我需要用我的核心數據中的數據填充我的表視圖。 我可以顯示我的行,但是,我無法填充我的tableview! 我使用swift 3和Xcode 8. 這是我的代碼,在這個控制器中我必須顯示列表。從CoreData使用NSFetchRequest填充TableView - SWIFT3 Xcode 8
class iTableViewController: UITableViewController, NSFetchedResultsControllerDelegate{
@IBOutlet var iTableView: UITableView!
override func viewDidLoad(){
super.viewDidLoad()
iTableView.dataSource = self
iTableView.delegate = self
let appDelegate = UIApplication.shared.delegate as! AppDelegate
let managerContext = appDelegate.persistentContainer.viewContext
let interventsFetch = NSFetchRequest<NSFetchRequestResult>(entityName: "Intervento")
do{
//results
let fetchedIntervents = try managerContext.fetch(interventsFetch) as! [Intervento]
for interv in fetchedIntervents{
print(interv.stampRow())
}
NSLog(String(fetchedIntervents.count))
}catch{
fatalError("Failed to fetch employees: \(error)")
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
//number of sections
override func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
//numer of rows
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 1
}
//cell
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell: UITableViewCell = UITableViewCell(style: UITableViewCellStyle.subtitle, reuseIdentifier: "cell")
cell.accessoryType = UITableViewCellAccessoryType.disclosureIndicator
//print the example cell
cell.textLabel?.text = "title"
cell.detailTextLabel?.text = "subtitle"
return cell
}
//swipe and delete
override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath){
if(editingStyle == UITableViewCellEditingStyle.delete){
//TODO
}
}
// click cell
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath){
performSegue(withIdentifier: "segueDetail", sender: self)
}
override func viewDidAppear(_ animated: Bool){
//iTableView.reloadData()
}
override func viewWillDisappear(_ animated: Bool) {
//iTableView.reloadData()
//fetchData()
}
}
這是我的課
extension Intervento {
@nonobjc public class func fetchRequest() -> NSFetchRequest<Intervento> {
return NSFetchRequest<Intervento>(entityName: "Intervento");
}
@NSManaged public var cliente: Int32
@NSManaged public var dataFine: String?
@NSManaged public var dataInizio: String?
@NSManaged public var descrizione: String?
@NSManaged public var foto: String?
@NSManaged public var id: Int32
@NSManaged public var stato: String?
@NSManaged public var tecnico: String?
func stampRow()->String{
let v1 = String(id) + " " + String(cliente) + " "
let v2 = dataInizio! + " " + dataFine! + " "
let v3 = stato! + " " + tecnico! + " " + descrizione!
return v1 + v2 + v3
}
}
,這是我對保存數據(它的工作原理)
@IBAction func addButton(_ sender: Any){
//genero la data
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "dd-MM-yyyy HH:mm"
let strDate = dateFormatter.string(from: myDatePicker.date)
let appDelegate = UIApplication.shared.delegate as! AppDelegate
let managerContext = appDelegate.persistentContainer.viewContext
let newInt = NSEntityDescription.insertNewObject(forEntityName: "Intervento", into: managerContext)
newInt.setValue(1, forKey: "id")
newInt.setValue(strDate, forKey: "dataInizio")
newInt.setValue("", forKey: "dataFine")
newInt.setValue(2, forKey: "cliente")
newInt.setValue("Matt", forKey: "tecnico")
newInt.setValue(stato[1], forKey: "stato")
newInt.setValue("", forKey: "descrizione")
newInt.setValue("", forKey: "foto")
do{
try managerContext.save()
print("saved")
}catch let error as NSError{
//errore salvataggio
print("Could not fetch \(error), \(error.userInfo)")
}
}
你的代碼是混亂的。一個'UITableViewController'包含一個預定義的'UITableView'實例,連接了委託和數據源。你使用'NSFetchedResultsController'嗎?該代碼與手動獲取數據非常不同。你的數據源數組在哪裏?班級名稱應該以大寫字母開頭。 – vadian
PS:選中核心數據複選框創建一個新的主 - 明細項目。您幾乎可以免費獲得所需的全部代碼。 – vadian
謝謝你,我已經添加了我的課程和保存在數據庫中的代碼。也許我需要使用NsFetchedResultController,但是如何? :( – Matt