Notes

ItemViewController

=================================================================================

//

// ItemViewController.swift

// tableviewwithitem

//

// Created by bmiit on 09/05/22.

//



import UIKit

import CoreData



class ItemViewController: UITableViewController{



var itemStore : ItemStore!



override func viewDidLoad() {

super.viewDidLoad()

}



override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {

return itemStore.allItems.count

}



override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {



let cell = tableView.dequeueReusableCell(withIdentifier: "ItemCell", for: indexPath)

as! ItemCell

let item = itemStore.allItems[indexPath.row]

cell.nameLabel.text=item.name

cell.serailNumberLabel.text=item.serialNumber

cell.valueLabel.text="$(item.valueInDollers)"

return cell



}



@IBAction func addNewItem(_ sender: UIBarButtonItem) {

let newItem = itemStore.createItem()



if let index = itemStore.allItems.firstIndex(of: newItem){

let indexPath = IndexPath(row: index,section: 0)

tableView.insertRows(at: [indexPath], with: .automatic)

}

}



override func tableView(_ tableView: UITableView, moveRowAt sourceIndexPath: IndexPath, to destinationIndexPath: IndexPath) {

itemStore.moveItem(from: sourceIndexPath.row, to: destinationIndexPath.row)

}



override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {

if editingStyle == .delete{

let item = itemStore.allItems[indexPath.row]

let title = "Delete (item.name)?";

let message = "Ek vaar vichar";

let ac = UIAlertController(title: title, message: message, preferredStyle: .actionSheet)

let cancelAction = UIAlertAction(title: "Cancel", style: .cancel, handler: nil)

ac.addAction(cancelAction)



let deleteAction = UIAlertAction(title: "Delete", style: .destructive, handler: {(action)->Void in

self.itemStore.removeItem(item)

self.tableView.deleteRows(at: [indexPath], with: .automatic)

})

ac.addAction(deleteAction)

present(ac, animated: true, completion: nil)

}

}



required init?(coder aDecoder: NSCoder) {

super.init(coder: aDecoder)

navigationItem.leftBarButtonItem = editButtonItem

}



override func prepare(for segue: UIStoryboardSegue, sender: Any?) {

switch segue.identifier {

case "showitem"?:

if let row = tableView.indexPathForSelectedRow?.row {

let item = itemStore.allItems[row]

let detailViewController = segue.destination as! DetailViewController

detailViewController.item = item

}

default:

preconditionFailure("Unexpected segue identifire.");

}

}



override func viewWillAppear(_ animated: Bool) {

super.viewWillAppear(animated)

tableView.reloadData()

}



}



=================================================================================







itemCell

=================================================================================

//

// ItemCell.swift

// tableviewwithitem

//

// Created by bmiit on 09/05/22.

//



import UIKit



class ItemCell: UITableViewCell {





@IBOutlet var nameLabel: UILabel!

@IBOutlet var valueLabel: UILabel!

@IBOutlet var serailNumberLabel: UILabel!



override func awakeFromNib() {

super.awakeFromNib()



}





}

=================================================================================



Item



================================================================================

//

// Item.swift

// tableviewwithitem

//

// Created by bmiit on 09/05/22.

//



import UIKit



class Item: NSObject {

var name:String

var valueInDollers: Int

var serialNumber: String?

let dateCreated : Date



init(name:String,valueInDollers:Int,serialNumber:String?)

{

self.name=name;

self.valueInDollers=valueInDollers;

self.serialNumber=serialNumber;

self.dateCreated=Date();

super.init();

}



convenience init( random: Bool = false) {

if random{

let adj = ["Red","Green","Yellow","Blue"];

let noun = ["Table","Chair","Sofa","T.v"];

var idx = arc4random_uniform(UInt32(adj.count))

let randomAdj = adj[Int(idx)];

idx=arc4random_uniform(UInt32(noun.count))

let randomNoun = noun[Int(idx)]

var randomName = "(randomNoun) (randomAdj)"

let randomValue = Int(arc4random_uniform(100));

let randmSerialnumber = UUID().uuidString.components(separatedBy: "-").first!

self.init(name:randomName,valueInDollers:randomValue,serialNumber:randmSerialnumber)

}

else{

self.init(name: "",valueInDollers:0, serialNumber: nil )

}

}



}

=================================================================================



ItemStore



=================================================================================



//

// ItemStore.swift

// tableviewwithitem

//

// Created by bmiit on 09/05/22.

//



import UIKit



class ItemStore{

var allItems = [Item]()



@discardableResult func createItem()->Item{

let newItem = Item(random: true)

allItems.append(newItem);

return newItem

}



func removeItem(_ item: Item) {

if let index = allItems.firstIndex(of: item){

allItems.remove(at: index);

}

}



func moveItem(from fromIndex: Int , to toIndex: Int){

if fromIndex == toIndex{

return

}

let movedItem = allItems[fromIndex]

allItems.remove(at: fromIndex)

allItems.insert(movedItem, at: toIndex)

}





}





=================================================================================



DetailViewController



=======================================================================







import UIKit



class DetailViewController: UIViewController,UITextFieldDelegate {



@IBOutlet var nameField: UITextField!

@IBOutlet var valueField: UITextField!

@IBOutlet var serailNumberField: UITextField!

@IBOutlet var dateLabel: UILabel!



func textFieldShouldReturn (_ textField: UITextField) ->Bool{

nameField.resignFirstResponder();

serailNumberField.resignFirstResponder();

valueField.resignFirstResponder();

return true

}



var item : Item!{

didSet{

navigationItem.title = item.name}

}



override func viewWillAppear(_ animated: Bool) {

super.viewWillAppear(animated)



nameField.text = item.name

serailNumberField.text = item.serialNumber

valueField.text = "(item.valueInDollers)"

dateLabel.text = "(item.dateCreated)"



}



let numberf: NumberFormatter = {

let form = NumberFormatter()

form.numberStyle = .decimal

return form

}()



override func viewWillDisappear(_ animated: Bool) {

super.viewWillDisappear(animated)

view.endEditing(true)







item.name = nameField.text ?? ""

item.serialNumber = serailNumberField.text



if let valueT = valueField.text, let value = numberf.number(from: valueT){

item.valueInDollers = value.intValue}

}

}



=================================================================================



sceneDeligate



=================================================================================



let itemStore = ItemStore()

let navController = window!.rootViewController as! UINavigationController

let itemController = navController.topViewController as! ItemViewController

itemController.itemStore = itemStore














—————————————
//
// AddStudentVC.swift
// CoreDataCRUD
//
// Created by bmiit on 5/9/22.
//

import UIKit

class AddStudentVC: UIViewController {


@IBOutlet weak var txtname: UITextField!

@IBOutlet weak var txtstd: UITextField!

@IBOutlet weak var txtschool: UITextField!

override func viewDidLoad() {
super.viewDidLoad()

// Do any additional setup after loading the view.
}



@IBAction func onClickAdd(_ sender: Any) {

if let name=txtname.text, let std=txtstd.text, let school=txtschool.text
{
let newstudent = Student(context: DBManager.share.context)
newstudent.name=name
newstudent.std=std
newstudent.school=school
DBManager.share.saveContext()
}
}

}
==================================================================
Scenedelegate
—————————
//
// SceneDelegate.swift
// CoreDataCRUD
//
// Created by bmiit on 5/9/22.
//

import UIKit

class SceneDelegate: UIResponder, UIWindowSceneDelegate {

var window: UIWindow?


DBManager.share.saveContext()
}


}

=======================================================================
Viewcontroller
—————————
//
// ViewController.swift
// CoreDataCRUD
//
// Created by bmiit on 5/9/22.
//

import UIKit

class ViewController: UIViewController {


@IBOutlet weak var studentTable: UITableView!

var students=[Student]()

override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}

override func viewWillAppear(_ animated: Bool) {
students=DBManager.share.fetchStudent()
studentTable.reloadData()
}


}

extension ViewController: UITableViewDelegate,UITableViewDataSource
{
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return students.count
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
let astudent=students[indexPath.row]
cell.textLabel?.text=astudent.name
cell.detailTextLabel?.text=astudent.school

return cell
}

func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
if editingStyle == UITableViewCell.EditingStyle.delete
{
do{
try DBManager.share.context.delete(students[indexPath.row])
}
catch{
print("error in deleting")
}
DBManager.share.saveContext()
students.remove(at: indexPath.row)
tableView.deleteRows(at: [indexPath], with: .automatic)
}
}


}

==================================
Addstudentvc
//
// AddStudentVC.swift
// CoreDataCRUD
//
// Created by bmiit on 5/9/22.
//

import UIKit

class AddStudentVC: UIViewController {


@IBOutlet weak var txtname: UITextField!

@IBOutlet weak var txtstd: UITextField!

@IBOutlet weak var txtschool: UITextField!

override func viewDidLoad() {
super.viewDidLoad()

// Do any additional setup after loading the view.
}



@IBAction func onClickAdd(_ sender: Any) {

if let name=txtname.text, let std=txtstd.text, let school=txtschool.text
{
let newstudent = Student(context: DBManager.share.context)
newstudent.name=name
newstudent.std=std
newstudent.school=school
DBManager.share.saveContext()
}
}

}
============================================================================
Dbmanager
//
// DBManager.swift
// CoreDataCRUD
//
// Created by bmiit on 5/9/22.
//

import UIKit
import CoreData

class DBManager{
static let share=DBManager()

lazy var persistentContainer: NSPersistentContainer = {

let container = NSPersistentContainer(name: "CoreDataCRUD")
container.loadPersistentStores(completionHandler: { (storeDescription, error) in
if let error = error as NSError? {

fatalError("Unresolved error (error), (error.userInfo)")
}
})
return container
}()

// MARK: - Core Data Saving support

lazy var context = persistentContainer.viewContext

func saveContext () {

if context.hasChanges {
do {
try context.save()
} catch {

let nserror = error as NSError
fatalError("Unresolved error (nserror), (nserror.userInfo)")
}
}
}

func fetchStudent()->[Student]
{
var student=[Student]()
let fetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName: Student.description())

do{
student = try context.fetch(fetchRequest) as! [Student]
}
catch{
print("fetching error")
}

return student

}
}