Flutter应用被杀后推送通知插件 notification_when_app_is_killed 的使用

概述

notification_when_app_is_killed 插件允许在Flutter应用被杀死时显示推送通知。本文将详细介绍如何在iOS平台上配置和使用该插件，并提供一个完整的示例代码。

依赖项

• notification_when_app_is_killed

iOS 配置

1. 修改 ios/Podfile

为了获取通知权限，需要在 ios/Podfile 中添加以下内容：

post_install do |installer|
  installer.pods_project.targets.each do |target|
    flutter_additional_ios_build_settings(target)

    target.build_configurations.each do |config|
       config.build_settings['GCC_PREPROCESSOR_DEFINITIONS'] ||= [
        '$(inherited)',
        # dart: PermissionGroup.notification
        'PERMISSION_NOTIFICATIONS=1',
      ]
    end
  end
end

2. 修改 ios/AppDelegate.swift

在 ios/AppDelegate.swift 文件中添加以下代码：

import UserNotifications
import notification_when_app_is_killed

@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate {
   override func application(
    _ application: UIApplication,
    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
  ) -> Bool {

    if #available(iOS 10.0, *) {
        UNUserNotificationCenter.current().delegate = self as UNUserNotificationCenterDelegate
    }

   // 其他初始化代码...

  }

  override func applicationWillTerminate(_ application: UIApplication) {
    let notificationWhenAppIsKilledInstance = NotificationWhenAppIsKilledPlugin.instance
    notificationWhenAppIsKilledInstance.applicationWillTerminate();
  }
}

参考 example AppDelegate.swift 获取更多细节。

如何使用

设置通知服务

final _notificationWhenAppIsKilledPlugin = NotificationWhenAppIsKilled();

ArgsForIos argsForIos = ArgsForIos(
  interruptionLevel: InterruptionLevel.critical,
  useDefaultSound: true,
);
await _notificationWhenAppIsKilledPlugin.setNotificationOnKillService(
  ArgsForKillNotification(
      title: 'The app is killed',
      description:
          'You can see this notification when the app is killed',
      argsForIos: argsForIos),
);

取消通知服务

final _notificationWhenAppIsKilledPlugin = NotificationWhenAppIsKilled();

await _notificationWhenAppIsKilledPlugin.cancelNotificationOnKillService();

示例代码

下面是一个完整的示例代码，展示了如何在Flutter应用中集成并使用 notification_when_app_is_killed 插件：

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

import 'package:flutter/services.dart';
import 'package:notification_when_app_is_killed/model/args_for_ios.dart';
import 'package:notification_when_app_is_killed/model/args_for_kill_notification.dart';
import 'package:notification_when_app_is_killed/notification_when_app_is_killed.dart';

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

class MyApp extends StatefulWidget {
  const MyApp({super.key});

  [@override](/user/override)
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  bool _isServiceOn = false;
  final _notificationWhenAppIsKilledPlugin = NotificationWhenAppIsKilled();

  Future<void> setNotificationOnKill() async {
    bool success;
    try {
      ArgsForIos argsForIos = ArgsForIos(
        interruptionLevel: InterruptionLevel.critical,
        useDefaultSound: true,
      );
      success =
          await _notificationWhenAppIsKilledPlugin.setNotificationOnKillService(
                ArgsForKillNotification(
                    title: 'The app is killed',
                    description:
                        'You can see this notification when the app is killed',
                    androidIcon: '@raw/ic_launcher',
                    argsForIos: argsForIos),
              ) ??
              false;
    } on PlatformException {
      success = false;
    }
    if (!success) return;
    setState(() {
      _isServiceOn = true;
    });
  }

  Future<void> cancelNotificationOnKill() async {
    bool success;
    try {
      success = await _notificationWhenAppIsKilledPlugin
              .cancelNotificationOnKillService() ??
          false;
    } on PlatformException {
      success = false;
    }
    if (!success) return;
    setState(() {
      _isServiceOn = false;
    });
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Notification when app is killed example app'),
        ),
        body: Center(
          child: Column(
            mainAxisSize: MainAxisSize.min,
            children: [
              TextButton(
                  onPressed: setNotificationOnKill,
                  child: const Text('Set notification when app is killed')),
              TextButton(
                  onPressed: cancelNotificationOnKill,
                  child: const Text('Cancel notification when app is killed')),
              const SizedBox(height: 20),
              Text('Service is on: '),
              Switch(
                  value: _isServiceOn,
                  onChanged: (value) {
                    if (value) {
                      setNotificationOnKill();
                    } else {
                      cancelNotificationOnKill();
                    }
                  })
            ],
          ),
        ),
      ),
    );
  }
}