Flutter非付费功能验证插件flutter_not_paid的使用

插件简介

Flutter Not Paid 是一个用于在客户端未支付的情况下逐渐减少应用透明度，直到应用完全消失的插件。你可以设置一个截止日期，并自定义天数，直到网站或应用完全消失。

安装

要使用 flutter_not_paid 插件，首先需要在 pubspec.yaml 文件中添加依赖项：

dependencies:
  flutter_not_paid: <latest_version>

请将 <latest_version> 替换为最新版本号。你可以在 Pub.dev 上查看最新的版本信息。

使用方法

以下是一个完整的示例代码，展示了如何在项目中使用 flutter_not_paid 插件。

示例代码

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

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return NotPaid(
      // 设置截止日期，距离现在6天前
      dueDate: DateTime.now().subtract(Duration(days: 6)),
      // 设置透明度减少的天数
      deadline: 8,
      // 是否显示横幅，默认为true
      showBanner: true,
      // 子组件，这里是MaterialApp
      child: MaterialApp(
        title: 'Flutter Not Paid Demo',
        theme: ThemeData(
          primarySwatch: Colors.blue,
        ),
        home: MyHomePage(title: 'Flutter Not Paid 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() {
    print('button clicked');
    setState(() {
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headline4,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ),
    );
  }
}

代码说明

• NotPaid：这是 flutter_not_paid 插件的主要组件，它包裹了你的应用，并根据设置的截止日期和天数逐渐减少应用的透明度。
  • dueDate：设置截止日期，表示从该日期开始计算透明度减少的时间。
  • deadline：设置透明度减少的总天数。例如，如果设置为8天，那么应用将在8天后完全消失。
  • showBanner：是否显示顶部横幅，默认为 true。这个横幅会提示用户“Client did not pay”。
  • child：这是你应用的实际内容，通常是一个 MaterialApp 或 CupertinoApp。

运行效果

当应用启动时，NotPaid 组件会根据设置的 dueDate 和 deadline 来逐渐减少应用的透明度。如果你设置了 showBanner 为 true，则会在应用顶部显示一个横幅，提示“Client did not pay”。

特性和问题反馈

如果你有任何功能请求或遇到问题，可以在 GitHub Issues 中提交。

许可证

Flutter Not Paid 采用 BSD 3-Clause License 许可证，具体内容如下：

BSD 3-Clause License

Copyright (c) 2021, Birju Vachhani
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this
   list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

3. Neither the name of the copyright holder nor the names of its
   contributors may be used to endorse or promote products derived from
   this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.