Center 居中布局

main.dart

import "package:flutter/material.dart";

void main() {
  runApp(
    MaterialApp(
      title: "Center 居中布局示例",
      home: LayoutDemo(),
    ),
  );
}

class LayoutDemo extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Center 居中布局示例'),
      ),
      body: Center(
        child: Text(
          "Hello World",
          style: TextStyle(
            fontSize: 36.0,
          ),
        ),
      ),
    );
  }
}