flutter改变主题颜色

阳光穿透心脏的1/2处 2021-09-19 07:42 722阅读 0赞

/****
     * 
     * 改变主题颜色
     * 
     * 
     */
    
    import 'package:flutter/material.dart';
    
    void main()=>runApp(MyApp());
    class MyApp extends StatelessWidget {
      @override
      Widget build(BuildContext context){
        return MaterialApp(
          title: 'Flutter Demo',
          theme: ThemeData(
            primarySwatch: Colors.blue,
          ),
          home:ThemeTestRoute(),
        );
      }
    }
    
    class ThemeTestRoute extends StatefulWidget{
      @override
     _ThemeTestRouteState createState()=>new _ThemeTestRouteState();
      }
    
    class _ThemeTestRouteState extends State<ThemeTestRoute>{
      Color _themeColor = Colors.teal;//当前主题颜色
      @override 
      Widget build(BuildContext context) {
        ThemeData themeData = Theme.of(context);
        return Theme(
          data:ThemeData(
            primarySwatch: _themeColor,//用于导航栏。floatingActionButton
            iconTheme: IconThemeData(color: _themeColor)//用于icon颜色
          ),
          child: Scaffold(
            appBar: AppBar(title:Text('主题变色')),
            body: Column(
              mainAxisAlignment: MainAxisAlignment.center,
              children: <Widget>[
                //第一行Icon使用主题中的iconTheme
                Row(
                    mainAxisAlignment: MainAxisAlignment.center,
                    children: <Widget>[
                      Icon(Icons.favorite),
                      Text("  颜色跟随主题")
                    ]
                ),
                //为第二行Icon自定义颜色（固定为黑色)
                Theme(
                  data: themeData.copyWith(
                    iconTheme: themeData.iconTheme.copyWith(
                        color: Colors.black
                    ),
                  ),
                  child: Row(
                      mainAxisAlignment: MainAxisAlignment.center,
                      children: <Widget>[
                        Icon(Icons.favorite),
                        Text("  颜色固定黑色")
                      ]
                  ),
                ),
              ],
            ),
            floatingActionButton: FloatingActionButton(
              onPressed: ()=>//主题切换
              setState(()=>
              _themeColor =  _themeColor ==Colors.teal? Colors.blue:Colors.teal
    
              ),
              child: Icon(Icons.palette),
            ),
          ),
        );
      }
    }