想對 Card 使用強調色，由于不推薦使用強調色，我使用 colorScheme 代替。在 MaterialApp 的 themeData 中描述了 colorScheme。但最終不能用于卡。顯示錯誤：“無法將引數型別‘ColorScheme’分配給引數型別‘Color’”
這是來自 MaterialApp 的 themeData
theme: ThemeData(
primarySwatch: Colors.green,
colorScheme: ColorScheme.fromSwatch().copyWith(secondary: Colors.red),
canvasColor: Color.fromRGBO(255, 245, 224, 1),
fontFamily: 'Raleway',
textTheme: ThemeData.light().textTheme.copyWith(
bodyText1: TextStyle(
color: Color.fromRGBO(23, 45, 23, 1),
),
bodyText2: TextStyle(
color: Color.fromRGBO(23, 45, 23, 1),
),
headline6: TextStyle(
fontSize: 20,
fontFamily: 'RobotoCondensed',
fontWeight: FontWeight.bold,
),
),
),
這是使用它的卡
Card(
child: Text(selectedMeal.ingredients[i]),
color: Theme.of(context).colorScheme,//error shows here
),
uj5u.com熱心網友回復：
colorScheme屬性是ColorScheme型別，而color需要一個Color型別。
ColorScheme 包含可以訪問的不同顏色，例如，如下所示：
color: Theme.of(context).colorScheme.secondary,
遵循一個完整的例子：
import 'package:flutter/material.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Demo',
theme: ThemeData(
primarySwatch: Colors.green,
colorScheme: ColorScheme.fromSwatch().copyWith(secondary: Colors.red),
canvasColor: const Color.fromRGBO(255, 245, 224, 1),
fontFamily: 'Raleway',
textTheme: ThemeData.light().textTheme.copyWith(
bodyText1: const TextStyle(
color: Color.fromRGBO(23, 45, 23, 1),
),
bodyText2: const TextStyle(
color: Color.fromRGBO(23, 45, 23, 1),
),
headline6: const TextStyle(
fontSize: 20,
fontFamily: 'RobotoCondensed',
fontWeight: FontWeight.bold,
),
),
),
home: const MyHomePage(),
);
}
}
class MyHomePage extends StatefulWidget {
const MyHomePage({Key? key}) : super(key: key);
@override
State<MyHomePage> createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
@override
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child: Card(
//child: Text(selectedMeal.ingredients[i]),
color: Theme.of(context).colorScheme.secondary,
),
),
);
}
}
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