在单个TextField中为多行加下划线-颤动/Dart

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('TextField Demo'),
        ),
        body: Center(
          child: Padding(
            padding: EdgeInsets.all(20.0),
            child: TextField(
              decoration: InputDecoration(
                labelText: '多行文本',
                hintText: '请输入内容',
                border: UnderlineInputBorder(
                  borderSide: BorderSide(color: Colors.blue),
                ),
              ),
              maxLines: null,
              keyboardType: TextInputType.multiline,
              onChanged: (value) {
                // 处理文本变化事件
              },
            ),
          ),
        ),
      ),
    );
  }
}

dependencies:
  flutter_shake: ^0.1.0

import 'package:flutter/material.dart';
import 'package:flutter_shake/flutter_shake.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: ShakeDetector(
        child: Scaffold(
          appBar: AppBar(
            title: Text('TextField Demo'),
          ),
          body: Center(
            child: Padding(
              padding: EdgeInsets.all(20.0),
              child: TextField(
                decoration: InputDecoration(
                  labelText: '多行文本',
                  hintText: '请输入内容',
                  border: UnderlineInputBorder(
                    borderSide: BorderSide(color: Colors.blue),
                  ),
                ),
                maxLines: null,
                keyboardType: TextInputType.multiline,
                onChanged: (value) {
                  // 处理文本变化事件
                },
              ),
            ),
          ),
        ),
        onPhoneShake: () {
          // 手机摇动事件回调
          // 在这里执行颤动效果的操作，例如改变输入框的边框颜色
        },
      ),
    );
  }
}