mobile-ios-design

name mobile-ios-design description Master iOS Human Interface Guidelines and SwiftUI patterns for building native iOS apps. Use when designing iOS interfaces, implementing SwiftUI views, or ensuring apps follow Apple's design principles. iOS Mobile Design Master iOS Human Interface Guidelines (HIG) and SwiftUI patterns to build polished, native iOS applications that feel at home on Apple platforms. When to Use This Skill Designing iOS app interfaces following Apple HIG Building SwiftUI views and layouts Implementing iOS navigation patterns (NavigationStack, TabView, sheets) Creating adaptive layouts for iPhone and iPad Using SF Symbols and system typography Building accessible iOS interfaces Implementing iOS-specific gestures and interactions Designing for Dynamic Type and Dark Mode Core Concepts 1. Human Interface Guidelines Principles Clarity : Content is legible, icons are precise, adornments are subtle Deference : UI helps users understand content without competing with it Depth : Visual layers and motion convey hierarchy and enable navigation Platform Considerations: iOS : Touch-first, compact displays, portrait orientation iPadOS : Larger canvas, multitasking, pointer support visionOS : Spatial computing, eye/hand input 2. SwiftUI Layout System Stack-Based Layouts: // Vertical stack with alignment VStack (alignment: .leading, spacing: 12 ) { Text ( "Title" ) .font(.headline) Text ( "Subtitle" ) .font(.subheadline) .foregroundStyle(.secondary) } // Horizontal stack with flexible spacing HStack { Image (systemName: "star.fill" ) Text ( "Featured" ) Spacer () Text ( "View All" ) .foregroundStyle(.blue) } Grid Layouts: // Adaptive grid that fills available width LazyVGrid (columns: [ GridItem (.adaptive(minimum: 150 , maximum: 200 )) ], spacing: 16 ) { ForEach (items) { item in ItemCard (item: item) } } // Fixed column grid LazyVGrid (columns: [ GridItem (.flexible()), GridItem (.flexible()), GridItem (.flexible()) ], spacing: 12 ) { ForEach (items) { item in ItemThumbnail (item: item) } } 3. Navigation Patterns NavigationStack (iOS 16+): struct ContentView : View { @State private var path = NavigationPath () var body: some View { NavigationStack (path: $path ) { List (items) { item in NavigationLink (value: item) { ItemRow (item: item) } } .navigationTitle( "Items" ) .navigationDestination(for: Item . self ) { item in ItemDetailView (item: item) } } } } TabView (iOS 18+): struct MainTabView : View { @State private var selectedTab = 0 var body: some View { TabView (selection: $selectedTab ) { Tab ( "Home" , systemImage: "house" , value: 0 ) { HomeView () } Tab ( "Search" , systemImage: "magnifyingglass" , value: 1 ) { SearchView () } Tab ( "Profile" , systemImage: "person" , value: 2 ) { ProfileView () } } } } 4. System Integration SF Symbols: // Basic symbol Image (systemName: "heart.fill" ) .foregroundStyle(.red) // Symbol with rendering mode Image (systemName: "cloud.sun.fill" ) .symbolRenderingMode(.multicolor) // Variable symbol (iOS 16+) Image (systemName: "speaker.wave.3.fill" , variableValue: volume) // Symbol effect (iOS 17+) Image (systemName: "bell.fill" ) .symbolEffect(.bounce, value: notificationCount) Dynamic Type: // Use semantic fonts Text ( "Headline" ) .font(.headline) Text ( "Body text that scales with user preferences" ) .font(.body) // Custom font that respects Dynamic Type Text ( "Custom" ) .font(.custom( "Avenir" , size: 17 , relativeTo: .body)) 5. Visual Design Colors and Materials: // Semantic colors that adapt to light/dark mode Text ( "Primary" ) .foregroundStyle(.primary) Text ( "Secondary" ) .foregroundStyle(.secondary) // System materials for blur effects Rectangle () .fill(.ultraThinMaterial) .frame(height: 100 ) // Vibrant materials for overlays Text ( "Overlay" ) .padding() .background(.regularMaterial, in: RoundedRectangle (cornerRadius: 12 )) Shadows and Depth: // Standard card shadow RoundedRectangle (cornerRadius: 16 ) .fill(.background) .shadow(color: .black.opacity( 0.1 ), radius: 8 , y: 4 ) // Elevated appearance .shadow(radius: 2 , y: 1 ) .shadow(radius: 8 , y: 4 ) Quick Start Component import SwiftUI struct FeatureCard : View { let title: String let description: String let systemImage: String var body: some View { HStack (spacing: 16 ) { Image (systemName: systemImage) .font(.title) .foregroundStyle(.blue) .frame(width: 44 , height: 44 ) .background(.blue.opacity( 0.1 ), in: Circle ()) VStack (alignment: .leading, spacing: 4 ) { Text (title) .font(.headline) Text (description) .font(.subheadline) .foregroundStyle(.secondary) .lineLimit( 2 ) } Spacer () Image (systemName: "chevron.right" ) .foregroundStyle(.tertiary) } .padding() .background(.background, in: RoundedRectangle (cornerRadius: 12 )) .shadow(color: .black.opacity( 0.05 ), radius: 4 , y: 2 ) } } Best Practices Use Semantic Colors : Always use .primary , .secondary , .background for automatic light/dark mode support Embrace SF Symbols : Use system symbols for consistency and automatic accessibility Support Dynamic Type : Use semantic fonts ( .body , .headline ) instead of fixed sizes Add Accessibility : Include .accessibilityLabel() and .accessibilityHint() modifiers Use Safe Areas : Respect safeAreaInset and avoid hardcoded padding at screen edges Implement State Restoration : Use @SceneStorage for preserving user state Support iPad Multitasking : Design for split view and slide over Test on Device : Simulator doesn't capture full haptic and performance experience Common Issues Layout Breaking : Use .fixedSize() sparingly; prefer flexible layouts Performance Issues : Use LazyVStack / LazyHStack for long scrolling lists Navigation Bugs : Ensure NavigationLink values are Hashable Dark Mode Problems : Avoid hardcoded colors; use semantic or asset catalog colors Accessibility Failures : Test with VoiceOver enabled Memory Leaks : Watch for strong reference cycles in closures