Question

**我正在尝试将新任务插入数据库，但是当我返回主屏幕时，没有任何更新，我应该重新加载以查看更改，您知道为什么会发生吗？

我尝试了几件事，但问题仍然存在。如果您需要更多详细信息，请告诉我。谢谢！ **

´import 'package:flutter/material.dart';
    import 'package:todo_task/models/Task.dart';
    import 'package:todo_task/utils/Helper.dart';
    import 'package:todo_task/widgets/reusable_card.dart';

    class TaskList extends StatefulWidget {
      final String status;

      const TaskList({this.status});

      @override
      _TaskListState createState() => _TaskListState();
    }

    class _TaskListState extends State<TaskList> {

      final Helper helper = Helper();

      @override
      Widget build(BuildContext context) {
        return FutureBuilder<List<Task>>(
            future: helper.getTasks(widget.status),
            builder: (BuildContext context, AsyncSnapshot<List<Task>> snapshot) {
              switch (snapshot.connectionState) {
                case ConnectionState.none:
                case ConnectionState.active:
                case ConnectionState.waiting:
                  return Center(child: CircularProgressIndicator());
                default:
                  if (snapshot.hasError)
                    return Center(child: Text('Error: ${snapshot.error}'));
                  else
                    return Column(
                      children: snapshot.data
                          .map((task) => ReusableCard(
                                task: task,
                              ))
                          .toList(),
                    );
              }
            });
      }
    }




    import 'package:flutter/material.dart';
    import 'package:todo_task/widgets/custom_date.dart';
    import 'package:todo_task/widgets/new_task.dart';
    import 'package:todo_task/widgets/task_list.dart';

    import '../constants.dart';

    class HomePage extends StatefulWidget {
      @override
      _HomePageState createState() => _HomePageState();
    }

    class _HomePageState extends State<HomePage> {

      @override
      void initState() { 
        super.initState();
      }

      @override
      Widget build(BuildContext context) {
        return Scaffold(
          body: SingleChildScrollView(
            child: Padding(
              padding: const EdgeInsets.fromLTRB(28.0, 20.0, 28.0, 20.0),
              child: Column(
                children: <Widget>[
                  Row(
                    mainAxisAlignment: MainAxisAlignment.spaceBetween,
                    children: <Widget>[
                      CustomDate(),
                      NewTask(),
                    ],
                  ),
                  Divider(),
                  SizedBox(height: 10),
                  Text(
                    'TODO TASKS',
                    style: kAppTitleTextStyle,
                  ),
                  SizedBox(height: 15),
                  TaskList(status: 'uncompleted',),
                  Divider(),
                  SizedBox(height: 10),
                  Text(
                    'DONE TASKS',
                    style: kAppTitleTextStyle,
                  ),
                  SizedBox(height: 15),
                  TaskList(status: 'completed',),
                  SizedBox(height: 15),
                ],
              ),
            ),
          ),
        );
      }
    }´

Answer 1

在更新数据库时，基本上是在更新设备中的文件，并且不会进行热重装。您应该做的是，在数据库操作完成后，更新获取任务的Future。

此外，请注意，最佳实践是通过以下方式保存在State的FutureBuilder中使用的Future实例：

setState((){
    this.tasksFuture = helper.getTasks(widget.status);
});

Futurebuilder无法与sqflite一起正常使用

1 个答案: