What is swiftui-expert-skill?

A SwiftUI coding guide for building, reviewing, and refactoring app interfaces. SwiftUI is Apple’s framework for declaring screens and controls, and this guide covers state, views, performance, platform APIs, and version compatibility.

Use it for SwiftUI feature work, code reviews, refactoring, state management, view composition, and iOS or macOS interface updates.

It helps agents use current native APIs, identify deprecated code, and keep newer features working on supported older system versions.

swiftui-expert-skill — Skill by catch-the-wave

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add catch-the-wave/fullstack-ios-claude-skills --skill swiftui-expert-skill

Clone the repo

git clone --depth 1 https://github.com/catch-the-wave/fullstack-ios-claude-skills

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/catch-the-wave/fullstack-ios-claude-skills/swiftui-expert-skill/github.svg)](https://agentmods.dev/skills/catch-the-wave/fullstack-ios-claude-skills/swiftui-expert-skill)

Your own site

<a href="https://agentmods.dev/skills/catch-the-wave/fullstack-ios-claude-skills/swiftui-expert-skill"><img src="https://agentmods.dev/badge/skills/catch-the-wave/fullstack-ios-claude-skills/swiftui-expert-skill/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/catch-the-wave/fullstack-ios-claude-skills/swiftui-expert-skill"><img src="https://agentmods.dev/badge/skills/catch-the-wave/fullstack-ios-claude-skills/swiftui-expert-skill.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 67 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,351 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin 94% copy Near-identical to another mod in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00067	$0.01351
Opus 5.5	$0.00027	$0.00540
Sonnet 5.5	$0.00013	$0.00270
Haiku 4.5	$0.00007	$0.00135

Measured 1mo ago against content hash e593187876ae, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

swiftui-expert-skill scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

This is a copy

94% identical to swiftui-expert-skill — 4 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

dev/swiftui-expert-skill/SKILL.md · 103 lines

How it starts

The opening of the file, as written. The whole thing — 103 lines — stays where its author put it; the contents beside it link to each section on GitHub.

SwiftUI Expert Skill

Operating Rules

Consult references/latest-apis.md at the start of every task to avoid deprecated APIs
Prefer native SwiftUI APIs over UIKit/AppKit bridging unless bridging is necessary
Focus on correctness and performance; do not enforce specific architectures (MVVM, VIPER, etc.)
Encourage separating business logic from views for testability without mandating how
Follow Apple's Human Interface Guidelines and API design patterns
Only adopt Liquid Glass when explicitly requested by the user (see references/liquid-glass.md)
Present performance optimizations as suggestions, not requirements
Use #available gating with sensible fallbacks for version-specific APIs

Task Workflow

Review existing SwiftUI code

Read the code under review and identify which topics apply
Flag deprecated APIs (compare against references/latest-apis.md)
Run the Topic Router below for each relevant topic
Validate #available gating and fallback paths for iOS 26+ features

Improve existing SwiftUI code

Audit current implementation against the Topic Router topics
Replace deprecated APIs with modern equivalents from references/latest-apis.md
Refactor hot paths to reduce unnecessary state updates
Extract complex view bodies into separate subviews
Suggest image downsampling when UIImage(data:) is encountered (optional optimization, see references/image-optimization.md)

Implement new SwiftUI feature

Design data flow first: identify owned vs injected state
Structure views for optimal diffing (extract subviews early)
Apply correct animation patterns (implicit vs explicit, transitions)
Use Button for all tappable elements; add accessibility grouping and labels
Gate version-specific APIs with #available and provide fallbacks

Topic Router

Consult the reference file for each topic relevant to the current task:

Topic	Reference
State management	`references/state-management.md`
View composition	`references/view-structure.md`
Performance	`references/performance-patterns.md`
Lists and ForEach	`references/list-patterns.md`
Layout	`references/layout-best-practices.md`
Sheets and navigation	`references/sheet-navigation-patterns.md`
ScrollView	`references/scroll-patterns.md`
Animations (basics)	`references/animation-basics.md`
Animations (transitions)	`references/animation-transitions.md`
Animations (advanced)	`references/animation-advanced.md`
Accessibility	`references/accessibility-patterns.md`
Swift Charts	`references/charts.md`
Charts accessibility	`references/charts-accessibility.md`
Image optimization	`references/image-optimization.md`
Liquid Glass (iOS 26+)	`references/liquid-glass.md`
macOS scenes	`references/macos-scenes.md`
macOS window styling	`references/macos-window-styling.md`
macOS views	`references/macos-views.md`
Deprecated API lookup	`references/latest-apis.md`

Read the full file on GitHub · 103 lines

Files

What ships with it

19 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

1mo ago First seen · 103 lines · 67 tokens per session scan A e593187876ae

Subscribe to this mod's changes

swiftui-expert-skill is a skill published in the GitHub repository catch-the-wave/fullstack-ios-claude-skills (5 stars, last pushed 1mo ago), licensed MIT. It adds 67 tokens to every session and 1,351 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 94% identical to swiftui-expert-skill, differing in 4 lines, and is treated as a copy.

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