iOS Q & A


What is internationalization in iOS?

Internationalization, often abbreviated as i18n (where 18 represents the number of letters between the first “i” and the last “n”), is the process of designing and developing software applications in a way that makes them adaptable and accessible to users from different countries, cultures, and language backgrounds. In the context of iOS development, internationalization involves designing apps to support localization and accommodate variations in language, date and time formats, currency, and other cultural conventions.


Key aspects of internationalization in iOS development include:

  • Text Localization: Internationalized apps use NSLocalizedString and .strings files to manage localized text strings, allowing them to be translated into multiple languages and displayed according to the user’s language preferences.
  • Layout and UI Adaptation: Internationalized apps accommodate differences in text length, font size, and layout directionality across languages. They use Auto Layout and dynamic UI elements to ensure that UI components adjust correctly based on the selected language.
  • Date and Time Formatting: Internationalized apps use NSDateFormatter and NSCalendar classes to format dates, times, and numeric values according to the user’s locale and region settings. This includes variations in date formats, time zones, and calendar systems.
  • Currency and Number Formatting: Internationalized apps use NSNumberFormatter to format currency, decimal, and percentage values based on the user’s locale and region. This ensures that numeric values are displayed correctly and comply with local conventions for decimal separators, thousands separators, and currency symbols.
  • Localization Testing: Internationalized apps undergo extensive testing to verify that localized text strings, UI elements, and formatting are displayed correctly in different languages and regions. Testing includes language-specific UI testing, localization validation, and compatibility testing on devices with different language settings.


By internationalizing your app, you can create a more inclusive and accessible experience for users worldwide, regardless of their language or cultural background.

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Skilled iOS Engineer with extensive experience developing cutting-edge mobile solutions. Over 7 years in iOS development.