Flutter自定义字体不变

Question

我尝试为我的AppBar使用自定义字体，但他不会改变。我尝试使用两种不同的字体，即RobotoMono和DancingScript，但没有任何变化，该应用程序不会更改字体。我也尝试从虚拟电话上取消安装该应用程序，也创建了另一个虚拟设备，但是什么也没有。那是我的main.dart：

import 'package:flutter/material.dart';
import 'background_image_task-9.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Blumax',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        fontFamily: 'Dancing', 
        primarySwatch: myColour
      ),
      home: BackgroundImage(
        ),
    );
  }
}

const MaterialColor myColour = const MaterialColor(
  0xFF0009FF,
  const <int, Color>{
    50: const Color(0xFF0009FF),
    100: const Color(0xFF0009FF),
    200: const Color(0xFF0009FF),
    300: const Color(0xFF0009FF),
    400: const Color(0xFF0009FF),
    500: const Color(0xFF0009FF),
    600: const Color(0xFF0009FF),
    700: const Color(0xFF0009FF),
    800: const Color(0xFF0009FF),
    900: const Color(0xFF0009FF),
  },
);

这是我使用自定义字体background_image_task-9.dart的位置：

import 'package:flutter/material.dart';

class BackgroundImage extends StatelessWidget{
    @override
    Widget build(BuildContext context){
      return Scaffold(
        appBar: AppBar(
          elevation: 0,
          title: Text('Blumax', style: TextStyle(
            fontWeight: FontWeight.w500,
            fontFamily: 'RobotoMono',
            fontSize: 40
          ),),
          centerTitle: true,
        ),
        body: Container(
          decoration: BoxDecoration(
            image: DecorationImage(image: AssetImage("assets/blumax.jpg"), fit: BoxFit.cover),
          ),
        ),
    );
  }
}

这就是我的pubspec.yaml：

name: iphone_prj
description: A new Flutter project.

# The following defines the version and build number for your application.
# A version number is three numbers separated by dots, like 1.2.43
# followed by an optional build number separated by a +.
# Both the version and the builder number may be overridden in flutter
# build by specifying --build-name and --build-number, respectively.
# In Android, build-name is used as versionName while build-number used as versionCode.
# Read more about Android versioning at https://developer.android.com/studio/publish/versioning
# In iOS, build-name is used as CFBundleShortVersionString while build-number used as CFBundleVersion.
# Read more about iOS versioning at
# https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
version: 1.0.0+1

environment:
  sdk: ">=2.1.0 <3.0.0"

dependencies:
  flutter:
    sdk: flutter
  english_words: ^3.1.0

  # The following adds the Cupertino Icons font to your application.
  # Use with the CupertinoIcons class for iOS style icons.
  cupertino_icons: ^0.1.2

dev_dependencies:
  flutter_test:
    sdk: flutter


# For information on the generic Dart part of this file, see the
# following page: https://dart.dev/tools/pub/pubspec

# The following section is specific to Flutter.
flutter:
  assets:
    - assets/

  # The following line ensures that the Material Icons font is
  # included with your application, so that you can use the icons in
  # the material Icons class.
  uses-material-design: true
fonts:
  - family: RobotoMono
    fonts:
      - asset: assets/fonts/RobotoMono-Bold.ttf
  - family: DancingScript
    fonts:
      - asset: assets/fonts/DancingScript-Bold.ttf
        weight: 300

  # To add assets to your application, add an assets section, like this:
  # assets:
  #  - images/a_dot_burr.jpeg
  #  - images/a_dot_ham.jpeg

  # An image asset can refer to one or more resolution-specific "variants", see
  # https://flutter.dev/assets-and-images/#resolution-aware.

  # For details regarding adding assets from package dependencies, see
  # https://flutter.dev/assets-and-images/#from-packages


  # To add custom fonts to your application, add a fonts section here,
  # in this "flutter" section. Each entry in this list should have a
  # "family" key with the font family name, and a "fonts" key with a
  # list giving the asset and other descriptors for the font. For
  # example:
  # fonts:
  #   - family: Schyler
  #     fonts:
  #       - asset: fonts/Schyler-Regular.ttf
  #       - asset: fonts/Schyler-Italic.ttf
  #         style: italic
  #   - family: Trajan Pro
  #     fonts:
  #       - asset: fonts/TrajanPro.ttf
  #       - asset: fonts/TrajanPro_Bold.ttf
  #         weight: 700
  #
  # For details regarding fonts from package dependencies,
  # see https://flutter.dev/custom-fonts/#from-packages

Answer 1

您遇到的问题是您的字体系列名称为

DancingScript，并且在ThemeData中将其提供为

Dancing。因此它不会影响您的应用字体。
而且，在BackgroundImage类中，添加了RobotoMono
字体。但是，您添加的“ fontWeight：FontWeight.w500”与pubspec.yaml不匹配，因为您添加了
RobotoMono-Bold字体。因此，通过匹配您的字体名称和字体样式，将根据您的要求影响您的应用程序字体。