Swift Formatstyle

FormatStyle is Swift's modern, type-safe replacement for the old Formatter classes, and this skill covers the full range: numbers, currency, percentages, dates, durations, measurements, person names, lists, byte counts, and URLs. The quick reference table alone will save you digging through documentation every time you need to format a currency or a relative date. What stands out is the focus on locale awareness as an i18n concern even in single-language apps, with a clear boundary drawn between FormatStyle mechanics and broader localization work. The custom FormatStyle section shows you how to build your own conformances when the built-in types don't fit. Duration formatting requires iOS 16+, but everything else works from iOS 15 onward.

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GitHub stars: 1.3K
last updated: Aug 21, 2026

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Install

$ npx -y skills add dpearson2699/swift-ios-skills --skill swift-formatstyle --agent claude-code

Installs into .claude/skills of the current project.

Files

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.