false

        let predicate = NSPredicate(format: "(user_name = %@)", deleteValue)

        requestDel.predicate = predicate

           do {

                let arrUsrObj = try context.fetch(requestDel)

                for usrObj in arrUsrObj as! [NSManagedObject] { // Fetching Object

                    context.delete(usrObj) // Deleting Object

               }

           } catch {

                print("Failed")

           }

           do {

               try context.save()

           } catch {

               print("Failed saving")

           }

    }



////





    func addData(user_name: String, user_email: String, user_dob: String, imageData: NSData) {

        

        guard let appDelegate = UIApplication.shared.delegate as? AppDelegate else {

            return

        }

        // 1

        let managedContext = appDelegate.persistentContainer.viewContext

        

        // 2

        let entity = NSEntityDescription.entity(forEntityName: "UserInfo", in: managedContext)!

        

        let UserData = NSManagedObject(entity: entity, insertInto: managedContext)

        

        // 3

        UserData.setValue(user_name, forKeyPath: "user_name")

        UserData.setValue(user_email, forKeyPath: "user_email")

        UserData.setValue(user_dob, forKeyPath: "user_dob")

        UserData.setValue(imageData, forKeyPath: "image")

        

        // 4

        do {

            try managedContext.save()

            getUserInfo.append(UserData)

            print("save data.")

        } catch let error as NSError {

            print("Could not save. \(error), \(error.userInfo)")

        }

    }


// 


    func UpdateInfo(){

        let managedContext = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext

        let entity = NSEntityDescription.entity(forEntityName: "UserInfo", in: managedContext)

                let request = NSFetchRequest<NSFetchRequestResult>()

                request.entity = entity

                let predicate = NSPredicate(format: "(user_name = %@)", userNameStr)

                request.predicate = predicate

                do {

                    let results =

                        try managedContext.fetch(request)

                    let objectUpdate = results[0] as! NSManagedObject

                    objectUpdate.setValue(userName_textField.text!, forKey: "user_name")

                    objectUpdate.setValue(userEmail_textField.text!, forKey: "user_email")

                    objectUpdate.setValue(userDOB_textField.text!, forKey: "user_dob")

                    do {

                        try managedContext.save()

                        userName_textField.text = ""

                        userEmail_textField.text = ""

                        userDOB_textField.text = ""

                        print("Update")

                    }catch _ as NSError {

                      print("Update")

                    }

                }

                catch _ as NSError {

                    print("Update")

                }

    }

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