Fix #74: iOS missing camera permision grant when using scan QR code function

Signed-off-by: huynguyennovem <huynguyennovem@gmail.com>

Author: huynguyennovem

ios/Podfile

@@ -37,5 +37,14 @@ end
 post_install do |installer|
   installer.pods_project.targets.each do |target|
     flutter_additional_ios_build_settings(target)
+
+    # Start of the permission_handler configuration
+    target.build_configurations.each do |config|
+        config.build_settings['GCC_PREPROCESSOR_DEFINITIONS'] ||= [
+            '$(inherited)',
+            ## dart: PermissionGroup.camera
+            'PERMISSION_CAMERA=1',
+        ]
+    end
   end
 end