Flutter:如何在Flutter中添加浮动文本标签？

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('Floating Text Labels'),
        ),
        body: Center(
          child: Stack(
            children: [
              Positioned(
                top: 50,
                left: 20,
                child: Container(
                  padding: EdgeInsets.all(8),
                  color: Colors.blue,
                  child: Text(
                    'Label 1',
                    style: TextStyle(
                      color: Colors.white,
                      fontSize: 16,
                    ),
                  ),
                ),
              ),
              Positioned(
                top: 100,
                left: 80,
                child: Container(
                  padding: EdgeInsets.all(8),
                  color: Colors.green,
                  child: Text(
                    'Label 2',
                    style: TextStyle(
                      color: Colors.white,
                      fontSize: 16,
                    ),
                  ),
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }
}