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首先，我來自法國，非常抱歉我的英語。無法用Core Data更新值
其次，我是開發新手，我已經開發了一個添加數據的代碼，並且在用Core Data顯示它們之後。它的作品.ok
但後我想更新，但我有一個問題，我不知道爲什麼我不能更新我的價值。有一個錯誤：「致命錯誤：意外地發現零，而解包可選值」
我已經嘗試了許多解決方案，因爲1周後，但無法找到問題。謝謝如果有人能幫助我！哪怕是一點點的幫助:)
這是我的代碼（SWIFT 2.3）：
作秀表視圖：
import UIKit
import CoreData
class ProduitTableViewController: UITableViewController {
@IBOutlet var table: UITableView!
var produits = [NSManagedObject]()
func refreshStories(refreshControl: UIRefreshControl) {
produits.removeAll()
fetchData()
self.table.reloadData()
refreshControl.endRefreshing()
}
override func viewDidLoad() {
super.viewDidLoad()
self.fetchData()
self.table.addSubview(self.refreshControl!)
self.refreshControl?.addTarget(self, action: #selector(ProduitTableViewController.refreshStories(_:)), forControlEvents: UIControlEvents.ValueChanged)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func fetchData() {
let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
let managedContext = appDelegate.managedObjectContext
//2
let fetchRequest = NSFetchRequest(entityName: "Produits")
let sort = NSSortDescriptor(key:"dateAjout", ascending:true)
fetchRequest.sortDescriptors = [sort]
//3
do {
let results = try managedContext.executeFetchRequest(fetchRequest)
produits = results as! [NSManagedObject]
} catch let error as NSError {
print("Donnees non recu \(error), \(error.userInfo)")
}
}
// MARK: - Table view data source
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
// #warning Incomplete implementation, return the number of sections
return 1
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete implementation, return the number of rows
return self.produits.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("Cell")
let produit = produits[indexPath.row]
cell!.textLabel!.text = produit.valueForKey("nom") as? String
/*
let id = produit.valueForKey("id") as? String
let date = produit.valueForKey("date") as? NSDate
let localNotification = UILocalNotification()
localNotification.userInfo = ["id" : id!]
localNotification.soundName = UILocalNotificationDefaultSoundName
localNotification.alertBody = "expiré"
localNotification.fireDate = date
UIApplication.sharedApplication().scheduleLocalNotification(localNotification)
UIApplication.sharedApplication().applicationIconBadgeNumber += 1
*/
return cell!
}
override func tableView(tableView: UITableView, editActionsForRowAtIndexPath indexPath: NSIndexPath) -> [UITableViewRowAction]? {
let supprimer = UITableViewRowAction(style: .Normal, title: "Suppr.") { action, index in
let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
let moc = appDelegate.managedObjectContext
// 3
moc.deleteObject(self.produits[indexPath.row])
appDelegate.saveContext()
// 4
self.produits.removeAtIndex(indexPath.row)
tableView.reloadData()
}
supprimer.backgroundColor = UIColor.redColor()
let update = UITableViewRowAction(style: .Normal, title: "Modifier") { action, index in
}
update.backgroundColor = UIColor.blueColor()
return [supprimer]
}
override func tableView(tableView: UITableView, canEditRowAtIndexPath indexPath: NSIndexPath) -> Bool {
// the cells you would like the actions to appear needs to be editable
return true
}
override func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject!) {
if segue.identifier == "showDetail" {
if let destination = segue.destinationViewController as? DetailViewController {
let row = table.indexPathForSelectedRow?.row
let produit = produits[row!]
let nom = produit.valueForKey("nom") as? String
let id = produit.valueForKey("id") as? String
let detail = produit.valueForKey("detail") as? String
let date = produit.valueForKey("date") as? NSDate
let time = date
let formatter = NSDateFormatter()
formatter.dateFormat = "dd-MM-YY HH:mm"
let formatteddate = formatter.stringFromDate(time!)
destination.dataNom = nom!
destination.dataId = id!
destination.dataDetail = detail!
destination.dataDate = formatteddate
}
}
}
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
if table.cellForRowAtIndexPath(indexPath) != nil {
self.performSegueWithIdentifier("showDetail", sender: self)
}
}
}
用於小區的演出細節：
import CoreData
import UIKit
class DetailViewController: UIViewController {
@IBOutlet var Label: UILabel!
@IBOutlet var Detail: UITextView!
@IBOutlet weak var Date: UILabel!
@IBOutlet weak var Id: UILabel!
var dataNom = ""
var dataDetail = ""
var dataDate = ""
var dataId = ""
override func viewDidLoad() {
super.viewDidLoad()
Label.text = dataNom
Detail.text = dataDetail
Date.text = dataDate
Id.text = dataId
// Do any additional setup after loading the view
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject!) {
if segue.identifier == "ModifierDetail" {
if let destination = segue.destinationViewController as? ModifierViewController {
destination.modifierNom = dataNom
destination.modifierId = dataId
destination.modifierDetail = dataDetail
destination.modifierDate = dataDate
}
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
*/
}
最後更新/修改我的詳細信息：
import UIKit
import CoreData
class ModifierViewController: UIViewController {
@IBOutlet weak var Nom: UITextField!
@IBOutlet weak var Detail: UITextView!
@IBOutlet weak var Date: UITextField!
var Produits: NSManagedObject!
var managedContext: NSManagedObjectContext!
var modifierNom = ""
var modifierDetail = ""
var modifierDate = ""
var modifierId = ""
override func viewDidLoad() {
super.viewDidLoad()
Nom.text = modifierNom
Detail.text = modifierDetail
Date.text = modifierDate
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
@IBAction func Annuler(sender: UIBarButtonItem) {
navigationController?.popViewControllerAnimated(true)
}
@IBAction func Modifier(sender: UIButton) {
let fetchRequest = NSFetchRequest(entityName:"Produits")
fetchRequest.predicate = NSPredicate(format: "nom = %@", modifierNom)
do {
let list = try managedContext.executeFetchRequest(fetchRequest) as! [Produit]
if list.count == 0 // Check notificationId available then not save
{
let newManagedObject = NSEntityDescription.insertNewObjectForEntityForName("Produits", inManagedObjectContext: managedContext)
newManagedObject.setValue(modifierNom, forKey: "nom")
}
// success ...
} catch let error as NSError {
// failure
print("Fetch failed: \(error.localizedDescription)")
}
}
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
*/
}
我有創造這個其他的文件：
import Foundation
import CoreData
@objc(Produit)
class Produit: NSManagedObject {
@NSManaged var nom:String!
}
我現在很久很抱歉 –
你知道，哪行代碼崩潰？ – FelixSFD
的可能重複[這是什麼？「致命錯誤：意外發現零而展開的可選值」的意思（http://stackoverflow.com/questions/32170456/what-does-fatal-error-unexpectedly-found-nil-同時，去包裹-AN-可選-VALU） – FelixSFD