add comments for error codes

Author: navaronbracke

ios/Classes/MobileScannerErrorCodes.swift

@@ -19,9 +19,12 @@ struct MobileScannerErrorCodes {
     // The error code 'BARCODE_ERROR' does not have an error message,
     // because it uses the error message from the undelying error.
     static let BARCODE_ERROR = "MOBILE_SCANNER_BARCODE_ERROR"
+    // The error code 'CAMERA_ERROR' does not have an error message,
+    // because it uses the error message from the underlying error.    
     static let CAMERA_ERROR = "MOBILE_SCANNER_CAMERA_ERROR"
     static let GENERIC_ERROR = "MOBILE_SCANNER_GENERIC_ERROR"
     static let GENERIC_ERROR_MESSAGE = "An unknown error occurred."
+    // This message is used with the 'GENERIC_ERROR' error code.
     static let INVALID_ZOOM_SCALE_ERROR_MESSAGE = "The zoom scale should be between 0 and 1 (both inclusive)"
     static let NO_CAMERA_ERROR = "MOBILE_SCANNER_NO_CAMERA_ERROR"
     static let NO_CAMERA_ERROR_MESSAGE = "No cameras available."

macos/mobile_scanner/Sources/mobile_scanner/MobileScannerErrorCodes.swift

@@ -13,6 +13,8 @@ struct MobileScannerErrorCodes {
     // The error code 'BARCODE_ERROR' does not have an error message,
     // because it uses the error message from the undelying error.
     static let BARCODE_ERROR = "MOBILE_SCANNER_BARCODE_ERROR"
+    // The error code 'CAMERA_ERROR' does not have an error message,
+    // because it uses the error message from the underlying error.       
     static let CAMERA_ERROR = "MOBILE_SCANNER_CAMERA_ERROR"
     static let NO_CAMERA_ERROR = "MOBILE_SCANNER_NO_CAMERA_ERROR"
     static let NO_CAMERA_ERROR_MESSAGE = "No cameras available."