Flutter中的透明粘性页脚

Question

我是following this Stack Overflow post，因为我制作了一个粘性页脚。页脚的表现与它需要的一样，但有没有办法增加透明度，以便页脚后面的列表中的项目可见？

实心页脚

透明页脚

这里是制作实心页脚的所有代码

import 'package:flutter/material.dart';

void main() => runApp(new MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      home: new MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage();

  @override
  _MyHomePageState createState() => new _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      body: new Column(
        children: <Widget>[
          new Expanded(
            child: new ListView.builder(
              itemCount: 200,
              itemBuilder: (context, index) {
                return new ListTile(
                  title: new Text("title $index"),
                );
              },
            ),
          ),
          new Container(
            height: 40.0,
            color: Colors.red,
          ),
        ],
      ),
    );
  }
}

Answer 1

您可以使用Stack 将小部件显示在彼此的顶部。

new Scaffold(
  body: new Stack(
    alignment: Alignment.bottomCenter,
    children: [
      new ListView(...),
      new Container(height: 40.0, color: Colors.red),
    ],
  ),
),