flutter之appbar阴影设置

flutter,显示出appbar我就不多说了,就讲下我项目实战中让appbar显示指定的阴影部分,这里采用的是container容器进行包装显示

1.原生设计阴影;

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return new MaterialApp(
      home: new Scaffold(
        body: new Column(
          crossAxisAlignment: CrossAxisAlignment.center,
          children: <Widget>[
            new AppBar(
              title: new Text('Hello world'), //设置标题
              elevation: 4.0,                 //设置阴影辐射范围
            )
          ],
        ),
      ),
    );
  }
}

2.改造后,自定义阴影

1.将 elevation:阴影辐射范围设置为0.0,
2.使用Container容器进行包裹

import 'package:flutter/material.dart';
import 'package:flutter_demo/widget/AppBarWight.dart';
void main() {
  runApp(new MyApp());
}
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return new MaterialApp(
      home: new Scaffold(
        body: new Column(
          crossAxisAlignment: CrossAxisAlignment.center,
          children: <Widget>[
            AppbarWig.hello_appbar(), //设计时内部不给范围
          ],
        ),
      ),
    );
  }
}

温馨提示: 两段代码间存在导包,及包目录问题,请自行创建

import 'package:flutter/material.dart';

class AppbarWig {
  static Widget hello_appbar() => new Container(
    child: new AppBar(
      title: new Text('hello'),
      centerTitle: true,
      actions: <Widget>[
        new Icon(Icons.add_circle),
      ],
      leading: Icon(Icons.account_box),
      elevation: 0,
    ),
    decoration: BoxDecoration(
      boxShadow: <BoxShadow>[
        BoxShadow(color: Colors.red, blurRadius: 30.0)
      ],
    ),
  );
}