---
title: userInterfaceLanguage
framework: proximityreader
role: symbol
role_heading: Instance Property
path: proximityreader/paymentcardtransactionrequest/userinterfacelanguage
---

# userInterfaceLanguage

The language the framework uses when localizing the user interface.

## Declaration

```swift
var userInterfaceLanguage: Locale.Language?
```

## Discussion

Discussion Setting this attribute only affects customer facing elements. Screen elements or audio targeted at the merchant (device owner) remain set to the language defined in the system settings. When you set this option to nil, the framework uses the person’s preferred language defined in System Settings.