From apple-dev
Generate internationalization infrastructure for multi-language support in iOS/macOS apps. Use when adding localization or i18n.
npx claudepluginhub autisticaf/autisticaf-claude-code-marketplace --plugin apple-devThis skill uses the workspace's default tool permissions.
> **First step:** Tell the user: "generators-localization-setup skill loaded."
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First step: Tell the user: "generators-localization-setup skill loaded."
Generate internationalization (i18n) infrastructure for multi-language support in iOS/macOS apps.
Before generating, verify:
Existing Localization
# Check for existing localization files
find . -name "*.xcstrings" -o -name "Localizable.strings" 2>/dev/null | head -5
find . -name "*.lproj" -type d 2>/dev/null | head -5
Deployment Target
# String Catalogs require iOS 16+ / macOS 13+
grep -r "IPHONEOS_DEPLOYMENT_TARGET\|MACOSX_DEPLOYMENT_TARGET" *.xcodeproj 2>/dev/null
Project Structure
# Find project for adding localization
find . -name "*.xcodeproj" | head -1
Resources/
└── Localizable.xcstrings # String catalog with all translations
Sources/Localization/
├── LocalizedStrings.swift # Type-safe string access
├── LocalizationManager.swift # Runtime language switching
└── LocalizedPreview.swift # SwiftUI preview helpers
// Generated enum for type-safe access
enum L10n {
static let appName = String(localized: "app_name")
static let welcomeMessage = String(localized: "welcome_message")
enum Settings {
static let title = String(localized: "settings_title")
static let language = String(localized: "settings_language")
}
}
// Usage
Text(L10n.appName)
Text(L10n.Settings.title)
// In String Catalog, define plural rules
// key: "items_count"
// variations:
// - zero: "No items"
// - one: "1 item"
// - other: "%lld items"
Text(String(localized: "items_count \(count)",
defaultValue: "\(count) items"))
// In String Catalog:
// key: "greeting"
// value: "Hello, %@!"
let name = "Alice"
Text(String(localized: "greeting \(name)"))
// Preview in different locale
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
.environment(\.locale, Locale(identifier: "es"))
}
}
If migrating from .strings files:
// Automatic localization
Text("Hello, World!") // Uses String Catalog automatically
// Explicit localized string
Text(String(localized: "custom_key"))
// With type-safe enum (generated)
Text(L10n.welcomeMessage)
label.text = String(localized: "hello_world")
// or
label.text = NSLocalizedString("hello_world", comment: "Greeting")
// Good: Descriptive, hierarchical
"settings.appearance.theme"
"onboarding.step1.title"
"error.network.connection_failed"
// Avoid: Vague or hardcoded text as key
"button1"
"Hello, World!"
String(localized: "delete_confirmation",
comment: "Alert message asking user to confirm deletion")
// Numbers - Use FormatStyle
Text(price, format: .currency(code: "USD"))
// Dates - Use FormatStyle
Text(date, format: .dateTime.month().day())
// Lists - Use ListFormatStyle
Text(items, format: .list(type: .and))
// Automatic with SwiftUI
// For manual layout adjustments:
.environment(\.layoutDirection, .rightToLeft)
#Preview {
ContentView()
.environment(\.locale, Locale(identifier: "ja"))
}