An iOS development guide for building Apple-platform apps with SwiftUI, UIKit, Combine, and standard app architecture patterns. SwiftUI is Apple's newer way to describe interfaces, while UIKit is its established interface framework.

Use it for SwiftUI or UIKit interfaces, Combine data flows, view controllers, layout, and iOS app architecture.

It gives an agent the platform-specific knowledge needed to work with iOS screens, state, navigation, and app lifecycle code.

ios-expert — Skill for Claude Code by personamanagmentlayer

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 personamanagmentlayer/pcl --skill ios-expert

Clone the repo

git clone --depth 1 https://github.com/personamanagmentlayer/pcl

Made for: Claude Code.

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/personamanagmentlayer/pcl/ios-expert/github.svg)](https://agentmods.dev/skills/personamanagmentlayer/pcl/ios-expert)

Your own site

<a href="https://agentmods.dev/skills/personamanagmentlayer/pcl/ios-expert"><img src="https://agentmods.dev/badge/skills/personamanagmentlayer/pcl/ios-expert/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/personamanagmentlayer/pcl/ios-expert"><img src="https://agentmods.dev/badge/skills/personamanagmentlayer/pcl/ios-expert.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 64 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,775 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. Third-party audits

NVIDIA SkillSpector pass 7 Sept 2026

How audits are shown

Origin original No closer match found 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	$0.00064	$0.01775
Opus 5	$0.00032	$0.00888
Sonnet 5	$0.00013	$0.00355
Haiku 4.5	$0.00006	$0.00178

Measured 5d ago against content hash 998f22c38298, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

ios-expert 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 5d 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.

stdlib/frameworks/ios-expert/SKILL.md · 222 lines

How it starts

The opening of the file, as written. The whole thing — 222 lines — stays where its author put it; the contents beside it link to each section on GitHub.

iOS Expert

You are an expert in iOS development, SwiftUI, UIKit, Swift programming, and Apple ecosystem integration.

Core Concepts

iOS App Architecture

MVC (Model-View-Controller): Traditional UIKit pattern
MVVM (Model-View-ViewModel): Modern pattern with SwiftUI/Combine
Coordinator Pattern: Navigation logic separation
Clean Architecture: Domain, presentation, data layers
App Lifecycle: UIApplicationDelegate, SceneDelegate, App protocol
Scenes: Multi-window support on iPad

SwiftUI Fundamentals

Declarative UI: Describe what UI should look like
Views: Struct-based, immutable, value types
State Management: @State, @Binding, @ObservedObject, @StateObject, @EnvironmentObject
Property Wrappers: @Published, @Environment, @AppStorage, @FetchRequest
View Modifiers: Chainable transformations
Previews: Live canvas previews

UIKit Essentials

View Hierarchy: UIView, UIViewController
Layout: Auto Layout, NSLayoutConstraint, StackView
Delegate Pattern: UITableViewDelegate, UICollectionViewDelegate
Target-Action: Button events, gesture recognizers
View Controller Lifecycle: viewDidLoad, viewWillAppear, viewDidAppear
Storyboards vs Code: Interface Builder vs programmatic UI

Combine Framework

Publishers: Emit values over time
Subscribers: Receive values
Operators: Transform, filter, combine streams
Subjects: PassthroughSubject, CurrentValueSubject
Cancellables: Manage subscriptions

Data Persistence

UserDefaults: Simple key-value storage
Keychain: Secure credential storage
Core Data: Object graph and persistence framework
SwiftData: Modern declarative data modeling (iOS 17+)
FileManager: File system access
CloudKit: iCloud synchronization

Networking

URLSession: HTTP requests, downloads, uploads
Codable: JSON encoding/decoding
Async/Await: Modern asynchronous programming
Combine + URLSession: Reactive networking
Network: Monitor connectivity status

Read the full file on GitHub · 222 lines

Files

What ships with it

1 file 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.

references/EXAMPLES.md 12 KB

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.

5d ago First seen · 222 lines · 64 tokens per session scan A 998f22c38298

Subscribe to this mod's changes

ios-expert is a skill published in the GitHub repository personamanagmentlayer/pcl (40 stars, last pushed 2d ago), licensed Apache-2.0. It adds 64 tokens to every session and 1,775 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-05.

Kotlin and Swift Languages Mobile anthropic apple claude deepseek frameworks gemini ios swift swiftui uikit xcode

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