TableController doesn't show the data from Core-data - ios

Question

I want to make simple Contact by using core-data and tableView for practicing CoreData.
So I have watched youtube and write it's code.
Finally, I thought that I got this, I made by myself, but tableView doesn't contain any data, I could compile though. Could anyone tell me what is wrong? and hopefully tell me how to check the stored data in core-data?
import UIKit
import CoreData
class ViewController: UIViewController {
var context = (UIApplication.sharedApplication().delegate as!AppDelegate).managedObjectContext
var stores : Contact? = nil
#IBOutlet weak var nameTextField: UITextField!
#IBOutlet weak var phoneTextField: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
if stores != nil {
nameTextField.text = stores?.name
phoneTextField.text = stores?.phone
context?.save(nil)
} }
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
#IBAction func saveTapped(sender: AnyObject) {
let context = self.context
// Get the description of the entity
if stores != nil { let storeDescription = NSEntityDescription.entityForName("stores", inManagedObjectContext: context!)
// Then, We Create the Managed Object to be inserted into the cored data
stores = Contact(entity: storeDescription!, insertIntoManagedObjectContext: context)
}
// set the attributes
stores?.name = nameTextField.text
stores?.phone = phoneTextField.text
context!.save(nil) // Save The object
let alert = UIAlertView(title: "저장 완료", message: "\(nameTextField.text)님이 전화번호부에 저장 되었습니다", delegate: nil, cancelButtonTitle: "OK")
alert.show()
}
}
And here is my tableviewcontroller.
import UIKit
import CoreData
class TableViewController: UITableViewController , NSFetchedResultsControllerDelegate{
let context = (UIApplication.sharedApplication().delegate as! AppDelegate).managedObjectContext
var frc : NSFetchedResultsController = NSFetchedResultsController()
var stores = [Contact]()
override func viewDidLoad() {
super.viewDidLoad()
frc.delegate = self
frc.performFetch(nil)
// Uncomment the following line to preserve selection between presentations
// self.clearsSelectionOnViewWillAppear = false
// Uncomment the following line to display an Edit button in the navigation bar for this view controller.
// self.navigationItem.rightBarButtonItem = self.editButtonItem()
}
override func viewWillAppear(animated: Bool) {
var error:NSError?
let request = NSFetchRequest(entityName: "Contact")
stores = context?.executeFetchRequest(request, error: &error) as! [Contact]
self.tableView.reloadData()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// MARK: - Table view data source
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
// #warning Potentially incomplete method implementation.
// Return the number of sections.
return 1
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete method implementation.
// Return the number of rows in the section.
return stores.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath) as! UITableViewCell
// Configure the cell...
let save = stores[indexPath.row]
cell.textLabel!.text = save.name
cell.detailTextLabel!.text = save.phone
return cell
}
func getFetchedResultsController() ->NSFetchedResultsController {
frc = NSFetchedResultsController(fetchRequest: listFetchRequest(), managedObjectContext: context!, sectionNameKeyPath: nil, cacheName: nil)
return frc
}
func listFetchRequest() -> NSFetchRequest {
let fetchRequest = NSFetchRequest(entityName: "Contact")
let sortDescriptor = NSSortDescriptor(key: "name", ascending: true)
fetchRequest.sortDescriptors = [sortDescriptor]
return fetchRequest
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
if segue.identifier == "edit"
{
let destViewController = segue.destinationViewController as! ViewController
let indexPath = self.tableView.indexPathForSelectedRow()
let row = indexPath?.row
destViewController.stores = stores[row!]
}
}
}
Update ----Since I fixed my viewController, It works. It would be like
import UIKit
import CoreData
class ViewController: UIViewController {
var context = (UIApplication.sharedApplication().delegate as!AppDelegate).managedObjectContext
var stores : Contact? = nil
#IBOutlet weak var nameTextField: UITextField!
#IBOutlet weak var phoneTextField: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
if stores != nil {
nameTextField.text = stores?.name
phoneTextField.text = stores?.phone
context?.save(nil)
} }
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
#IBAction func saveTapped(sender: AnyObject) {
if stores != nil {
edit()
}else {
addNew()
}
navigationController?.popViewControllerAnimated(true)
}
func addNew() {
let description = NSEntityDescription.entityForName("Contact", inManagedObjectContext: context!)
let stores = Contact(entity: description!, insertIntoManagedObjectContext: context)
stores.name = nameTextField.text
stores.phone = phoneTextField.text
context?.save(nil)
}
func edit() {
stores!.name = nameTextField.text
stores!.phone = phoneTextField.text
context?.save(nil)
}
}

Answer 1

1. How to locate and View the SQLlite file.
You can find out the path of the .sqlite file using the below function.
func applicationDirectoryPath() -> String {
return NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true).last! as! String
}
Then use any third party tools to view the content of the Sqlite database like SQLLite Manager (a firefox addon)
2. Displaying data in TableView.
In your tableViewController, instead of using stores variable Use NSFetchedResultController (frc) to retrieve and show the data in TableView. Check out this link for using NSFetchedResultController with TableViewController.