Form和TextFormField是在 Flutter 中输入文本时非常有用的小部件。
我们可以提供一种在键盘上按“下一步”时移动输入焦点的便捷方法吗？
使用FocusScopeNode，这是非常容易做到的。
假设您有一个电子邮件和密码输入表单，如下所示：
代码语言：javascript复制import 'package:flutter/material.dart';
class EmailPasswordSignInForm extends StatefulWidget {
@override
_EmailPasswordSignInFormState createState() =>
_EmailPasswordSignInFormState();
}
class _EmailPasswordSignInFormState extends State<EmailPasswordSignInForm> {
final FocusScopeNode _node = FocusScopeNode();
final GlobalKey<FormState> _formKey = GlobalKey<FormState>();
@override
void dispose() {
_node.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("FocusScopeNode "),
),
body: Container(
child: Form(
key: _formKey,
child: FocusScope(
node: _node,
child: Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
children: <Widget>[
// email
TextFormField(
decoration: InputDecoration(
labelText: 'Email',
hintText: 'https://luckly.work/',
),
textInputAction: TextInputAction.next,
keyboardType: TextInputType.emailAddress,
// move to the next field
onEditingComplete: _node.nextFocus,
),
// password
TextFormField(
decoration: InputDecoration(
labelText: 'Password',
),
obscureText: true,
textInputAction: TextInputAction.done,
// move to the next field
onEditingComplete: _node.nextFocus,
),
// submit
RaisedButton(
child: Text('Sign In'),
onPressed: () {/* submit code here */},
),
],
),
),
),
),
);
}
}
