您可以使用 ShaderMask
您可以在下面运行完整代码
代码sn-p
Tab(icon: ShaderMask(
blendMode: BlendMode.srcIn,
shaderCallback: (Rect bounds) {
return ui.Gradient.linear(
Offset(4.0, 24.0),
Offset(24.0, 4.0),
[
Colors.blue[200],
Colors.greenAccent,
],
);
},
child: Icon(Icons.search)))
完整代码
import 'package:flutter/material.dart';
import 'dart:ui' as ui;
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
// This is the theme of your application.
//
// Try running your application with "flutter run". You'll see the
// application has a blue toolbar. Then, without quitting the app, try
// changing the primarySwatch below to Colors.green and then invoke
// "hot reload" (press "r" in the console where you ran "flutter run",
// or simply save your changes to "hot reload" in a Flutter IDE).
// Notice that the counter didn't reset back to zero; the application
// is not restarted.
primarySwatch: Colors.blue,
),
home: TabBarDemo(),
);
}
}
class TabBarDemo extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: DefaultTabController(
length: 3,
child: Scaffold(
appBar: AppBar(
bottom: TabBar(
tabs: [
Tab(icon: ShaderMask(
blendMode: BlendMode.srcIn,
shaderCallback: (Rect bounds) {
return ui.Gradient.linear(
Offset(4.0, 24.0),
Offset(24.0, 4.0),
[
Colors.blue[200],
Colors.greenAccent,
],
);
},
child: Icon(Icons.search))),
Tab(icon: ShaderMask(
blendMode: BlendMode.srcIn,
shaderCallback: (Rect bounds) {
return ui.Gradient.linear(
Offset(4.0, 24.0),
Offset(24.0, 4.0),
[
Colors.blue[200],
Colors.greenAccent,
],
);
},
child: Icon(Icons.star))),
Tab(icon: ShaderMask(
blendMode: BlendMode.srcIn,
shaderCallback: (Rect bounds) {
return ui.Gradient.linear(
Offset(4.0, 24.0),
Offset(24.0, 4.0),
[
Colors.blue[200],
Colors.greenAccent,
],
);
},
child: Icon(Icons.account_circle))),
],
),
title: Text('Tabs Demo'),
),
body: TabBarView(
children: [
Icon(Icons.directions_car),
Icon(Icons.directions_transit),
Icon(Icons.directions_bike),
],
),
),
),
);
}
}