【Flutter】Icons 组件 ( FlutterIcon 下载图标 | 自定义 svg 图标生成 ttf 字体文件 | 使用下载的 ttf 图标文件 )

韩曙亮

发布于 2023-03-29 09:03:28

2.2K0

发布于 2023-03-29 09:03:28

文章被收录于专栏：韩曙亮的移动开发专栏

文章目录

一、FlutterIcon 下载图标

https://www.fluttericon.com/ 可以根据需求挑选合适的 icon 图标 , 生成 ttf 文件 ;

下图中 , 选中需要生成 ttf 字体文件的图标 , 这里选中了前

10 个图标 , 然后点击右上角的 DOWNLOAD 按钮 , 该网站会在后台将这

10 个图标的 SVG 文件打包到 ttf 文件中 ,

下载的文件是 flutter-icons-5b92b65c.zip , 后面一串是随机生成的数字 ;

该压缩包中主要有三个文件 ,

① ttf 字体文件 : MyFlutterApp.ttf , svg 格式的图标就封装在该文件中 ;

② dart 文件 : Flutter 中使用 ttf 图标的参考 ,

/// Flutter icons MyFlutterApp
/// Copyright (C) 2021 by original authors @ fluttericon.com, fontello.com
/// This font was generated by FlutterIcon.com, which is derived from Fontello.
///
/// To use this font, place it in your fonts/ directory and include the
/// following in your pubspec.yaml
///
/// flutter:
///   fonts:
///    - family:  MyFlutterApp
///      fonts:
///       - asset: fonts/MyFlutterApp.ttf
///
/// 
/// * Material Design Icons, Copyright (C) Google, Inc
///         Author:    Google
///         License:   Apache 2.0 (https://www.apache.org/licenses/LICENSE-2.0)
///         Homepage:  https://design.google.com/icons/
///
import 'package:flutter/widgets.dart';

class MyFlutterApp {
  MyFlutterApp._();

  static const _kFontFam = 'MyFlutterApp';
  static const String? _kFontPkg = null;

  static const IconData threedee_rotation = IconData(0xe855, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData ac_unit = IconData(0xe856, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData access_alarm = IconData(0xe857, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData access_alarms = IconData(0xe858, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData access_time = IconData(0xe859, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData accessibility = IconData(0xe85a, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData accessible = IconData(0xe85b, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData account_balance = IconData(0xe85c, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData account_box = IconData(0xe85d, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData account_balance_wallet = IconData(0xf008, fontFamily: _kFontFam, fontPackage: _kFontPkg);
}

③ json 配置文件 : 这个看起来是给前端开发使用的 ;

{
  "name": "",
  "css_prefix_text": "",
  "css_use_suffix": false,
  "hinting": true,
  "units_per_em": 1000,
  "ascent": 850,
  "glyphs": [
    {
      "uid": "2cc10cdba83708a30142016d40519bb9",
      "css": "threedee_rotation",
      "code": 59477,
      "src": "material"
    },
    {
      "uid": "6a105ad156427b024b633a799e03af7b",
      "css": "ac_unit",
      "code": 59478,
      "src": "material"
    },
    {
      "uid": "9548f8adbc5e7b2dc94633be2821cd1f",
      "css": "access_alarm",
      "code": 59479,
      "src": "material"
    },
    {
      "uid": "2b1bcd8b15d35599f6828e4f5eadfa30",
      "css": "access_alarms",
      "code": 59480,
      "src": "material"
    },
    {
      "uid": "82f44f1094ffd1d78093e76c33cc08cc",
      "css": "access_time",
      "code": 59481,
      "src": "material"
    },
    {
      "uid": "ad65fa7f0f35e80fe1f1a5afadbc561f",
      "css": "accessibility",
      "code": 59482,
      "src": "material"
    },
    {
      "uid": "74bc3a2d72aec992ff1e08cfdd986b38",
      "css": "accessible",
      "code": 59483,
      "src": "material"
    },
    {
      "uid": "5da59f89dd294fa4475a7cdbe3cd3145",
      "css": "account_balance",
      "code": 59484,
      "src": "material"
    },
    {
      "uid": "cdd836ec082da15e51545f2ea1a37015",
      "css": "account_balance_wallet",
      "code": 61448,
      "src": "material"
    },
    {
      "uid": "58f376c8c60c911e8cd5a65becb0d932",
      "css": "account_box",
      "code": 59485,
      "src": "material"
    }
  ]
}

二、自定义 svg 图标生成 ttf 字体文件

https://www.fluttericon.com/ 中 , 将 SVG 格式的图标拖动到该地址页面的 Custom Icons 区域 ,

拖动过程 :

拖动完成后 , 页面中的 Custom Icons 区域会显示这 20 个 SVG 图标 ;

选中这些图标 , 点击 DOWNLOAD 按钮 , 即可下载生成的 ttf 格式的文件 ;

三、使用下载的 ttf 图标文件

将 MyFlutterApp.ttf 字体文件拷贝到 Flutter 源码根目录下的 fonts 目录下 ,

在 pubspec.yaml 配置文件中配置字体文件 ,

name: flutter_image_widget
description: A new Flutter application.

version: 1.0.0+1

environment:
  sdk: ">=2.1.0 <3.0.0"

dependencies:
  flutter:
    sdk: flutter

  cupertino_icons: ^0.1.2
  path_provider: ^2.0.1
  transparent_image: ^2.0.0
  cached_network_image: ^2.5.1

dev_dependencies:
  flutter_test:
    sdk: flutter


flutter:
  uses-material-design: true

  assets:
    - images/sidalin.png
    - images/sidalin2.png
    - images/waiting.gif

  fonts:
    - family:  MyFlutterApp
      fonts:
        - asset: fonts/MyFlutterApp.ttf

参考下载时给的示例代码 , 里面有每个图标对应的 16 进制的 Unicode 编码 , 3D 图标对应的编码是 0xe855 ;

import 'package:flutter/widgets.dart';

class MyFlutterApp {
  MyFlutterApp._();

  static const _kFontFam = 'MyFlutterApp';
  static const String? _kFontPkg = null;

  static const IconData threedee_rotation = IconData(0xe855, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData ac_unit = IconData(0xe856, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData access_alarm = IconData(0xe857, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData access_alarms = IconData(0xe858, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData access_time = IconData(0xe859, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData accessibility = IconData(0xe85a, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData accessible = IconData(0xe85b, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData account_balance = IconData(0xe85c, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData account_box = IconData(0xe85d, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData account_balance_wallet = IconData(0xf008, fontFamily: _kFontFam, fontPackage: _kFontPkg);
}

IconData 构造函数参数说明 :

codePoint : 字体中的图标对应的十六进制 Unicode ;
fontFamily : pubspec.yaml 中配置的 fontFamily ;
fontPackage : 字体所在的包 , 默认不填 ;
matchTextDirection : 图标绘制方向 , 是否按照 svg 文件中的方向绘制 ;

代码中使用 IconData 加载自定义图标 , 3D图标对应的编码是 0xe855 ;

Center(
  // 加载自定义图标
  child: Icon(IconData(0xe855, fontFamily: "MyFlutterApp",), size: 200,),
),

运行效果 : 第一个图标就是加载的自定义图标 ;

四、完整代码示例

完整代码示例 :

import 'package:flutter/material.dart';
import 'dart:io';
import 'package:path_provider/path_provider.dart';
import 'package:transparent_image/transparent_image.dart';
import 'package:cached_network_image/cached_network_image.dart';

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

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);
  final String title;

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

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  /// SD 卡路径
  String sdPath;

  @override
  void initState() {
    // 获取 SD 卡路径
    getSdPath();
  }

  void getSdPath() async {
    String path = (await getExternalStorageDirectory()).path;
    setState(() {
      sdPath = path;
    });
  }

  
  @override
  Widget build(BuildContext context) {
    print("sdPath : $sdPath");
    
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: ListView(
          children: [


            Center(
              // 加载自定义图标
              child: Icon(IconData(0xe855, fontFamily: "MyFlutterApp",), size: 150,),
            ),

            Center(
              // 加载 Flutter 内置图标
              child: Icon(Icons.threed_rotation, size: 200,),
            ),


            Stack(
              children: [
                Center(
                  // 网络加载时显示本地的资源图片
                  child: FadeInImage.assetNetwork(
                    // Placeholder
                    placeholder: "images/waiting.gif",
                    image: "https://img-blog.csdnimg.cn/20210324110914742.png",
                  ),
                )
              ],
            ),


            Stack(
              children: [
                // 进度条
                Center(child: CircularProgressIndicator(),),
                Center(
                  // 网络加载时渐变出现
                  child: FadeInImage.memoryNetwork(
                    // Placeholder
                    placeholder: kTransparentImage,
                    image: "https://img-blog.csdnimg.cn/2021032321394771.png",
                  ),
                )
              ],
            ),


            Center(
              // 图片加载完成之前显示的是 placeholder , 加载完成后显示网络图片
              child: CachedNetworkImage(
                // 加载网络图片过程中显示的内容 , 这里显示进度条
                placeholder: (context, url)=>CircularProgressIndicator(),
                // 网络图片地址
                imageUrl: "https://img-blog.csdnimg.cn/20210324100419204.png",
              ),
            ),




            // 图片组件 , 从网络中加载一张图片
            Image.network(
              // 图片地址
              "https://img-blog.csdnimg.cn/2021032313493741.png",
            ),

            Image(
              image: AssetImage("images/sidalin.png"),
            ),

            //Image.asset('images/sidalin2.png', ),

            /// 从 SD 卡加载图片
            if(sdPath != null)
              Image.file(
                File('$sdPath/sidalin3.png'),
                width: 200,
              ),
          ],
        )

      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}

运行效果展示 :

五、相关资源

参考资料 :

Flutter 官网 : https://flutter.dev/
Flutter 插件下载地址 : https://pub.dev/packages
Flutter 开发文档 : https://flutter.cn/docs ( 强烈推荐 )
官方 GitHub 地址 : https://github.com/flutter
Flutter 中文社区 : https://flutter.cn/
Flutter 实用教程 : https://flutter.cn/docs/cookbook
Flutter CodeLab : https://codelabs.flutter-io.cn/
Dart 中文文档 : https://dart.cn/
Dart 开发者官网 : https://api.dart.dev/
Flutter 中文网 ( 非官方 , 翻译的很好 ) : https://flutterchina.club/ , http://flutter.axuer.com/docs/
Flutter 相关问题 : https://flutterchina.club/faq/ ( 入门阶段推荐看一遍 )
GitHub 上的 Flutter 开源示例 : https://download.csdn.net/download/han1202012/15989510

博客源码下载 :

GitHub 地址 : https://github.com/han1202012/flutter_image_widget ( 随博客进度一直更新 , 有可能没有本博客的源码 )
博客源码快照 : https://download.csdn.net/download/han1202012/16083326 ( 本篇博客的源码快照 , 可以找到本博客的源码 )

本文参与腾讯云自媒体同步曝光计划，分享自作者个人站点/博客。

原始发表：2021-03-24，如有侵权请联系 cloudcommunity@tencent.com 删除

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