TextField聚焦时触发的Flutter TextEditingController listener

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  final TextEditingController _controller = TextEditingController();

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('TextField Listener Example'),
        ),
        body: Center(
          child: TextField(
            controller: _controller,
            decoration: InputDecoration(
              hintText: 'Enter text',
            ),
            onChanged: (text) {
              // 监听文本变化
              print('Text changed: $text');
            },
            onTap: () {
              // 监听点击事件
              print('TextField tapped');
            },
            onEditingComplete: () {
              // 监听编辑完成事件
              print('Editing complete');
            },
            focusNode: FocusNode(),
          ),
        ),
      ),
    );
  }
}