英文:
the sqlite deletion method does not work in flutter either
问题
以下是您要翻译的内容：
i'm making a todo app using sqlite deleteSqlite, it doesn't delete when the button is pressed during the deletion process, but I wonder why it deletes when it does hot resart?
Future<void> _deleteTodoItem(int id, String text, bool isDone) async {
await TodoModelDao().deleteTodo(id, text, isDone);
refleshList();
}
Future<List<TodoModel>> _showAllData() async {
var todoList = await TodoModelDao().getAllData();
return todoList;
}
refleshList() {
setState(() {
_showAllData();
});
}
Future<void> deleteTodo(int id, String text, bool isDone) async {
var db = await DatabaseHelper.dbAccess();
await db.delete(TABLENAME, where: "$ID = ?", whereArgs: [id]);
}
Future<List<TodoModel>> getAllData() async {
var db = await DatabaseHelper.dbAccess();
List<Map<String, dynamic>> maps = await db.rawQuery("SELECT * FROM $TABLENAME");
return List.generate(maps.length, (i) {
var row = maps[i];
return TodoModel(id: row[ID], text: row[TEXT]);
});
}
child: IconButton(
onPressed: () {
_deleteTodoItem(widget.todoModel.id, widget.todoModel.text,
widget.todoModel.isDone);
},
icon: const Icon(Icons.delete),
color: Coloors.whiteColor,
iconSize: 18,
),
英文:
i'm making a todo app using sqlite deleteSqlite, it doesn't delete when the button is pressed during the deletion process, but I wonder why it deletes when it does hot resart?
Future<void> _deleteTodoItem(int id, String text, bool isDone) async {
await TodoModelDao().deleteTodo(id, text, isDone);
refleshList();
}
Future<List<TodoModel>> _showAllData() async {
var todoList = await TodoModelDao().getAllData();
return todoList;
}
refleshList() {
setState(() {
_showAllData();
});
}
Future<void> deleteTodo(int id, String text, bool isDone) async {
var db = await DatabaseHelper.dbAccess();
await db.delete(TABLENAME, where: "$ID = ?", whereArgs: [id]);
}
Future<List<TodoModel>> getAllData() async {
var db = await DatabaseHelper.dbAccess();
List<Map<String, dynamic>> maps = await db.rawQuery("SELECT * FROM $TABLENAME");
return List.generate(maps.length, (i) {
var row = maps[i];
return TodoModel(id: row[ID], text: row[TEXT]);
});
}
child: IconButton(
onPressed: () {
_deleteTodoItem(widget.todoModel.id, widget.todoModel.text,
widget.todoModel.isDone);
},
icon: const Icon(Icons.delete),
color: Coloors.whiteColor,
iconSize: 18,
),
答案1
得分: 1
删除操作已经执行，但是Flutter不知道你想要在删除后重新渲染UI。
当你热重启时，它会重新渲染。有许多方法可以解决这个问题。
一个简单的解决方案是调用 setState 强制重新渲染。
你可以尝试将你的代码的某些部分（IconButton）替换为以下内容：
child: IconButton(
onPressed: () async {
await _deleteTodoItem(widget.todoModel.id, widget.todoModel.text,
widget.todoModel.isDone);
// 强制重新渲染UI
setState(() {
// 在这里更新你的变量...
_showAllData();
});
},
icon: const Icon(Icons.delete),
color: Coloors.whiteColor, // 这里的拼写可能有误，应该是Colors.whiteColor
iconSize: 18,
),
英文:
It does delete, but flutter is unaware that you want to re-render ui after deletion.<br>
When you hot restart, it re-renders it.There are many work around this. <br>One simple solution would be calling setState to force re-render.<br>
You can try replacing some part of your code (IconButton) with the following.
child: IconButton(
onPressed: () async {
await _deleteTodoItem(widget.todoModel.id, widget.todoModel.text,
widget.todoModel.isDone);
// force re-render ui
setState(() {
// update your variable here...
_showAllData();
});
},
icon: const Icon(Icons.delete),
color: Coloors.whiteColor,
iconSize: 18,
),
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