質問編集履歴
1
指摘箇所を修正いたしました。
test
CHANGED
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@@ -1 +1 @@
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TableViewCellのドラッグアンドドロップ
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TableViewCellのドラッグアンドドロップがうまくいかない
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test
CHANGED
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@@ -12,243 +12,239 @@
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### 該当のソースコード
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```swift
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import UIKit
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class ViewController: UIViewController,UITableViewDelegate,UITableViewDataSource,UINavigationControllerDelegate,UITableViewDragDelegate,UITableViewDropDelegate {
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//セクションの数を指定
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func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
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return array.count
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}
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//生成したセルを順番に表示
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func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
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let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
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//Table View CellのidentifireをCellとする
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cell.textLabel?.text = array[indexPath.row]
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cell.layer.backgroundColor = UIColor.clear.cgColor
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return cell
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}
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//セルの移動許可
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func tableView(_ tableView: UITableView, canMoveRowAt indexPath: IndexPath) -> Bool {
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return true
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}
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//セルを移動した時の処理
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func tableView(_ tableView: UITableView, moveRowAt sourceIndexPath: IndexPath, to destinationIndexPath: IndexPath) {
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// TODO: 入れ替え時の処理を実装する（データ制御など）
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}
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@IBOutlet var tableView: UITableView!
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//todoを入れる配列
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var array = [String]()
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override func viewDidLoad() {
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super.viewDidLoad()
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tableView.delegate = self
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tableView.dataSource = self
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tableView.dragDelegate = self
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tableView.dropDelegate = self
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tableView.dragInteractionEnabled = true
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//現在の配列を取り出す
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if (UserDefaults.standard.object(forKey: "todo") != nil){
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array = UserDefaults.standard.object(forKey: "todo") as! [String]
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}
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self.tableView.reloadData()
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}
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//セルのドラッグ処理
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func tableView(_ tableView: UITableView, itemsForBeginning session: UIDragSession, at indexPath: IndexPath) -> [UIDragItem] {
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//?????
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return [?????.dragItem (for: indexPath)]
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}
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func dragItem(for indexPath: IndexPath) -> UIDragItem {
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//?????
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let task = array[indexPath.row]
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let itemProvider = NSItemProvider(object: task as NSString)
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return UIDragItem(itemProvider: NSItemProvider())
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}
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//セルのドロップ
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func tableView(_ tableView: UITableView, dropSessionDidUpdate session: UIDropSession,
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withDestinationIndexPath destinationIndexPath: IndexPath?) -> UITableViewDropProposal {
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return UITableViewDropProposal(operation: .move, intent: .insertAtDestinationIndexPath)
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}
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func tableView(_ tableView: UITableView, performDropWith coordinator: UITableViewDropCoordinator) {
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guard let item = coordinator.items.first,
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let destinationIndexPath = coordinator.destinationIndexPath,
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let sourceIndexPath = item.sourceIndexPath else { return }
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tableView.performBatchUpdates({ [weak self] in
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guard let strongSelf = self else { return }
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//????
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strongSelf.array.moveItem(sourcePath: sourceIndexPath.row, destinationPath: destinationIndexPath.row)
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tableView.deleteRows(at: [sourceIndexPath], with: .automatic)
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tableView.insertRows(at: [destinationIndexPath], with: .automatic)
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}, completion: nil)
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coordinator.drop(item.dragItem, toRowAt: destinationIndexPath)
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}
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func moveItem(sourcePath: Int, destinationPath: Int) {
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let moveTask = array.remove(at: sourcePath)
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array.insert(moveTask, at: destinationPath)
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}
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//ここから下のコードはうまく動いている↓
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15
237
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```
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16
238
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17
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-
エラーメッセージ
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18
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-
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19
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```
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20
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-
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21
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-
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22
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-
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|
23
|
-
### 該当のソースコード
|
|
24
|
-
|
|
25
|
-
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|
26
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-
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27
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-
```swift
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28
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-
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29
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import UIKit
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30
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-
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31
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32
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33
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class ViewController: UIViewController,UITableViewDelegate,UITableViewDataSource,UINavigationControllerDelegate,UITableViewDragDelegate,UITableViewDropDelegate {
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34
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35
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36
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37
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38
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-
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|
39
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//セクションの数を指定
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40
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-
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41
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func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
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42
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43
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44
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return array.count
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}
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51
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52
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53
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54
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55
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//生成したセルを順番に表示
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56
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-
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57
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func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
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59
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60
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61
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let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
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62
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-
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63
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//Table View CellのidentifireをCellとする
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64
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-
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65
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66
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cell.textLabel?.text = array[indexPath.row]
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68
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69
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cell.layer.backgroundColor = UIColor.clear.cgColor
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return cell
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72
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73
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}
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74
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-
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75
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76
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-
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|
77
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-
//セルの移動許可
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78
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-
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79
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func tableView(_ tableView: UITableView, canMoveRowAt indexPath: IndexPath) -> Bool {
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80
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81
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return true
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82
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83
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}
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84
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-
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85
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-
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86
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-
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|
87
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-
//セルを移動した時の処理
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88
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-
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89
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-
func tableView(_ tableView: UITableView, moveRowAt sourceIndexPath: IndexPath, to destinationIndexPath: IndexPath) {
|
|
90
|
-
|
|
91
|
-
// TODO: 入れ替え時の処理を実装する（データ制御など）
|
|
92
|
-
|
|
93
|
-
|
|
94
|
-
|
|
95
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-
}
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96
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-
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97
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98
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99
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100
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101
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102
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103
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-
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104
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-
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105
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-
@IBOutlet var tableView: UITableView!
|
|
106
|
-
|
|
107
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-
|
|
108
|
-
|
|
109
|
-
//todoを入れる配列
|
|
110
|
-
|
|
111
|
-
|
|
112
|
-
|
|
113
|
-
var array = [String]()
|
|
114
|
-
|
|
115
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-
|
|
116
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-
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117
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-
override func viewDidLoad() {
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118
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-
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119
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super.viewDidLoad()
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120
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tableView.delegate = self
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122
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-
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123
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tableView.dataSource = self
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124
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-
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125
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tableView.dragDelegate = self
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126
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-
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127
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tableView.dropDelegate = self
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128
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-
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129
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tableView.dragInteractionEnabled = true
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130
|
-
|
|
131
|
-
//現在の配列を取り出す
|
|
132
|
-
|
|
133
|
-
if (UserDefaults.standard.object(forKey: "todo") != nil){
|
|
134
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-
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|
135
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-
array = UserDefaults.standard.object(forKey: "todo") as! [String]
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136
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-
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137
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-
}
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138
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-
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139
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-
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140
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-
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141
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-
self.tableView.reloadData()
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142
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-
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143
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-
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144
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-
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145
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-
}
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|
146
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-
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|
147
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-
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|
148
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-
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|
149
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-
//セルのドラッグ処理
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|
150
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-
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151
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-
func tableView(_ tableView: UITableView, itemsForBeginning session: UIDragSession, at indexPath: IndexPath) -> [UIDragItem] {
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152
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-
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153
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-
//?????
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154
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-
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155
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-
return [?????.dragItem (for: indexPath)]
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156
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-
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157
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}
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158
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159
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161
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162
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func dragItem(for indexPath: IndexPath) -> UIDragItem {
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164
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-
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165
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//?????
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166
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-
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167
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-
let task = array[indexPath.row]
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168
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-
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let itemProvider = NSItemProvider(object: task as NSString)
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-
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return UIDragItem(itemProvider: NSItemProvider())
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}
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176
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-
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177
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-
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178
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-
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179
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-
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180
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-
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181
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-
//セルのドロップ
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182
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-
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183
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-
func tableView(_ tableView: UITableView, dropSessionDidUpdate session: UIDropSession,
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184
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-
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185
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withDestinationIndexPath destinationIndexPath: IndexPath?) -> UITableViewDropProposal {
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186
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187
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return UITableViewDropProposal(operation: .move, intent: .insertAtDestinationIndexPath)
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188
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-
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189
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}
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190
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-
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191
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-
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192
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-
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193
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-
func tableView(_ tableView: UITableView, performDropWith coordinator: UITableViewDropCoordinator) {
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194
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-
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195
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guard let item = coordinator.items.first,
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196
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-
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197
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-
let destinationIndexPath = coordinator.destinationIndexPath,
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198
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-
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199
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-
let sourceIndexPath = item.sourceIndexPath else { return }
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200
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201
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202
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203
|
-
tableView.performBatchUpdates({ [weak self] in
|
|
204
|
-
|
|
205
|
-
guard let strongSelf = self else { return }
|
|
206
|
-
|
|
207
|
-
//????
|
|
208
|
-
|
|
209
|
-
strongSelf.array.moveItem(sourcePath: sourceIndexPath.row, destinationPath: destinationIndexPath.row)
|
|
210
|
-
|
|
211
|
-
tableView.deleteRows(at: [sourceIndexPath], with: .automatic)
|
|
212
|
-
|
|
213
|
-
tableView.insertRows(at: [destinationIndexPath], with: .automatic)
|
|
214
|
-
|
|
215
|
-
}, completion: nil)
|
|
216
|
-
|
|
217
|
-
coordinator.drop(item.dragItem, toRowAt: destinationIndexPath)
|
|
218
|
-
|
|
219
|
-
}
|
|
220
|
-
|
|
221
|
-
|
|
222
|
-
|
|
223
|
-
|
|
224
|
-
|
|
225
|
-
func moveItem(sourcePath: Int, destinationPath: Int) {
|
|
226
|
-
|
|
227
|
-
let moveTask = array.remove(at: sourcePath)
|
|
228
|
-
|
|
229
|
-
array.insert(moveTask, at: destinationPath)
|
|
230
|
-
|
|
231
|
-
}
|
|
232
|
-
|
|
233
|
-
|
|
234
|
-
|
|
235
|
-
|
|
236
|
-
|
|
237
|
-
|
|
238
|
-
|
|
239
|
-
//ここから下のコードはうまく動いている↓
|
|
240
|
-
|
|
241
|
-
```
|
|
242
|
-
|
|
243
239
|
|
|
244
240
|
|
|
245
241
|
### 試したこと
|
|
246
242
|
|
|
247
243
|
|
|
248
244
|
|
|
249
|
-
参考
|
|
245
|
+
参考サイト
|
|
250
|
-
|
|
246
|
+
|
|
251
|
-
https://dev.classmethod.jp/smartphone/iphone/uitableview-dragdelegate-dropdelegate1/
|
|
247
|
+
[UITableViewのdragDelegate, dropDelegateについて調べて試した](https://dev.classmethod.jp/smartphone/iphone/uitableview-dragdelegate-dropdelegate1/)
|
|
252
248
|
|
|
253
249
|
|
|
254
250
|
|