在 Flutter 中使用 SQFlite 在两个页面之间传递数据

Question

I have two pages with each page containing one TextFormField . I want to store data entered in first page and display it in the second page and so on. I want this to happen using Database(Sqflite). I'm unable to figure out on how to store two different values belonging to the same row of a single Database table.

Answer 1

Since the app requires multiple pages, I think PageView would be the best for this case.

For the answer to your question checkout below code:

import 'package:flutter/material.dart';

class PageViewDemo extends StatefulWidget {
  @override
  _PageViewDemoState createState() => _PageViewDemoState();
}

class _PageViewDemoState extends State<PageViewDemo> {
  Map<String, bool> _importantData;
  List<String> _pages;
  @override
  void initState() {
    super.initState();
    _importantData = Map<String, bool>();
    _pages = <String>['one', 'two', 'three', 'four'];
  }

  @override
  Widget build(BuildContext context) {
    return PageView(
      children: _pages.map<Widget>((String pageText) {
        return Center(
          child: Card(
            child: Column(
              mainAxisAlignment: MainAxisAlignment.center,
              children: <Widget>[
                Text(
                  pageText.toUpperCase(),
                  style: TextStyle(fontSize: 15.0, fontWeight: FontWeight.bold),
                ),
                CheckboxListTile(
                  title: Text('isChecked: '),
                  controlAffinity: ListTileControlAffinity.leading,
                  value: _importantData[pageText] ?? false,
                  onChanged: (bool newValue) {
                    setState(() {
                      _importantData[pageText] = newValue;
                    });
                  },
                )
              ],
            ),
          ),
        );
      }).toList(),
    );
  }
}

Note: This code is just for an explanation, It is not meant to be used directly for the solution.

As you can see, there are 4 different pages with checkboxes for each page. The map _importantData is used for storing the checked status for each page.

Just like _importantData to store the checked status, any model class instance can be used for storing the data. Like to store the checked status, any model class instance can be used for storing the data. Like _importantData`, any model class can store data that needs to be accessed across all the pages.

For example, you can create a data class to store values that user will input on each page. Just make sure to create a single instance of the model class and pass it through each page to access/update relative values.