Added raw-bytes support for iOS

ios/Classes/QRView.swift

@@ -162,8 +162,33 @@ public class QRView:NSObject,FlutterPlatformView {
                                     default:
                                         return
                                 }
-                                guard let stringValue = code.stringValue else { continue }
-                               let result = ["code": stringValue, "type": typeString]
+                                let bytes = { () -> Data? in
+                                    switch (code.descriptor) {
+                                    case let qrDescriptor as CIQRCodeDescriptor:
+                                        return qrDescriptor.errorCorrectedPayload
+                                    case let aztecDescriptor as CIAztecCodeDescriptor:
+                                        return aztecDescriptor.errorCorrectedPayload
+                                    case let pdf417Descriptor as CIPDF417CodeDescriptor:
+                                        return pdf417Descriptor.errorCorrectedPayload
+                                    case let dataMatrixDescriptor as CIDataMatrixCodeDescriptor:
+                                        return dataMatrixDescriptor.errorCorrectedPayload
+                                    default:
+                                        return nil
+                                    }
+                                }()
+                                let result = { () -> [String : Any]? in
+                                    guard let stringValue = code.stringValue else {
+                                        guard let safeBytes = bytes else {
+                                            return nil
+                                        }
+                                        return ["type": typeString, "rawBytes": safeBytes]
+                                    }
+                                    guard let safeBytes = bytes else {
+                                        return ["code": stringValue, "type": typeString]
+                                    }
+                                    return ["code": stringValue, "type": typeString, "rawBytes": safeBytes]
+                                }()
+                                guard let safeResult = result else { continue }
                                 if allowedBarcodeTypes.count == 0 || allowedBarcodeTypes.contains(code.type) {
                                     self?.channel.invokeMethod("onRecognizeQR", arguments: result)
                                 }

lib/src/qr_code_scanner.dart

@@ -187,7 +187,7 @@ class QRViewController {
         case 'onRecognizeQR':
           if (call.arguments != null) {
             final args = call.arguments as Map;
-            final code = args['code'] as String;
+            final code = args['code'] as String?;
             final rawType = args['type'] as String;
             // Raw bytes are only supported by Android.
             final rawBytes = args['rawBytes'] as List<int>?;

lib/src/types/barcode.dart

@@ -2,15 +2,15 @@ import 'barcode_format.dart';
 
 /// The [Barcode] object holds information about the barcode or qr code.
 ///
-/// [code] is the content of the barcode.
+/// [code] is the string-content of the barcode.
 /// [format] displays which type the code is.
-/// Only for Android, [rawBytes] gives a list of bytes of the result.
+/// Only for Android and iOS, [rawBytes] gives a list of bytes of the result.
 class Barcode {
   Barcode(this.code, this.format, this.rawBytes);
 
-  final String code;
+  final String? code;
   final BarcodeFormat format;
 
-  /// Raw bytes are only supported by Android.
+  /// Raw bytes are only supported by Android and iOS.
   final List<int>? rawBytes;
 }