Flutter将文本字段光标设置为在更改控制器文本时启动

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('Flutter Text Field Cursor'),
        ),
        body: Center(
          child: TextField(
            controller: _controller,
            onChanged: (text) {
              // 设置光标位置为文本末尾
              _controller.selection = TextSelection.fromPosition(
                TextPosition(offset: _controller.text.length),
              );
            },
          ),
        ),
      ),
    );
  }
}