ios-localization

SKILL.md

Multi-language iOS apps with String Catalogs, locale-aware formatting, and RTL layout support.

Covers String Catalogs (.xcstrings) for automatic string extraction, pluralization, and device variations; replaces legacy .strings and .stringsdict files

Provides decision guide for three modern string types: LocalizedStringKey (SwiftUI implicit), String(localized:) (explicit resolution), and LocalizedStringResource (deferred resolution for App Intents and widgets)

Includes FormatStyle patterns for dates, numbers, currencies, measurements, and lists that automatically adapt to user locale without hardcoding formats

Covers right-to-left layout for Arabic, Hebrew, and similar languages; SwiftUI auto-mirrors most layouts, but requires manual attention for directional images and fixed positioning

Common mistakes section and review checklist prevent App Store rejections, truncation bugs, and broken RTL layouts

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)

Generated Localizable 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)