swift - 数据未连接到 tableView

Question

我正在构建一个应用程序，它具有三个 tableViews：一个用于俱乐部，另一个用于会员，这会导致交易。前两个 tableView 加上它们的“add”控制器正在工作，而第三个没有。据我所知，添加控制器工作，因为我知道事务被保存到核心数据。但是事务没有显示在 tableView 中，我不知道如何解决这个问题，因为这是我的第一个应用程序。

交易VC代码

import UIKit
import MessageUI
import CoreData

class TransactionViewController: UIViewController, MFMailComposeViewControllerDelegate, UITableViewDelegate, UITableViewDataSource {


    @IBOutlet weak var tableViewTransaction: UITableView!

    let dateFromatter = DateFormatter()

    var member: Member?

    override func viewDidLoad() {
        super.viewDidLoad()

        dateFromatter.timeStyle = .long
        dateFromatter.dateStyle = .long

    }

    override func viewWillAppear(_ animated: Bool) {
        self.tableViewTransaction.reloadData()
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


    @IBAction func addNewTransaction(_ sender: Any) {
        performSegue(withIdentifier: "newTransaction", sender: self)
    }
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        guard let destination = segue.destination as? AddTransactionViewController else {
            return
        }
        destination.member = member
    }



    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return member?.transactions?.count ?? 0
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableViewTransaction.dequeueReusableCell(withIdentifier: "transactionCell", for: indexPath)
        if let transaction = member?.transactions?[indexPath.row] {
            cell.textLabel?.text = transaction.reason

            if let date = transaction.date {
                cell.detailTextLabel?.text = dateFromatter.string(from: date)
            }
        }
        return cell
    }















   @IBAction func sendEmail(_ sender: Any) {
        let mailComposeVC = configureMailController()
        if MFMailComposeViewController.canSendMail() {
            self.present(mailComposeVC, animated: true, completion: nil)
        } else {
            showMailError()
        }
    }
    func configureMailController() -> MFMailComposeViewController {
        let mailComposerVC = MFMailComposeViewController()
        mailComposerVC.mailComposeDelegate = self

        mailComposerVC.setSubject("MAHNUNG")
        mailComposerVC.setMessageBody("Hey, ich habe gesehen, dass dein Kontostand in der Buchhaltung zu tief ist. Ich bitte dich daher schnellst möglich mir das Geld zu bringen. Gruss", isHTML: false)

        return mailComposerVC
}

    func showMailError() {
        let senMailErrorAlert = UIAlertController(title: "Could not send email", message: "Dein Gerät konnte die Email nicht senden.", preferredStyle: .alert)
        let dismiss = UIAlertAction(title: "Ok", style: .default, handler: nil)
        senMailErrorAlert.addAction(dismiss)
        self.present(senMailErrorAlert, animated: true, completion: nil)
    }
    func mailComposeController(_ controller: MFMailComposeViewController, didFinishWith result: MFMailComposeResult, error: Error?) {
        controller.dismiss(animated: true, completion: nil)
    }
}

addTransaction 代码：

import UIKit

class AddTransactionViewController: UIViewController, UITextFieldDelegate {



    @IBOutlet weak var reasonTextField: UITextField!
    @IBOutlet weak var amountTextField: UITextField!
    @IBOutlet weak var datePicker: UIDatePicker!

    var member: Member?

    override func viewDidLoad() {
        super.viewDidLoad()

        reasonTextField.delegate = self
        amountTextField.delegate = self

    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        reasonTextField.resignFirstResponder()
        amountTextField.resignFirstResponder()
        }

    @IBAction func saveTransaction(_ sender: Any) {
        let reason = reasonTextField.text
        let date = datePicker.date
        let moneyText = amountTextField.text ?? ""
        let money = Double(moneyText) ?? 0.0

        if let transaction = Trancsaction(money: money, reason: reason, date: date) {
            member?.addToRawTransactions(transaction)

            do {
                try transaction.managedObjectContext?.save()

                self.navigationController?.popViewController(animated: true)
            } catch {
                let alert = UIAlertController(title: "Transaktion konnte nicht gespeichert werden", message: "Bitte wiederholen Sie ihre Eingabe", preferredStyle: .alert)
                present(alert, animated: true, completion: nil)
            }
}

    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
        textField.resignFirstResponder()
        return true
    }
}
}

核心数据：

import UIKit
import CoreData

@objc(Trancsaction)
public class Trancsaction: NSManagedObject {
    var date: Date? {
        get {
            return rawDate as Date?
      }
        set {
            rawDate = newValue as NSDate?

        }
    }

    convenience init?(money: Double, reason: String?, date: Date?) {
        let appDelegate = UIApplication.shared.delegate as? AppDelegate
        guard let context = appDelegate?.persistentContainer.viewContext else {
            return nil
        }
        self.init(entity: Trancsaction.entity() , insertInto: context)

        self.date = date
        self.money = money
        self.reason = reason
    }
}

标签： swiftxcodecore-datatableview