質問編集履歴
1
コードを追加
test
CHANGED
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File without changes
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test
CHANGED
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@@ -8,4 +8,41 @@
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8
8
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9
9
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画面2から1に戻って2にするとリストの定義文が作動して過去のリストが全て消えてしまう。
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10
10
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11
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### 該当コード
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11
12
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13
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~~~Dart
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14
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class MyScreen2 extends StatefulWidget {
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15
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const MyScreen2({Key? key}) : super(key: key);
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16
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+
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17
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@override
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State<MyScreen2> createState() => _MyScreen2State();
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}
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20
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21
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class _MyScreen2State extends State<MyScreen2> {
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22
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var subjectname;
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23
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List<String> subjectlist = [];
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24
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Widget build(BuildContext context) {
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25
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return Scaffold(
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26
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body: ListView.builder(
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27
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itemCount: subjectlist.length,
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28
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itemBuilder: (context, index3) {
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29
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return ListTile(
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30
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leading: Icon(Icons.edit),
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31
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title: Text(subjectlist[index3]),
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32
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);
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33
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}),
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34
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floatingActionButton: FloatingActionButton(
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35
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onPressed: () async {
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36
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final result =
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37
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await DialogUtils.showEditingDialog(context, subjectname);
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38
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setState(() {
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39
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subjectname = result ?? subjectname;
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40
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subjectlist.add(subjectname);
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41
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});
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42
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},
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43
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child: Text("追加"),
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44
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),
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45
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);
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46
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}
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47
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}
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48
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~~~
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