Flutter主题Theme

Flutter：Theme
https://www.jianshu.com/p/059c5794b29c

Flutter进阶—自定义主题风格
https://blog.csdn.net/hekaiyou/article/details/76533014

主题的使用：

import 'package:flutter/material.dart';
import 'package:flutter/foundation.dart';

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

// iOS主题
final ThemeData kIOSTheme = new ThemeData(
  primarySwatch: Colors.orange,
  primaryColor: Colors.grey[100],
  accentColor: Colors.green,
  primaryColorBrightness: Brightness.light,
);

// 默认主题
final ThemeData kDefaultTheme = new ThemeData(
  primarySwatch: Colors.purple,
  accentColor: Colors.orangeAccent[400],
);

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return MaterialApp(
      title: 'My app',
      theme: defaultTargetPlatform == TargetPlatform.iOS
          ? kIOSTheme : kDefaultTheme,
      home: new MyHomePage(),
      debugShowCheckedModeBanner: false,
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key}) : super(key: key);

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

class _MyHomePageState extends State<MyHomePage> {

  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: AppBar(
        title: Text('我是title'),
      ),
      body: new Center(
        child: new Container(
          color: Theme.of(context).accentColor,
          child: new Text(
            'Text with a background color',
            style: Theme.of(context).textTheme.title,
          ),
        ),
      ),
      floatingActionButton: new Theme(
        data: Theme.of(context).copyWith(accentColor: Colors.yellow),
        child: new FloatingActionButton(
          onPressed: null,
          child: new Icon(Icons.add),
        ),
      ),
    );
  }
}

效果：

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