change platform os detect pattern

 import 'dart:async';
-import 'dart:io';
 
+import 'package:flutter/foundation.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter/widgets.dart';
 import 'package:mobile_scanner/src/enums/barcode_format.dart';
@@ -54,7 +54,7 @@ class MethodChannelMobileScanner extends MobileScannerPlatform {
     final List<Map<Object?, Object?>> barcodes =
         data.cast<Map<Object?, Object?>>();
 
-    if (Platform.isMacOS) {
+    if (defaultTargetPlatform == TargetPlatform.macOS) {
       return BarcodeCapture(
         raw: event,
         barcodes: barcodes
@@ -70,7 +70,8 @@ class MethodChannelMobileScanner extends MobileScannerPlatform {
       );
     }
 
-    if (Platform.isAndroid || Platform.isIOS) {
+    if (defaultTargetPlatform == TargetPlatform.android ||
+        defaultTargetPlatform == TargetPlatform.iOS) {
       final double? width = event['width'] as double?;
       final double? height = event['height'] as double?;