swift-formatstyle
Formats and parses locale-aware numbers, decimals, currencies, percentages, dates, durations, measurements, names, lists, byte counts, and URLs with Foundation FormatStyle and ParseableFormatStyle. Use when replacing legacy Formatter subclasses, designing reusable format APIs, using SwiftUI Text(_:format:), correcting availability, or testing user-facing formatted output across locales.
Profile →npx skills add dpearson2699/swift-ios-skills --skill swift-formatstyle --agent claude-code
Same command for any agent — swap --agent for codex, cursor, copilot.
Weekly change comes from our own snapshots, not the repository page — it measures attention, not adoption.
# Swift FormatStyle Use Foundation's type-safe `FormatStyle` APIs for user-facing display and `ParseableFormatStyle` when the same convention must accept input. Route String Catalogs, plurals, localized copy, bundles, and RTL layout to `ios-localization`; formatting still requires locale review even when no text is translated. ## Contents - [Workflow](#workflow) - [Quick Reference](#quick-reference) - [Selection and Availability](#selection-and-availability) - [Parsing](#parsing) - [SwiftUI Integration](#swiftui-integration) - [Custom FormatStyle](#custom-formatstyle) - [Common Mistakes](#common-mistakes) - [Review Checklist](#review-checklist) - [References](#references) ## Workflow 1. Identify the value's semantic type and whether output is display-only or must round-trip through parsing. 2. Select the narrowest built-in style and keep the user's current locale unless a wire format explicitly requires another locale. 3. Render the exact UI with representative locales such as `en_US`, `de_DE`, `ar_SA`, and `ja_JP`. 4. Check separators, numbering systems, calendars, currency and unit conventions, text direction, and layout. 5. If output or parsing fails, fix the style or surroundin
- Contents
- Workflow
- Quick Reference
- Selection and Availability
- Parsing
- SwiftUI Integration
- Custom FormatStyle
- Common Mistakes
- Review Checklist
- References
What does the swift-formatstyle skill do?
Formats and parses locale-aware numbers, decimals, currencies, percentages, dates, durations, measurements, names, lists, byte counts, and URLs with Foundation FormatStyle and ParseableFormatStyle. Use when replacing legacy Formatter subclasses, designing reusable format APIs, using SwiftUI Text(_:format:), correcting availability, or testing user-facing formatted output across locales.
How do I install it?
Run `npx skills add dpearson2699/swift-ios-skills --skill swift-formatstyle --agent claude-code` — it drops the skill into your project so the agent can pick it up. Swap the --agent value for codex, cursor or copilot if you use one of those.
Where does this skill come from?
From dpearson2699/swift-ios-skills, a repository with 963 stars. We read it straight from the repository tree rather than a submitted listing, so what you see here is what is actually published.
Is a popular skill a good skill?
Not necessarily. Stars measure attention, not adoption — a repository can trend for a week and be abandoned. That is why we show the weekly change from our own snapshots next to the total, instead of a single flattering number.