Flutter -在堆栈中显示隐藏小部件，而无需使用setState重新加载整个脚手架(像优步一样使用GoogleMap堆栈)

import 'package:flutter/material.dart';

class MyWidget extends StatelessWidget {
  bool isVisible = false;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Flutter Stack Example'),
      ),
      body: Center(
        child: Stack(
          children: <Widget>[
            // 可见的小部件
            Visibility(
              visible: isVisible,
              child: Container(
                width: 200,
                height: 200,
                color: Colors.blue,
              ),
            ),
            // 隐藏的小部件
            Visibility(
              visible: !isVisible,
              child: Container(
                width: 200,
                height: 200,
                color: Colors.red,
              ),
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          // 切换可见性
          isVisible = !isVisible;
        },
        child: Icon(Icons.visibility),
      ),
    );
  }
}