Flutter唯一标识符插件nuid的使用

dart-nuid 是一个用于生成唯一标识符（NUID）的 Dart 语言实现，受 NATS 启发。它比 UUID 更快、更轻量，并且仅包含数字和大写字母（即基于36进制）。本文将介绍如何在 Flutter 应用中使用 nuid 插件。

安装插件

首先，在你的 pubspec.yaml 文件中添加 nuid 依赖：

dependencies:
  flutter:
    sdk: flutter
  nuid: ^1.0.0  # 请根据最新版本号进行调整

然后运行以下命令安装依赖：

flutter pub get

使用示例

下面是一个完整的示例代码，展示了如何在 Flutter 应用中使用 nuid 生成唯一的标识符。

示例代码

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

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

class MyApp extends StatelessWidget {
  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter NUID Example',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: NuidExample(),
    );
  }
}

class NuidExample extends StatefulWidget {
  [@override](/user/override)
  _NuidExampleState createState() => _NuidExampleState();
}

class _NuidExampleState extends State<NuidExample> {
  final Nuid _nuid = Nuid.instance;
  List<String> _stringNuids = [];
  List<List<int>> _bytesNuids = [];

  void _generateNuids() {
    setState(() {
      _stringNuids.clear();
      _bytesNuids.clear();

      print('String:');
      print('  First nuid:');
      for (var i = 0; i < 4; i++) {
        var newNuid = _nuid.next();
        _stringNuids.add(newNuid);
        print('  - $newNuid');
      }

      print('  Reseting nuid:');
      _nuid.reset();

      for (var i = 0; i < 4; i++) {
        var newNuid = _nuid.next();
        _stringNuids.add(newNuid);
        print('  - $newNuid');
      }

      print('\nBytes:');
      print('  First nuid:');
      for (var i = 0; i < 4; i++) {
        var newNuidBytes = _nuid.nextBytes();
        _bytesNuids.add(newNuidBytes);
        print('  - $newNuidBytes');
      }

      print('  Reseting nuid:');
      _nuid.reset();

      for (var i = 0; i < 4; i++) {
        var newNuidBytes = _nuid.nextBytes();
        _bytesNuids.add(newNuidBytes);
        print('  - $newNuidBytes');
      }
    });
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('NUID Generator'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            ElevatedButton(
              onPressed: _generateNuids,
              child: Text('Generate NUIDs'),
            ),
            SizedBox(height: 20),
            Expanded(
              child: ListView.builder(
                itemCount: _stringNuids.length + _bytesNuids.length,
                itemBuilder: (context, index) {
                  if (index < _stringNuids.length) {
                    return ListTile(
                      title: Text('String NUID ${index + 1}: ${_stringNuids[index]}'),
                    );
                  } else {
                    var bytesIndex = index - _stringNuids.length;
                    return ListTile(
                      title: Text('Bytes NUID ${bytesIndex + 1}: ${_bytesNuids[bytesIndex].toString()}'),
                    );
                  }
                },
              ),
            ),
          ],
        ),
      ),
    );
  }
}