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SKILL.md

name ios-application-dev
description iOS application development guide covering UIKit, SnapKit, and SwiftUI. Includes touch targets, safe areas, navigation patterns, Dynamic Type, Dark Mode, accessibility, collection views, common UI components, and SwiftUI design guidelines. For detailed references on specific topics, see the reference files. Use when: developing iOS apps, implementing UI, reviewing iOS code, working with UIKit/SnapKit/SwiftUI layouts, building iPhone interfaces, Swift mobile development, Apple HIG compliance, iOS accessibility implementation.
license MIT
metadata [object Object]

iOS Application Development Guide

A practical guide for building iOS applications using UIKit, SnapKit, and SwiftUI. Focuses on proven patterns and Apple platform conventions.

Quick Reference

UIKit

Purpose Component
Main sections UITabBarController
Drill-down UINavigationController
Focused task Sheet presentation
Critical choice UIAlertController
Secondary actions UIContextMenuInteraction
List content UICollectionView + DiffableDataSource
Sectioned list DiffableDataSource + headerMode
Grid layout UICollectionViewCompositionalLayout
Search UISearchController
Share UIActivityViewController
Location (once) CLLocationButton
Feedback UIImpactFeedbackGenerator
Linear layout UIStackView
Custom shapes CAShapeLayer + UIBezierPath
Gradients CAGradientLayer
Modern buttons UIButton.Configuration
Dynamic text UIFontMetrics + preferredFont
Dark mode Semantic colors (.systemBackground, .label)
Permissions Contextual request + AVCaptureDevice
Lifecycle UIApplication notifications

SwiftUI

Purpose Component
Main sections TabView + tabItem
Drill-down NavigationStack + NavigationPath
Focused task .sheet + presentationDetents
Critical choice .alert
Secondary actions .contextMenu
List content List + .insetGrouped
Search .searchable
Share ShareLink
Location (once) LocationButton
Feedback UIImpactFeedbackGenerator
Progress (known) ProgressView(value:total:)
Progress (unknown) ProgressView()
Dynamic text .font(.body) semantic styles
Dark mode .primary, .secondary, Color(.systemBackground)
Scene lifecycle @Environment(\.scenePhase)
Reduce motion @Environment(\.accessibilityReduceMotion)
Dynamic type @Environment(\.dynamicTypeSize)

Core Principles

Layout

  • Touch targets >= 44pt
  • Content within safe areas (SwiftUI respects by default, use .ignoresSafeArea() only for backgrounds)
  • Use 8pt spacing increments (8, 16, 24, 32, 40, 48)
  • Primary actions in thumb zone
  • Support all screen sizes (iPhone SE 375pt to Pro Max 430pt)

Typography

  • UIKit: preferredFont(forTextStyle:) + adjustsFontForContentSizeCategory = true
  • SwiftUI: semantic text styles .headline, .body, .caption
  • Custom fonts: UIFontMetrics / Font.custom(_:size:relativeTo:)
  • Adapt layout at accessibility sizes (minimum 11pt)

Colors

  • Use semantic system colors (.systemBackground, .label, .primary, .secondary)
  • Asset catalog variants for custom colors (Any/Dark Appearance)
  • No color-only information (pair with icons or text)
  • Contrast ratio >= 4.5:1 for normal text, 3:1 for large text

Accessibility

  • Labels on icon buttons (.accessibilityLabel())
  • Reduce motion respected (@Environment(\.accessibilityReduceMotion))
  • Logical reading order (.accessibilitySortPriority())
  • Support Bold Text, Increase Contrast preferences

Navigation

  • Tab bar (3-5 sections) stays visible during navigation
  • Back swipe works (never override system gestures)
  • State preserved across tabs (@SceneStorage, @State)
  • Never use hamburger menus

Privacy & Permissions

  • Request permissions in context (not at launch)
  • Custom explanation before system dialog
  • Support Sign in with Apple
  • Respect ATT denial

Checklist

Layout

  • Touch targets >= 44pt
  • Content within safe areas
  • Primary actions in thumb zone (bottom half)
  • Flexible widths for all screen sizes (SE to Pro Max)
  • Spacing aligns to 8pt grid

Typography

  • Semantic text styles or UIFontMetrics-scaled custom fonts
  • Dynamic Type supported up to accessibility sizes
  • Layouts reflow at large sizes (no truncation)
  • Minimum text size 11pt

Colors

  • Semantic system colors or light/dark asset variants
  • Dark Mode is intentional (not just inverted)
  • No color-only information
  • Text contrast >= 4.5:1 (normal) / 3:1 (large)
  • Single accent color for interactive elements

Accessibility

  • VoiceOver labels on all interactive elements
  • Logical reading order
  • Bold Text preference respected
  • Reduce Motion disables decorative animations
  • All gestures have alternative access paths

Navigation

  • Tab bar for 3-5 top-level sections
  • No hamburger/drawer menus
  • Tab bar stays visible during navigation
  • Back swipe works throughout
  • State preserved across tabs

Components

  • Alerts for critical decisions only
  • Sheets have dismiss path (button and/or swipe)
  • List rows >= 44pt tall
  • Destructive buttons use .destructive role

Privacy

  • Permissions requested in context (not at launch)
  • Custom explanation before system permission dialog
  • Sign in with Apple offered with other providers
  • Basic features usable without account
  • ATT prompt shown if tracking, denial respected

System Integration

  • App handles interruptions gracefully (calls, background, Siri)
  • App content indexed for Spotlight
  • Share Sheet available for shareable content

References

Topic Reference
Touch Targets, Safe Area, CollectionView Layout System
TabBar, NavigationController, Modal Navigation Patterns
StackView, Button, Alert, Search, ContextMenu UIKit Components
CAShapeLayer, CAGradientLayer, Core Animation Graphics & Animation
Dynamic Type, Semantic Colors, VoiceOver Accessibility
Permissions, Location, Share, Lifecycle, Haptics System Integration
Metal Shaders & GPU Metal Shader Reference
SwiftUI HIG, Components, Patterns, Anti-Patterns SwiftUI Design Guidelines
Optionals, Protocols, async/await, ARC, Error Handling Swift Coding Standards

Swift, SwiftUI, UIKit, SF Symbols, Metal, and Apple are trademarks of Apple Inc. SnapKit is a trademark of its respective owners.