CoreDataについて知りたいのですが

MasterDetailAppテンプレートでCoreDataを使ってテーブルビューのセルの名前をつける条件を保存や更新したいです。

###下記のコードの概要
MasterDetailAppテンプレートのdetailViewControllerからボタンの押した回数に応じてcell_check（enum）のデータが送られてきます。それをCoreDataを使ってセル毎に保存しようと思ってます。
CoreDataの名前はPast_Dataです。中身はenum_CellCheck(Int16) です。

swift
1import UIKit
2import CoreData
3
4enum cell_check: Int {
5    case None   = 0       //未選択
6    case Fail   = 1       //非クリア
7    case Clear  = 2      //クリア
8}
9
10protocol send_any_data {
11    func send_data(data:cell_check)
12}
13
14
15class MasterViewController: UITableViewController, NSFetchedResultsControllerDelegate, send_any_data {
16
17    var detailViewController: DetailViewController? = nil
18    var managedObjectContext: NSManagedObjectContext? = nil
19    
20    
21    /**セルのタイトルを変えるか確認するcell_check値**/
22    var title_changer_checker:cell_check = .None
23    
24    /**セルに対するクリアしたかどうかの情報を保存する配列**/
25    var data_of_cells_cellcheck:[cell_check] = []
26    
27    /**セルの数字を保存**/
28    var cell_row_num : IndexPath?
29    
30
31    override func viewDidLoad() {
32        super.viewDidLoad()
33        
34        // Do any additional setup after loading the view.
35        navigationItem.leftBarButtonItem = editButtonItem
36        let addButton = UIBarButtonItem(barButtonSystemItem: .add, target: self, action: #selector(insertNewObject(_:)))
37        navigationItem.rightBarButtonItem = addButton
38        /**detailViewController変数にDetailViewControllerクラスを代入**/
39        if let split = splitViewController {
40            let controllers = split.viewControllers
41            detailViewController = (controllers[controllers.count-1] as! UINavigationController).topViewController as? DetailViewController
42        }
43    }
44
45    override func viewWillAppear(_ animated: Bool) {
46        
47        var cell:UITableViewCell
48        
49        if cell_row_num != nil {
50            cell = tableView.cellForRow(at: cell_row_num!)!
51            
52            if title_changer_checker == .Clear {
53                cell.textLabel?.text = "Cleared"
54                data_of_cells_cellcheck[cell_row_num!.row] = .Clear
55                title_changer_checker = .None
56            }
57            
58        }
59        
60        /**DetailViewControllerから戻った時に呼ばれる**/
61        clearsSelectionOnViewWillAppear = splitViewController!.isCollapsed
62        super.viewWillAppear(animated)
63    }
64
65    @objc
66    func insertNewObject(_ sender: Any) {
67        let context = self.fetchedResultsController.managedObjectContext
68        let newPastData = Past_Data(context: context)
69             
70        // If appropriate, configure the new managed object.
71        newPastData.enum_CellCheck = 0
72
73        // Save the context.
74        do {
75            try context.save()
76        } catch {
77        }
78    }
79
80    // MARK: - Segues
81
82    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
83        if segue.identifier == "showDetail" {
84            if let indexPath = tableView.indexPathForSelectedRow {
85                
86                cell_row_num = indexPath
87                
88                let object = fetchedResultsController.object(at: indexPath)
89                print(object)
90                //次のコントローラーの定義
91                let next_controller = (segue.destination as! UINavigationController).topViewController as! DetailViewController
92                next_controller.detailItem = object
93                next_controller.navigationItem.leftBarButtonItem = splitViewController?.displayModeButtonItem
94                next_controller.navigationItem.leftItemsSupplementBackButton = true
95                detailViewController = next_controller
96                next_controller.cell_check_sender = self
97            }
98        }
99    }
100
101    // MARK: - Table View
102
103    override func numberOfSections(in tableView: UITableView) -> Int {
104        return fetchedResultsController.sections?.count ?? 0
105    }
106
107    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
108        let sectionInfo = fetchedResultsController.sections![section]
109        return sectionInfo.numberOfObjects
110    }
111
112    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
113        let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
114        let object = fetchedResultsController.object(at: indexPath)
115        
116        data_of_cells_cellcheck.insert(.None, at: 0)
117        
118        configureCell(cell, withData: object)
119        
120        //print("(data_of_cells_cellcheck)")
121        
122        return cell
123    }
124
125    override func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
126        // 指定したアイテムを編集可能にしたくない場合はfalseを返します。
127        
128        return true
129    }
130
131    override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
132        if editingStyle == .delete {
133            let context = fetchedResultsController.managedObjectContext
134            context.delete(fetchedResultsController.object(at: indexPath))
135            
136            /**自作部分**/
137            
138            data_of_cells_cellcheck.remove(at: indexPath.row)
139            
140            /**自作部分終了**/
141            
142            do {
143                try context.save()
144            } catch {
145            }
146        }
147    }
148    
149    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
150        /**セルを選択した時呼ばれる**/
151        let cell = tableView.cellForRow(at: indexPath)
152        cell?.textLabel?.text = "Chosen"
153        
154    }
155    
156    func configureCell(_ cell: UITableViewCell, withData Data: Past_Data) {
157        
158        cell.textLabel!.text = "UNCLEARED"
159        
160        if Data.enum_CellCheck == 0 {
161            cell.textLabel!.text = "UNCLEARED"
162        }else if Data.enum_CellCheck == 1 {
163            cell.textLabel!.text = "Fail"
164        }else if Data.enum_CellCheck == 2 {
165            cell.textLabel!.text = "CLEARED"
166        }else{
167            cell.textLabel!.text = "「ERROR」 OR 「HUCKED NOW」"
168        }
169        
170    }
171
172    // MARK: - Fetched results controller
173
174    var fetchedResultsController: NSFetchedResultsController<Past_Data> {
175        if _fetchedResultsController != nil {
176            return _fetchedResultsController!
177        }
178        
179        let fetchRequest: NSFetchRequest<Past_Data> = Past_Data.fetchRequest()
180        
181        // バッチサイズを適切な数値に設定します。
182        fetchRequest.fetchBatchSize = 20
183        
184        // 必要に応じてソートキーを編集します。
185        let sortDescriptor = NSSortDescriptor(key: "enum_CellCheck", ascending: false)
186        
187        fetchRequest.sortDescriptors = [sortDescriptor]
188        
189        // 必要に応じて、セクション名のキーパスとキャッシュ名を編集します。
190        // セクション名キーパスのnilは「セクションなし」を意味します。
191        let aFetchedResultsController = NSFetchedResultsController(fetchRequest: fetchRequest, managedObjectContext: self.managedObjectContext!, sectionNameKeyPath: nil, cacheName: "Master")
192        aFetchedResultsController.delegate = self
193        _fetchedResultsController = aFetchedResultsController
194        
195        do {
196            try _fetchedResultsController!.performFetch()
197        } catch {
198        }
199        
200        return _fetchedResultsController!
201    }    
202    var _fetchedResultsController: NSFetchedResultsController<Past_Data>? = nil
203
204    func controllerWillChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) {
205        tableView.beginUpdates()
206    }
207
208    func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, didChange sectionInfo: NSFetchedResultsSectionInfo, atSectionIndex sectionIndex: Int, for type: NSFetchedResultsChangeType) {
209        switch type {
210            case .insert:
211                tableView.insertSections(IndexSet(integer: sectionIndex), with: .fade)
212            case .delete:
213                tableView.deleteSections(IndexSet(integer: sectionIndex), with: .fade)
214            default:
215                return
216        }
217    }
218
219    func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, didChange anObject: Any, at indexPath: IndexPath?, for type: NSFetchedResultsChangeType, newIndexPath: IndexPath?) {
220        
221        switch type {
222            case .insert:
223                tableView.insertRows(at: [newIndexPath!], with: .fade)
224            case .delete:
225                tableView.deleteRows(at: [indexPath!], with: .fade)
226            case .update:
227                configureCell(tableView.cellForRow(at: indexPath!)!, withData: anObject as! Past_Data)
228            case .move:
229                configureCell(tableView.cellForRow(at: indexPath!)!, withData: anObject as! Past_Data)
230                tableView.moveRow(at: indexPath!, to: newIndexPath!)
231            default:
232                return
233        }
234    }
235
236    func controllerDidChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) {
237        tableView.endUpdates()
238    }
239
240    func controllerDidChangeContent(controller: NSFetchedResultsController) {
241         // In the simplest, most efficient, case, reload the table view.
242         tableView.reloadData()
243     }
244     */
245    
246    // MARK: -DetailViewControllerクラスからのデータの遷移
247    
248    func send_data(data: cell_check) {
249        title_changer_checker = data
250/*******多分、ここでwarning********/
251        if let cell_num = cell_row_num {
252            let object = fetchedResultsController.object(at: cell_num)
253            object.enum_CellCheck = Int16(title_changer_checker.rawValue)
254        }
255    }
256    
257}
258
259