Flutter 125: 图解自传 ACE_ICON.ttf 图标库

    小菜在学习过程中通常会需要大量的小图标，而多数的 Icon 都是经过设计同学优化过的，而如何采用类似系统 Icons 方式，此时可以通过自传类似字体库的 ttf 图标库的方式来完成；

ACE_ICON

    小菜推荐两个网站可以用来生成图标库；

• https://www.fluttericon.com/
• https://www.iconfont.cn/

1. 生成 ACE_ICON.ttf 图标库

    小菜以 https://www.fluttericon.com/ 为例来生成图标库；在这个图标库中有很多成套的图标，在这里可以选中需要的图标，也可以将本地生成的 .svg 文件拖拽进库中；

    其中设置完图标库名称后，通过工具选择下载不同的文件，包括 ttf 图标库、config 配置文件以及 mapping 映射文件；

2. 集成 ttf 图标库

• 将 ACE_ICON.ttf 库文件添加到 project 资源文件中；

• 在 pubspec.yaml 文件中声明 ACE_ICON.tt 文件库；声明方式与字体库等一致，注意 family 与 font 名称一致；在此可以声明引入多个资源库文件；之后 pub get 即可；

fonts:
  - family: DancingScript
    fonts:
      - asset: assets/DancingScript-Regular.ttf
  - family: ACE_ICON
    fonts:
      - asset: images/ACE_ICON.ttf

• 将 mapping 文件添加到 project 中，用于映射 ACE_ICON 图标库中各 Icons 文件；

class ACE_ICON {
  ACE_ICON._();

  static const _kFontFam = 'ACE_ICON';
  static const String _kFontPkg = null;

  static const IconData emo_happy = IconData(0xe800, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData emo_wink = IconData(0xe801, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData emo_unhappy = IconData(0xe802, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData emo_sleep = IconData(0xe803, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData emo_thumbsup = IconData(0xe804, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData emo_devil = IconData(0xe805, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData emo_surprised = IconData(0xe806, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData emo_tongue = IconData(0xe807, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData emo_coffee = IconData(0xe808, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData emo_sunglasses = IconData(0xe809, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData emo_displeased = IconData(0xe80a, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData emo_beer = IconData(0xe80b, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData emo_grin = IconData(0xe80c, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData emo_angry = IconData(0xe80d, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData emo_saint = IconData(0xe80e, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData emo_cry = IconData(0xe80f, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData emo_shoot = IconData(0xe810, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData emo_squint = IconData(0xe811, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData emo_laugh = IconData(0xe812, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData emo_wink2 = IconData(0xe813, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData book_story = IconData(0xe814, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData book_type = IconData(0xe815, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData book_user = IconData(0xe816, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData crown = IconData(0xe844, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData crown_plus = IconData(0xe845, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData crown_minus = IconData(0xe846, fontFamily: _kFontFam, fontPackage: _kFontPkg);
}

3. 图标库 IconData

    集成之后，使用方式与默认的 Icon 一致，直接获取 IconData 即可，对于 Icon 的颜色尺寸等其他绘制也不会有影响；

List aceIconData = [
  ACE_ICON.book_story, ACE_ICON.book_type, ACE_ICON.book_user, ACE_ICON.crown,
  ACE_ICON.crown_minus, ACE_ICON.crown_plus, ACE_ICON.emo_angry, ACE_ICON.emo_beer,
  ACE_ICON.emo_coffee, ACE_ICON.emo_cry, ACE_ICON.emo_devil, ACE_ICON.emo_displeased,
  ACE_ICON.emo_grin, ACE_ICON.emo_happy, ACE_ICON.emo_laugh, ACE_ICON.emo_saint,
  ACE_ICON.emo_shoot, ACE_ICON.emo_sleep, ACE_ICON.emo_squint, ACE_ICON.emo_sunglasses,
  ACE_ICON.emo_surprised, ACE_ICON.emo_thumbsup, ACE_ICON.emo_tongue, 
  ACE_ICON.emo_unhappy, ACE_ICON.emo_wink, ACE_ICON.emo_wink2
];

return SliverPadding(
    padding: const EdgeInsets.all(8.0),
    sliver: SliverGrid(
        gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
            crossAxisCount: 6, mainAxisSpacing: 8.0, crossAxisSpacing: 8.0, childAspectRatio: 1.0),
        delegate: SliverChildBuilderDelegate(
            (context, index) => Container(
                decoration: BoxDecoration(color: Colors.grey.withOpacity(0.2), borderRadius: BorderRadius.circular(3.0)),
                child: Center(child: Icon(dataList[index], color: Colors.blue.withOpacity(0.6)))),
            childCount: dataList.length)));

4. 异常注意

    小菜在测试过程中，会显示如下图所示，Icon 资源展示不出来，其原因是小菜在 pubspec.yaml 文件声明时换行空格导致的，注意在引入所有资源库文件时，都应严格遵守 pubspec.yaml 声明格式；

    ACE_ICON.ttf 案例源码

    小菜此次仅是对于日常资源库和命令行的简单应用，熟能生巧，仅限于日常积累；如有错误，请多多指导！

来源： 阿策小和尚