Added periodic task scheduling for iOS in Workmanager

ios/Runner/AppDelegate.swift

@@ -10,12 +10,17 @@ import workmanager
   ) -> Bool {
   GeneratedPluginRegistrant.register(with: self)
 
-    UIApplication.shared.setMinimumBackgroundFetchInterval(TimeInterval(60*15))
-    WorkmanagerPlugin.registerTask(withIdentifier: "io.nedaa.schedule")
+    // Just like we implemented for Android, we have set up registerPeriodicTask to run every 2 days on iOS as well.
+    WorkmanagerPlugin.setPluginRegistrantCallback { registry in
+            GeneratedPluginRegistrant.register(with: registry)
+        }
+
+    WorkmanagerPlugin.registerPeriodicTask(withIdentifier: "io.nedaa.schedule",  frequency: NSNumber(value: 172800))    
+
     if #available(iOS 10.0, *) {
       UNUserNotificationCenter.current().delegate = self as UNUserNotificationCenterDelegate
     }
 
     return super.application(application, didFinishLaunchingWithOptions: launchOptions)
   }
-}
+}

lib/main.dart

@@ -1,5 +1,3 @@
-import 'dart:io';
-
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
@@ -28,15 +26,14 @@ import 'package:workmanager/workmanager.dart';
 const taskId = 'io.nedaa.schedule';
 String appVersion = "";
 
+// This dispatcher is set up to execute the same task for both Android and iOS.
+// The task identified by 'taskId' will be executed whenever it is triggered.
 @pragma('vm:entry-point')
 void callbackDispatcher() {
   Workmanager().executeTask((task, inputData) async {
     try {
-      if (task == taskId && Platform.isAndroid) {
-        debugPrint('android task $task');
-        await _task();
-      } else if (task == Workmanager.iOSBackgroundTask) {
-        debugPrint('iOSBackgroundTask $task');
+      if (task == taskId) {
+        debugPrint('Executing scheduled task: $task');
         await _task();
       }
     } catch (e) {
@@ -114,13 +111,13 @@ void main() async {
           false // If enabled it will post a notification whenever the task is running. Handy for debugging tasks
       );
   await Workmanager().cancelAll();
-  if (Platform.isAndroid) {
-    Workmanager().registerPeriodicTask(
-      taskId,
-      taskId,
-      frequency: const Duration(days: 2),
-    );
-  }
+
+  // The periodic task registration for Android has been removed as the same task is now handled uniformly for both Android and iOS.
+  Workmanager().registerPeriodicTask(
+    taskId,
+    taskId,
+    frequency: const Duration(days: 2),
+  );
 
   // Wait 0.5 seconds before removing the splash screen
   await Future.delayed(const Duration(milliseconds: 500));

pubspec.yaml

@@ -61,7 +61,12 @@ dependencies:
   sqflite: ^2.3.2
   path: ^1.9.0
   flutter_local_notifications: ^17.0.0
-  workmanager: ^0.5.2
+
+  # We are including workmanager this way to use WorkmanagerPlugin.registerPeriodicTask
+  workmanager:
+    git:
+        url: https://github.com/fluttercommunity/flutter_workmanager.git
+        ref: b783000
   percent_indicator: ^4.2.3
   liquid_pull_to_refresh: ^3.0.1 
   hijri: ^3.0.0