我正在尝试设置我的字体MaterialApp。由于我使用的是深色主题，所以我想使用copyWith然后更改fontFamily。然而，copyWith没有更改的选项fontFamily.
MaterialApp(
theme: ThemeData.dark().copyWith(
fontFamily: 'MyFontFamily',
),
未定义命名参数“fontFamily”。
如何保留深色主题并更改字体系列？ （同样的问题ThemeData.light().)
我找到了解决方案并在下面发布。
如果你看一下源代码 https://github.com/flutter/flutter/blob/master/packages/flutter/lib/src/material/theme_data.dart for ThemeData.light() and ThemeData.dark()，你可以看到它所做的只是设置brightness value:
/// A default light blue theme.
///
/// This theme does not contain text geometry. Instead, it is expected that
/// this theme is localized using text geometry using [ThemeData.localize].
factory ThemeData.light() => ThemeData(brightness: Brightness.light);
/// A default dark theme with a teal secondary [ColorScheme] color.
///
/// This theme does not contain text geometry. Instead, it is expected that
/// this theme is localized using text geometry using [ThemeData.localize].
factory ThemeData.dark() => ThemeData(brightness: Brightness.dark);
这意味着无需费心就能解决您的问题ThemeData.light() or ThemeData.dark()。只需创建一个新的ThemeData并设置brightness除了你自己fontFamily:
MaterialApp(
theme: ThemeData(
brightness: Brightness.dark,
fontFamily: 'MyFontFamily',
),
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