chore: update log messages and method channel handling

- Update log message format in CustomLogger class
- Refactor main thread dispatch logic for method channel calls in Utils.swift
- Enhance error handling and main thread dispatch in OptimizelyFlutterLogger.swift
- Modify method channel creation and task queue handling in SwiftOptimizelyFlutterSdkPlugin.swift

Author: muzahidul-opti

example/lib/custom_logger.dart

@@ -5,7 +5,7 @@ class CustomLogger implements OptimizelyLogger {
   @override
   void log(OptimizelyLogLevel level, String message) {
     if (kDebugMode) {
-      print('[Flutter LOGGER] ${level.name}: $message');
+      print('[OPTIMIZELY] ${level.name.toUpperCase()}: $message');
     }
   }
 }

ios/Classes/HelperClasses/Utils.swift

@@ -65,10 +65,7 @@ public class Utils: NSObject {
                 "url"       : url,
                 "params"    : logEvent as Any
             ]
-            // Dispatch to main thread for Flutter method channel call. Platform channel messages must be sent on the platform thread to avoid data loss or crashes.
-            DispatchQueue.main.async {
-                SwiftOptimizelyFlutterSdkPlugin.channel.invokeMethod("\(NotificationType.logEvent)CallbackListener", arguments: [RequestParameterKey.sdkKey: sdkKey, RequestParameterKey.notificationId: id, RequestParameterKey.notificationType: NotificationType.logEvent, RequestParameterKey.notificationPayload: listenerDict])
-            }
+            SwiftOptimizelyFlutterSdkPlugin.channel.invokeMethod("\(NotificationType.logEvent)CallbackListener", arguments: [RequestParameterKey.sdkKey: sdkKey, RequestParameterKey.notificationId: id, RequestParameterKey.notificationType: NotificationType.logEvent, RequestParameterKey.notificationPayload: listenerDict])
         }
 
         return listener
@@ -97,10 +94,7 @@ public class Utils: NSObject {
                 "attributes"   : attributes as Any,
                 "variation"    : variation
             ]
-            // Dispatch to main thread for Flutter method channel call
-            DispatchQueue.main.async {
-                SwiftOptimizelyFlutterSdkPlugin.channel.invokeMethod("\(NotificationType.activate)CallbackListener", arguments: [RequestParameterKey.sdkKey: sdkKey, RequestParameterKey.notificationId: id, RequestParameterKey.notificationType: NotificationType.activate, RequestParameterKey.notificationPayload: listenerDict])
-            }
+            SwiftOptimizelyFlutterSdkPlugin.channel.invokeMethod("\(NotificationType.activate)CallbackListener", arguments: [RequestParameterKey.sdkKey: sdkKey, RequestParameterKey.notificationId: id, RequestParameterKey.notificationType: NotificationType.activate, RequestParameterKey.notificationPayload: listenerDict])
         }
         return listener
     }
@@ -114,10 +108,7 @@ public class Utils: NSObject {
                 "attributes"  : attributes as Any,
                 "decisionInfo": decisionInfo
             ]
-            // Dispatch to main thread for Flutter method channel call
-            DispatchQueue.main.async {
-                SwiftOptimizelyFlutterSdkPlugin.channel.invokeMethod("\(NotificationType.decision)CallbackListener", arguments: [RequestParameterKey.sdkKey: sdkKey, RequestParameterKey.notificationId: id, RequestParameterKey.notificationType: NotificationType.decision, RequestParameterKey.notificationPayload: listenerDict])
-            }
+            SwiftOptimizelyFlutterSdkPlugin.channel.invokeMethod("\(NotificationType.decision)CallbackListener", arguments: [RequestParameterKey.sdkKey: sdkKey, RequestParameterKey.notificationId: id, RequestParameterKey.notificationType: NotificationType.decision, RequestParameterKey.notificationPayload: listenerDict])
         }
         return listener
     }
@@ -132,9 +123,7 @@ public class Utils: NSObject {
                 "userId"       : userId,
                 //                "event": event as Any, This is causing codec related exceptions on flutter side, need to debug
             ]
-            DispatchQueue.main.async {
-                SwiftOptimizelyFlutterSdkPlugin.channel.invokeMethod("\(NotificationType.track)CallbackListener", arguments: [RequestParameterKey.sdkKey: sdkKey, RequestParameterKey.notificationId: id, RequestParameterKey.notificationType: NotificationType.track, RequestParameterKey.notificationPayload: listenerDict])
-            }
+            SwiftOptimizelyFlutterSdkPlugin.channel.invokeMethod("\(NotificationType.track)CallbackListener", arguments: [RequestParameterKey.sdkKey: sdkKey, RequestParameterKey.notificationId: id, RequestParameterKey.notificationType: NotificationType.track, RequestParameterKey.notificationPayload: listenerDict])
         }
         return listener
     }

ios/Classes/OptimizelyFlutterLogger.swift

@@ -28,21 +28,12 @@ public class OptimizelyFlutterLogger: NSObject, OPTLogger {
             return
         }
 
-        // Ensure logging happens on main thread as FlutterMethodChannel requires it
-        if Thread.isMainThread {
-            // Already on main thread
+        // https://docs.flutter.dev/platform-integration/platform-channels#jumping-to-the-main-thread-in-ios
+        DispatchQueue.main.async {
             channel.invokeMethod("log", arguments: [
                 "level": level.rawValue,
                 "message": message
             ])
-        } else {
-            // Switch to main thread
-            DispatchQueue.main.sync {
-                channel.invokeMethod("log", arguments: [
-                    "level": level.rawValue,
-                    "message": message
-                ])
-            }
         }
     }
 }

ios/Classes/SwiftOptimizelyFlutterSdkPlugin.swift

@@ -45,7 +45,11 @@ public class SwiftOptimizelyFlutterSdkPlugin: NSObject, FlutterPlugin {
         registrar.addMethodCallDelegate(instance, channel: channel)
 
         // Separate logger channel for outgoing log calls
-        let loggerChannel = FlutterMethodChannel(name: OptimizelyFlutterLogger.LOGGER_CHANNEL, binaryMessenger: registrar.messenger())
+        let taskQueue = registrar.messenger().makeBackgroundTaskQueue?()
+        let loggerChannel = FlutterMethodChannel(name: OptimizelyFlutterLogger.LOGGER_CHANNEL, 
+                                                binaryMessenger: registrar.messenger(), 
+                                                codec: FlutterStandardMethodCodec.sharedInstance(),
+                                                taskQueue: taskQueue)
         OptimizelyFlutterLogger.setChannel(loggerChannel)
     }