Question

这是我的要求，当我单击“添加”按钮时，应动态生成具有三个文本字段的新卡，以及如何为每个TextField分配动态创建的TextEditingControllers>还是有其他方法可以从TextFields获取价值？

final name1 = new TextField(
    controller: name1Controller,
    decoration: InputDecoration(
        labelText: 'Full Name', border: OutlineInputBorder()));

final age1 = new TextField(
    controller: age1Controler,
    keyboardType: TextInputType.number,
    decoration:
        InputDecoration(labelText: 'Age', border: OutlineInputBorder()));

final studyjob1 = new TextField(
    controller: study1Controller,
    decoration: InputDecoration(
        labelText: 'Study / Job', border: OutlineInputBorder()));

final person1Card = new Card(
  shape: RoundedRectangleBorder(
    borderRadius: BorderRadius.circular(15.0),
  ),
  elevation: 10,
  child: Padding(
    padding: EdgeInsets.only(top: 2.0, left: 6.0, right: 6.0, bottom: 2.0),
    child: Column(
      children: <Widget>[
        Text('Person 1'),
        SizedBox(height: 3.0),
        name1,
        SizedBox(height: 10.0),
        age1,
        SizedBox(height: 10.0),
        studyjob1,
        SizedBox(height: 10.0),
      ],
    ),
  ),
);

return Scaffold(
    appBar: AppBar(
      title: Text('New Entry'),
    ),
    body: SingleChildScrollView(
      child: Container(
        child: Container(
          color: Colors.white,
          child: Padding(
            padding: const EdgeInsets.all(15.0),
            child: Column(
              children: <Widget>[
                person1Card,
                SizedBox(
                  height: 10.0,
                ),
                saveButton
              ],
            ),
          ),
        ),
      ),
    ))

Answer 1

import 'package:flutter/material.dart';

void main() {
  runApp(App());
}

class App extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Home(),
    );
  }
}

class Home extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: RaisedButton(
          child: Text('Add entries'),
          onPressed: () async {
            List<PersonEntry> persons = await Navigator.push(
              context,
              MaterialPageRoute(
                builder: (context) => SOF(),
              ),
            );
            if (persons != null) persons.forEach(print);
          },
        ),
      ),
    );
  }
}

class SOF extends StatefulWidget {
  @override
  _SOFState createState() => _SOFState();
}

class _SOFState extends State<SOF> {
  var nameTECs = <TextEditingController>[];
  var ageTECs = <TextEditingController>[];
  var jobTECs = <TextEditingController>[];
  var cards = <Card>[];

  Card createCard() {
    var nameController = TextEditingController();
    var ageController = TextEditingController();
    var jobController = TextEditingController();
    nameTECs.add(nameController);
    ageTECs.add(ageController);
    jobTECs.add(jobController);
    return Card(
      child: Column(
        mainAxisSize: MainAxisSize.min,
        children: <Widget>[
          Text('Person ${cards.length + 1}'),
          TextField(
              controller: nameController,
              decoration: InputDecoration(labelText: 'Full Name')),
          TextField(
              controller: ageController,
              decoration: InputDecoration(labelText: 'Age')),
          TextField(
              controller: jobController,
              decoration: InputDecoration(labelText: 'Study/ job')),
        ],
      ),
    );
  }

  @override
  void initState() {
    super.initState();
    cards.add(createCard());
  }

  _onDone() {
    List<PersonEntry> entries = [];
    for (int i = 0; i < cards.length; i++) {
      var name = nameTECs[i].text;
      var age = ageTECs[i].text;
      var job = jobTECs[i].text;
      entries.add(PersonEntry(name, age, job));
    }
    Navigator.pop(context, entries);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(),
      body: Column(
        children: <Widget>[
          Expanded(
            child: ListView.builder(
              itemCount: cards.length,
              itemBuilder: (BuildContext context, int index) {
                return cards[index];
              },
            ),
          ),
          Padding(
            padding: const EdgeInsets.all(16.0),
            child: RaisedButton(
              child: Text('add new'),
              onPressed: () => setState(() => cards.add(createCard())),
            ),
          )
        ],
      ),
      floatingActionButton:
          FloatingActionButton(child: Icon(Icons.done), onPressed: _onDone),
    );
  }
}

class PersonEntry {
  final String name;
  final String age;
  final String studyJob;

  PersonEntry(this.name, this.age, this.studyJob);
  @override
  String toString() {
    return 'Person: name= $name, age= $age, study job= $studyJob';
  }
}

Answer 2

您可以为List使用controllers。

例如：

class PersonControllers {
    final TextEditingController name;
    final TextEditingController age;
    final TextEditingController job;

    PersonControllers(this.name, this.age, this.job);
}

然后在您的小部件中

final List<PersonControllers> personControllers = List<PersonControllers>();

在您的initState

personControllers.add(PersonController(TextEditingController(),TextEditingController(),TextEditingController());

创建一个buildCard方法：

Widget buildCard(PersonControllers controllers){
    return Card(
        shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(15.0),
        ),
        elevation: 10,
        child: Padding(
            padding: EdgeInsets.only(top: 2.0, left: 6.0, right: 6.0, bottom: 2.0),
            child: Column(
                children: <Widget>[
                    Text('Person 1'),
                    SizedBox(height: 3.0),
                    _buildNameField(controllers.name),
                    SizedBox(height: 10.0),
                    _buildAgeField(controllers.age),
                    SizedBox(height: 10.0),
                    _buildJobField(controllers.job),
                    SizedBox(height: 10.0),
                ],
            ),
        ),
    );
}

最后使用您的build方法：

return Scaffold(
    appBar: AppBar(
      title: Text('New Entry'),
    ),
    body: SingleChildScrollView(
      child: Container(
        child: Container(
          color: Colors.white,
          child: Padding(
            padding: const EdgeInsets.all(15.0),
            child: Column(
              children: <Widget>[
                ...personControllers.map((personController) => _buildCard(personController),
                SizedBox(
                  height: 10.0,
                ),
                RaisedButton(
                     child: Text("Add"),
                     onPressed: (){
                         setState((){
                             personControllers.add(PersonController(
                                 TextEditingController(),
                                 TextEditingController(),
                                 TextEditingController()
                            });
                        );
                     }
                 ),
              ],
            ),
          ),
        ),
      ),
    ))

单击按钮时颤动创建动态TextField

2 个答案: