重复细胞上的每一个载荷，从coredata

该图显示了重复的行为中的每一条记录CoreData其保持乘上每一个重新加载。 代码如下。 发生什么事是每当我增添的记录，然后我看记录显示我的记录。 然后我击回的网页之后，当我点击查看记录我看到的副本相同的记录。 所以现在我有2相同的记录。 任何人都可以请帮助我和我认为问题表看法，所以这是我的表图控制代码

import UIKit
import CoreData
var Rec = [Records]()
class TableViewController: UITableViewController {
    var firstLoad = true
    func nondel() -> [Records]
    {
        var nodellist = [Records]()
        for note in Rec
        {
            if(note.del == nil)
            {
                nodellist.append(note)
            }
        }
        return nodellist

    }
    override func viewDidLoad() {
        super.viewDidLoad()
        if(firstLoad)
        {
        firstLoad = false
            let appDelegate = UIApplication.shared.delegate as! AppDelegate
            let context:NSManagedObjectContext = appDelegate.persistentContainer.viewContext

            let request = NSFetchRequest<NSFetchRequestResult>(entityName: "Records")
            do{
                let results: NSArray = try context.fetch(request) as NSArray
                for result in results {
                    let note = result as! Records
                    Rec.append(note)
                }
            }
            catch
            {
                print("Fetch Failed")
            }
        }

    
    }

    
    
    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "myCell") as! TableViewCell
        
        let thisrec: Records!
        thisrec = nondel()[indexPath.row]
        cell.idLB.text = thisrec.id
        cell.nameLB.text = thisrec.name
        cell.lastLB.text = thisrec.last
        cell.genderLB.text = thisrec.gender
        cell.ageLB.text = thisrec.age
        cell.addressLB.text = thisrec.address
        return cell


}
    
    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        // #warning Incomplete implementation, return the number of rows
        return nondel().count
    }
    override func viewDidAppear(_ animated: Bool) {
        tableView.reloadData()
    }
    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath){
        self.performSegue(withIdentifier: "editNote", sender: self)
        }
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if(segue.identifier == "editNote")
        {
            let indexPath = tableView.indexPathForSelectedRow!
            let recDetail = segue.destination as? AddViewController
            let selectedCell: Records!
            selectedCell = nondel()[indexPath.row]
            recDetail!.selectedCell = selectedCell
            tableView.deselectRow(at: indexPath, animated: true)
        }
    }
}