swift 値渡しがされない場合の解決方法

Xcodeでコレクションビューを使ったTODOアプリを作っています。
collectionViewのセルをロングタップすると入力画面に遷移し、次画面にて入力された内容をセル上のラベルにそれぞれ表示したいのですが値が渡らず困っています・・・。
NavigationControllerは使っておらず、segueにはpresentModallyを使っています。エラー等も出ていません。
何か解る方がいましたらご教授お願いしたいです。よろしくお願いします。

swift
1
2import UIKit
3
4struct MyTodoItem {
5    var title: String
6    var dateString: String? 
7}
8
9
10class ViewController: UIViewController,UICollectionViewDelegate,UICollectionViewDataSource,UIGestureRecognizerDelegate,nextViewControllerDelegate {
11    
12    
13    
14    @IBOutlet weak var todoCollection: UICollectionView!
15    
16    let toDos = ["１","２","３","４","５","６"]
17    
18    var todos: [MyTodoItem] = [
19        MyTodoItem(title: "１", dateString: nil),
20        MyTodoItem(title: "２", dateString: nil),
21        MyTodoItem(title: "３", dateString: nil),
22        MyTodoItem(title: "４", dateString: nil),
23        MyTodoItem(title: "５", dateString: nil),
24        MyTodoItem(title: "６", dateString: nil),
25    ]
26    
27    
28    
29
30    override func viewDidLoad() {
31        super.viewDidLoad()
32        
33        let layout = UICollectionViewFlowLayout()
34        layout.sectionInset = UIEdgeInsets(top: 20, left: 20, bottom: 20, right: 20)
35        layout.itemSize = CGSize(width: 100,height: 100)
36        todoCollection.collectionViewLayout = layout
37        
38        let longPressGestureRecognizer = UILongPressGestureRecognizer(target: self, action: #selector(cellLongPressed))
39        longPressGestureRecognizer.delegate = self
40        longPressGestureRecognizer.allowableMovement = 15
41        longPressGestureRecognizer.minimumPressDuration = 0.6
42        todoCollection.addGestureRecognizer(longPressGestureRecognizer)
43        
44    }
45    
46
47    func nextViewController(_ nextVC: NextViewController, didFinishText text: String?) {
48        
49       if let editingItem = self.editingItem {
50                
51                 todos[editingItem].dateString = text
52                   
53                   todoCollection.reloadItems(at: [IndexPath(item: editingItem, section: 0)])
54               }
55        
56        
57    }
58    
59    
60    
61    //表示するセルの数
62    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
63        return 6
64    }
65    
66    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
67        
68        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath)
69        cell.backgroundColor = .systemPink
70        
71        let item = todos[indexPath.row]
72
73       
74        let todoLabel = cell.contentView.viewWithTag(1) as! UILabel
75        todoLabel.text = item.title 
76        let dateLabel = cell.contentView.viewWithTag(2) as! UILabel
77        dateLabel.text = item.dateString       
78        
79        return cell
80        
81        
82    }
83    func collectionview(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
84        let horizontalSpace : CGFloat = 20
85        let cellSize : CGFloat = self.view.bounds.width / 3 - horizontalSpace
86        return CGSize(width: cellSize, height: cellSize)
87    }
88    
89    
90    override func didReceiveMemoryWarning() {
91        super.didReceiveMemoryWarning()
92    }
93    
94    @objc func cellLongPressed(sender: UILongPressGestureRecognizer){
95       
96        if sender.state == UIGestureRecognizer.State.began{
97            
98           performSegue(withIdentifier: "next", sender: nil)
99            
100        }
101        
102            
103       
104    }
105    
106    
107
108    var  editingItem: Int?
109       
110       
111       
112       
113   override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
114           
115         
116              let nextVC = segue.destination as! NextViewController
117               nextVC.delegate = self
118               
119           }
120    
121       
122
123}
124

swift
1
2import UIKit
3
4
5
6protocol nextViewControllerDelegate {
7    
8    func nextViewController(_ nextVC:NextViewController,didFinishText text: String?)
9}
10
11
12class NextViewController: UIViewController,UITextFieldDelegate {
13    
14    //デートピッカー
15    var datePicker :UIDatePicker = UIDatePicker()
16    
17   
18    @IBOutlet weak var dayTextField: UITextField!
19    
20
21   var delegate: nextViewControllerDelegate?
22    
23  
24    
25    
26    override func viewDidLoad() {
27        super.viewDidLoad()
28        
29    //デートピッカー
30        datePicker.datePickerMode = UIDatePicker.Mode.date
31        datePicker.timeZone = NSTimeZone.local
32        datePicker.locale = Locale(identifier: "ja")
33        dayTextField.inputView = datePicker
34    //デートピッカーのツールバー関係
35        let toolBar = UIToolbar(frame: CGRect(x: 0, y: 0, width: view.frame.size.width, height: 35))
36        let spaceItem = UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: self, action: #selector(done))
37        let doneItem = UIBarButtonItem(barButtonSystemItem: .done, target: self, action: #selector(done)); toolBar.setItems([spaceItem,doneItem],animated: true)
38
39        dayTextField.inputView = datePicker
40        dayTextField.inputAccessoryView = toolBar
41
42    }
43   //デートピッカーを閉じるメソッド
44    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
45
46        textField.resignFirstResponder()
47
48        return true
49    }
50  //デートピッカーにdoneボタン
51
52    @ objc func done(){
53        dayTextField.endEditing(true)
54
55        let formatter = DateFormatter()
56
57        formatter.dateFormat = "yyyy年MM月dd日"
58
59        dayTextField.text = "(formatter.string(from: datePicker.date))"
60
61    }
62
63    override func didReceiveMemoryWarning() {
64        super.didReceiveMemoryWarning()
65
66    }
67
68    
69    @IBAction func addButton(_ sender: Any) {
70        
71        
72        delegate?.nextViewController(self, didFinishText: dayTextField.text)
73               
74               self.dismiss(animated: true, completion: nil)
75         
76       
77        
78        
79        
80    }
81    
82   
83}
84

行動規範の内容に同意します

回答2件

ベストアンサー

下記の self.editingItem が nil だからじゃないですか？
self.editingItem の値が設定されていないように思います。

swift
1func nextViewController(_ nextVC: NextViewController, didFinishText text: String?) {
2
3       if let editingItem = self.editingItem {
4
5                 todos[editingItem].dateString = text
6
7                   todoCollection.reloadItems(at: [IndexPath(item: editingItem, section: 0)])
8               }
9
10
11    }