'Realm accessed from incorrect thread.'の修正

前提・実現したいこと

初めてのIOSアプリ開発をしております。
Realmのデータ取得時にエラーが発生してしまうのを解決したいです。

発生している問題・エラーメッセージ

'Realm accessed from incorrect thread.'

該当のソースコード

swift
1import UIKit
2import RealmSwift
3
4class AddMorningTextViewController : UIViewController, UITextFieldDelegate {
5    
6    
7    @IBOutlet weak var dateLabel: UILabel!
8    @IBOutlet weak var appreciationText1: UITextField!
9    @IBOutlet weak var appreciationText2: UITextField!
10    @IBOutlet weak var appreciationText3: UITextField!
11    
12    @IBOutlet weak var makeGoodText1: UITextField!
13    @IBOutlet weak var makeGoodText2: UITextField!
14    @IBOutlet weak var makeGoodText3: UITextField!
15    
16    var dateResult = ""
17    
18    
19    override func viewDidLoad() {
20        super.viewDidLoad()
21        
22        dateLabel.text = dateResult
23        appreciationText1.delegate = self
24        appreciationText2.delegate = self
25        appreciationText3.delegate = self
26        makeGoodText1.delegate = self
27        makeGoodText2.delegate = self
28        makeGoodText3.delegate = self
29    }
30    
31    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
32        self.view.endEditing(true)
33        return true
34    }
35    
36    override func viewWillAppear(_ animated: Bool) {
37        DispatchQueue(label: "background").async {
38            let realm = try! Realm()
39            
40            if let savedMorningTextData = realm.objects(MorningTextData.self).filter("date == '(self.dateResult)'").last {
41                
42                DispatchQueue.main.async {
43                    
44                    self.appreciationText1.text = savedMorningTextData.appreciationTextData1
45                    self.appreciationText2.text = savedMorningTextData.appreciationTextData2
46                    self.appreciationText3.text = savedMorningTextData.appreciationTextData3
47                    self.makeGoodText1.text = savedMorningTextData.makeGoodTextData1
48                    self.makeGoodText2.text = savedMorningTextData.makeGoodTextData2
49                    self.makeGoodText3.text = savedMorningTextData.makeGoodTextData3
50                    
51                }
52            }
53        }
54    }
55
56
57@IBAction func morningTextSaveButton(_ sender: UIButton) {
58    let title = "朝の日記の保存"
59    let message = "朝の日記が保存されました"
60    let okText = "OK"
61    
62    let alert = UIAlertController(title: title, message: message, preferredStyle: UIAlertController.Style.alert)
63    let okayButton = UIAlertAction(title: okText, style: UIAlertAction.Style.cancel, handler: nil)
64    alert.addAction(okayButton)
65    
66    present(alert, animated: true, completion: nil)
67    
68    let realm = try! Realm()
69    print(Realm.Configuration.defaultConfiguration.fileURL!)
70    let addMorningText = MorningTextData()
71    addMorningText.date = dateResult
72    addMorningText.appreciationTextData1 = appreciationText1.text ?? ""
73    addMorningText.appreciationTextData2 = appreciationText2.text ?? ""
74    addMorningText.appreciationTextData3 = appreciationText3.text ?? ""
75    addMorningText.makeGoodTextData1 = makeGoodText1.text ?? ""
76    addMorningText.makeGoodTextData2 = makeGoodText2.text ?? ""
77    addMorningText.makeGoodTextData3 = makeGoodText3.text ?? ""
78    
79    try! realm.write() {
80        realm.add(addMorningText, update: .all)
81    }
82}
83}
84
85
86
87

swift
1
2import Foundation
3import RealmSwift
4
5class MorningTextData: Object{
6    @objc dynamic var date: String = ""
7    @objc dynamic var appreciationTextData1 = ""
8    @objc dynamic var appreciationTextData2 = ""
9    @objc dynamic var appreciationTextData3 = ""
10    
11    @objc dynamic var makeGoodTextData1 = ""
12    @objc dynamic var makeGoodTextData2 = ""
13    @objc dynamic var makeGoodTextData3 = ""
14    
15    override static func primaryKey() -> String? {
16           return "date"
17    }
18    
19}
20