Flutter表单数据发布

import 'package:flutter/material.dart';

class MyForm extends StatefulWidget {
  @override
  _MyFormState createState() => _MyFormState();
}

class _MyFormState extends State<MyForm> {
  final _formKey = GlobalKey<FormState>();
  String _name;
  String _email;

  void _submitForm() {
    if (_formKey.currentState.validate()) {
      // 处理表单提交
      print('Name: $_name');
      print('Email: $_email');
    }
  }

  @override
  Widget build(BuildContext context) {
    return Form(
      key: _formKey,
      child: Column(
        children: <Widget>[
          TextFormField(
            decoration: InputDecoration(labelText: 'Name'),
            validator: (value) {
              if (value.isEmpty) {
                return 'Please enter your name';
              }
              return null;
            },
            onSaved: (value) {
              _name = value;
            },
          ),
          TextFormField(
            decoration: InputDecoration(labelText: 'Email'),
            validator: (value) {
              if (value.isEmpty) {
                return 'Please enter your email';
              }
              return null;
            },
            onSaved: (value) {
              _email = value;
            },
          ),
          RaisedButton(
            onPressed: _submitForm,
            child: Text('Submit'),
          ),
        ],
      ),
    );
  }
}

TextFormField(
  decoration: InputDecoration(labelText: 'Name'),
  validator: (value) {
    if (value.isEmpty) {
      return 'Please enter your name';
    }
    return null;
  },
),

TextFormField(
  decoration: InputDecoration(labelText: 'Name'),
  onSaved: (value) {
    _name = value;
  },
),