如何使用onTap屏幕隐藏键盘？

问题描述

在 Flutter 中使用文本字段时， 我们如何能够在使用后仅通过点击屏幕来隐藏键盘。

解决方法

我们可以使用FocusNode

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      onTap: () {
       FocusScope.of(context).requestFocus(new FocusNode());
      },child: MaterialApp(
        title: 'Flutter Demo',theme: ThemeData(
          primarySwatch: Colors.blue,),home: MyHomePage(),);
  }
}

,

我们可以利用 FocusScope.of(context).unfocus();隐藏键盘。用手势检测器包裹整个 Scaffold 并在点击时使用 FocusScope.of(context).unfocus();在屏幕的任何部分点击时隐藏键盘。

请参考以下工作代码。

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',theme: ThemeData(
        primarySwatch: Colors.blue,visualDensity: VisualDensity.adaptivePlatformDensity,home: MyHomePage(title: 'Flutter Demo Home Page'),);
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key,this.title}) : super(key: key);
  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  TextEditingController _controller = new TextEditingController();
  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      onTap: () {
       
        FocusScope.of(context).unfocus(); // To hide the keyboard
      },child: Scaffold(
        appBar: AppBar(
          title: Text(widget.title),body: TextFormField(
          controller: _controller,decoration: new InputDecoration(labelText: 'Example Text'),);
  }
}