Updated README.md

README.md

@@ -13,10 +13,40 @@ Handle camera access permission
 
 ### **IOS**
 
-Add a String property to the app's Info.plist file with the key NSCameraUsageDescription and the value as the description for why your app needs camera access.
-
-	<key>NSCameraUsageDescription</key>
-	<string>Camera Permission Description</string>
+1. Add a String property to the app's Info.plist file with the key NSCameraUsageDescription and the value as the description for why your app needs camera access.
+
+   <key>NSCameraUsageDescription</key>
+   <string>Camera Permission Description</string>
+
+2. The <kbd>permission_handler</kbd> dependency used by cunning_document_scanner use [macros](https://github.com/Baseflow/flutter-permission-handler/blob/master/permission_handler_apple/ios/Classes/PermissionHandlerEnums.h) to control whether a permission is enabled. Add the following to your `Podfile` file:
+
+   ```ruby
+   post_install do |installer|
+     installer.pods_project.targets.each do |target|
+       ... # Here are some configurations automatically generated by flutter
+
+       # Start of the permission_handler configuration
+       target.build_configurations.each do |config|
+
+         # You can enable the permissions needed here. For example to enable camera
+         # permission, just remove the `#` character in front so it looks like this:
+         #
+         # ## dart: PermissionGroup.camera
+         # 'PERMISSION_CAMERA=1'
+         #
+         #  Preprocessor definitions can be found at: https://github.com/Baseflow/flutter-permission-handler/blob/master/permission_handler_apple/ios/Classes/PermissionHandlerEnums.h
+         config.build_settings['GCC_PREPROCESSOR_DEFINITIONS'] ||= [
+           '$(inherited)',
+
+           ## dart: PermissionGroup.camera
+           'PERMISSION_CAMERA=1',
+         ]
+
+       end
+       # End of the permission_handler configuration
+     end
+   end
+   ```
 
 ### **Android**