Update: BackgroundServicePlugin

ios/Podfile.lock

@@ -211,4 +211,4 @@ SPEC CHECKSUMS:
 
 PODFILE CHECKSUM: 472b36355d7f1afce121640438e776da12affe90
 
-COCOAPODS: 1.11.2
+COCOAPODS: 1.11.3

ios/Runner/AppDelegate.swift

@@ -1,18 +1,25 @@
 import UIKit
 import Flutter
 import flutter_downloader
+import flutter_background_service
 
 @UIApplicationMain
 @objc class AppDelegate: FlutterAppDelegate {
 	override func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
-		GeneratedPluginRegistrant.register(with: self)
-		FlutterDownloaderPlugin.setPluginRegistrantCallback(registerPlugins)
-		return super.application(application, didFinishLaunchingWithOptions: launchOptions)
+		AppDelegate.registerPlugins(with: self)
+		FlutterDownloaderPlugin.setPluginRegistrantCallback { registry in
+			if (!registry.hasPlugin("FlutterDownloaderPlugin")) {
+				FlutterDownloaderPlugin.register(with: registry.registrar(forPlugin: "FlutterDownloaderPlugin")!)
 			}
 		}
+		SwiftFlutterBackgroundServicePlugin.setPluginRegistrantCallback { registry in
+			AppDelegate.registerPlugins(with: registry)
+		}
 		
-private func registerPlugins(registry: FlutterPluginRegistry) {
-	if (!registry.hasPlugin("FlutterDownloaderPlugin")) {
-		FlutterDownloaderPlugin.register(with: registry.registrar(forPlugin: "FlutterDownloaderPlugin")!)
+		return super.application(application, didFinishLaunchingWithOptions: launchOptions)
+	}
+	
+	static func registerPlugins(with registry: FlutterPluginRegistry) {
+		GeneratedPluginRegistrant.register(with: registry)
 	}
 }