将SingleChildScrollView中的内容垂直居中，最小屏幕高度

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        body: Center(
          child: Container(
            height: MediaQuery.of(context).size.height,
            child: SingleChildScrollView(
              child: Column(
                mainAxisAlignment: MainAxisAlignment.center,
                children: <Widget>[
                  Container(
                    height: 200,
                    color: Colors.blue,
                    child: Center(child: Text('Centered Content')),
                  ),
                  // Add more widgets here as needed
                ],
              ),
            ),
          ),
        ),
      ),
    );
  }
}