当键盘显示时颤振形状消失

Question

我用Flutter创建了一个Form，但是当我专注于一个场并弹出键盘时，内容消失。

import 'dart:async'; 

import 'package:flutter/services.dart'; 
import 'package:flutter/widgets.dart'; 
import 'package:flutter/material.dart'; 
import 'package:greencat/greencat.dart'; 
import 'package:woody_app/Application.dart'; 
import 'package:woody_app/actions/AuthAction.dart'; 
import 'package:woody_app/states/AuthState.dart'; 

class ProfileScreen extends StatefulWidget { 
    @override 
    State createState() => new ProfileScreenState(); 
} 


class PersonData { 
    String name = ''; 
    String phoneNumber = ''; 
    String password = ''; 
} 

class ProfileScreenState extends State<ProfileScreen> { 
    final Store<AuthState, AuthAction<dynamic>> _store = Application.get().store; 
    StreamSubscription<AuthState> _subscriber; 

    final GlobalKey<ScaffoldState> _scaffoldKey = new GlobalKey<ScaffoldState>(); 

    PersonData person = new PersonData(); 

    void showInSnackBar(String value) { 
    _scaffoldKey.currentState.showSnackBar(new SnackBar(
     content: new Text(value) 
    )); 
    } 

    bool _autovalidate = false; 
    final GlobalKey<FormState> _formKey = new GlobalKey<FormState>(); 
    void _handleSubmitted() { 
    final FormState form = _formKey.currentState; 
    if (!form.validate()) { 
     _autovalidate = true; // Start validating on every change. 
     showInSnackBar('Please fix the errors in red before submitting.'); 
    } else { 
     form.save(); 
     showInSnackBar('${person.name}\'s phone number is ${person.phoneNumber}'); 
    } 
    } 

    String _validateName(String value) { 
    if (value.isEmpty) 
     return 'Name is required.'; 
    final RegExp nameExp = new RegExp(r'^[A-za-z ]+$'); 
    if (!nameExp.hasMatch(value)) 
     return 'Please enter only alphabetical characters.'; 
    return null; 
    } 

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

    _subscriber = _store.stream.listen((AuthState state) { 
     setState(() {}); 
    }); 
    } 


    @override 
    void dispose() { 
    _subscriber.cancel(); 
    super.dispose(); 
    } 

    @override 
    Widget build(BuildContext context) { 
    return new Container(child: new Form(
     key: _formKey, 
     autovalidate: _autovalidate, 
     child: new ListView(
      padding: const EdgeInsets.symmetric(horizontal: 16.0), 
      children: <Widget>[ 
      new TextFormField(
       decoration: const InputDecoration(
       icon: const Icon(Icons.person), 
       hintText: 'What do people call you?', 
       labelText: 'Name *', 
      ), 
       onSaved: (String value) { 
       person.name = value; 
       }, 
       validator: _validateName, 
      ), 
      new Container(
       padding: const EdgeInsets.all(20.0), 
       alignment: const FractionalOffset(0.5, 0.5), 
       child: new FlatButton(
       child: const Text('SUBMIT'), 
       onPressed: _handleSubmitted, 
      ), 
      ), 
      new Container(
       padding: const EdgeInsets.only(top: 20.0), 
       child: new Text('* indicates required field', style: Theme 
        .of(context) 
        .textTheme 
        .caption), 
      ), 
      ], 
     ) 
    )); 
    } 
} 

Answer 1

这听起来像你可能会遇到10826。