当我选择一个文本字段时，键盘会移到它上面

问题描述

当我选择一个文本字段时，将显示键盘但键盘隐藏了我选择的文本字段.有人有解决方案吗?

When i select a Textfield, the keyboard is going to be shown but the keyboard hide my selected TextField. Does someone have a solution?

推荐答案

当 TextField 获得焦点时，编写动画并向上移动 TextField 容器.

Compose an animation and move your TextField container up when a TextField gets focus.

要了解有关制作动画的信息，请参阅:在 Dart 的 Flutter 框架中组合动画和链接动画

For learning about composing animations refer to:Composing Animations and Chaining Animations in Dart's Flutter Framework

使用 Flutter 的 FocusNode 检测 TextField 上的焦点

Use Flutter's FocusNode to detect the focus on a TextField

这里我写了一个完全符合你要求的例子:

Here I've written an example that does exactly what you want:

import 'package:flutter/material.dart';

void main() => runApp(new MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'Animation Demo',
      theme: new ThemeData(
        primaryColor: new Color(0xFFFF0000),
      ),
      home: new FormDemo(),
    );
  }
}

class FormDemo extends StatefulWidget {
  @override
  _FormDemoState createState() => _FormDemoState();
}

class _FormDemoState extends State<FormDemo> with SingleTickerProviderStateMixin {
  AnimationController _controller;
  Animation _animation;

  FocusNode _focusNode = FocusNode();

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

    _controller = AnimationController(vsync: this, duration: Duration(milliseconds: 300));
    _animation = Tween(begin: 300.0, end: 50.0).animate(_controller)
    ..addListener(() {
      setState(() {});
    });

    _focusNode.addListener(() {
      if (_focusNode.hasFocus) {
        _controller.forward();
      } else {
        _controller.reverse();
      }
    });
  }

  @override
  void dispose() {
    _controller.dispose();
    _focusNode.dispose();

    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      resizeToAvoidBottomPadding: false, // this avoids the overflow error
      appBar: AppBar(
        title: Text('TextField Animation Demo'),
      ),
      body: new InkWell( // to dismiss the keyboard when the user tabs out of the TextField
        splashColor: Colors.transparent,
        onTap: () {
          FocusScope.of(context).requestFocus(FocusNode());
        },
        child: Container(
          padding: const EdgeInsets.all(20.0),
          child: Column(
            children: <Widget>[
              SizedBox(height: _animation.value),
              TextFormField(
                decoration: InputDecoration(
                  labelText: 'I move!',
                ),
                focusNode: _focusNode,
              )
            ],
          ),
        ),
      ),
    );
  }
}

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