iOS Localization & Internationalization

Localize iOS 26+ apps using String Catalogs, modern string types, FormatStyle, and RTL-aware layout. Localization mistakes cause App Store rejections in non-English markets, mistranslated UI, and broken layouts. Ship with correct localization from the start.

Contents

• String Catalogs (.xcstrings)
• String Catalogs (Xcode 15+) and Generated Symbols (Xcode 26+)
• String Types -- Decision Guide
• String Interpolation in Localized Strings
• Pluralization
• FormatStyle -- Locale-Aware Formatting
• Right-to-Left (RTL) Layout
• Common Mistakes
• Localization Review Checklist
• References

String Catalogs (.xcstrings)