Flutter加密字体图标插件crypto_font_icons的使用

概述

crypto_font_icons 是一个将 AMPoellmann’s CryptoFont 引入 Flutter 的库。该库已经升级以支持 Flutter 的新空安全特性。

安装

在你的 pubspec.yaml 文件的 dependencies: 部分添加以下行：

crypto_font_icons: 1.0.0+1

然后运行 flutter pub get 来安装依赖。

使用

基本用法

以下是一个简单的示例，展示如何在 Flutter 应用中使用 crypto_font_icons 插件来显示比特币图标：

import 'package:flutter/material.dart';
import 'package:crypto_font_icons/crypto_font_icons.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('CryptoFont Icons Example'),
        ),
        body: Center(
          child: IconButton(
            icon: Icon(CryptoFontIcons.BTC),
            onPressed: () {
              // 处理按钮点击事件
            },
          ),
        ),
      ),
    );
  }
}

更复杂的示例

以下是一个更复杂的示例，展示了一个包含搜索功能的图标画廊应用。用户可以搜索并查看不同的加密货币图标。

import 'package:flutter/material.dart';
import 'package:crypto_font_icons/crypto_font_icons.dart';

void main() {
  runApp(CryptoFontGalleryApp());
}

class CryptoFontGalleryApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'CryptoFont Flutter Gallery',
      theme: ThemeData.light().copyWith(
        iconTheme: IconThemeData(size: 36.0, color: Colors.black87),
        textTheme: TextTheme(
          bodyText1: TextStyle(fontSize: 16.0, color: Colors.black87),
        ),
      ),
      home: CryptoFontGalleryHome(),
    );
  }
}

class CryptoFontGalleryHome extends StatefulWidget {
  @override
  State<StatefulWidget> createState() => CryptoFontGalleryHomeState();
}

class CryptoFontGalleryHomeState extends State<CryptoFontGalleryHome> {
  var _searchTerm = "";
  var _isSearching = false;

  @override
  Widget build(BuildContext context) {
    final filteredIcons = CryptoFontIcons.icons
        .where((icon) => _searchTerm.isEmpty || icon.title.toLowerCase().contains(_searchTerm.toLowerCase()))
        .toList();
    final orientation = MediaQuery.of(context).orientation;

    return Scaffold(
      appBar: _isSearching ? _searchBar(context) : _titleBar(),
      body: GridView.builder(
        itemCount: filteredIcons.length,
        gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
          crossAxisCount: orientation == Orientation.portrait ? 2 : 3,
        ),
        itemBuilder: (context, index) {
          final icon = filteredIcons[index];

          return InkWell(
            onTap: () {
              Navigator.push(
                context,
                MaterialPageRoute<Null>(
                  builder: (BuildContext context) {
                    return GestureDetector(
                      onTap: () {
                        Navigator.of(context).pop();
                      },
                      child: Container(
                        color: Colors.white,
                        child: SizedBox.expand(
                          child: Hero(
                            tag: icon,
                            child: Icon(
                              icon.iconData,
                              size: 100.0,
                            ),
                          ),
                        ),
                      ),
                    );
                  },
                ),
              );
            },
            child: Column(
              mainAxisAlignment: MainAxisAlignment.center,
              children: <Widget>[
                Hero(tag: icon, child: Icon(icon.iconData)),
                Container(
                  padding: EdgeInsets.only(top: 16.0),
                  child: Text(icon.title),
                )
              ],
            ),
          );
        },
      ),
    );
  }

  AppBar _titleBar() {
    return AppBar(
      title: Text("CryptoFont Flutter Gallery"),
      actions: [
        IconButton(
          icon: Icon(Icons.search),
          onPressed: () {
            ModalRoute.of(context)?.addLocalHistoryEntry(
              LocalHistoryEntry(
                onRemove: () {
                  setState(() {
                    _searchTerm = "";
                    _isSearching = false;
                  });
                },
              ),
            );

            setState(() {
              _isSearching = true;
            });
          },
        )
      ],
    );
  }

  AppBar _searchBar(BuildContext context) {
    return AppBar(
      leading: IconButton(
        icon: Icon(Icons.arrow_back),
        onPressed: () {
          setState(
            () {
              Navigator.pop(context);
              _isSearching = false;
              _searchTerm = "";
            },
          );
        },
      ),
      title: TextField(
        onChanged: (text) => setState(() => _searchTerm = text),
        autofocus: true,
        style: TextStyle(fontSize: 18.0),
        decoration: InputDecoration(border: InputBorder.none),
      ),
    );
  }
}

归属

CryptoFont 由 @AMPoellmann 开发 - https://cryptofont.com
https://github.com/AlexanderPoellmann/CryptoFont

希望这些信息对你有帮助！如果你有任何问题或需要进一步的帮助，请随时提问。