Swift Development

Prerequisites

• macOS with Xcode 15+ installed (Xcode 16+ for Swift 6)
• Xcode Command Line Tools: xcode-select --install
• Verify: xcodebuild -version and swift --version

Quick Start

New Swift Package

# Use the included script for full setup
./scripts/new_package.sh MyLibrary --type library --ios --macos

# Or manually
swift package init --type library --name MyLibrary

Build and Test

# SPM packages
swift build
swift test

# Xcode projects
xcodebuild -workspace App.xcworkspace -scheme App \
    -destination 'platform=iOS Simulator,name=iPhone 15' build

# Use included script for common options
./scripts/run_tests.sh --parallel --coverage

Format and Lint

# Use included script
./scripts/format_and_lint.sh Sources/

# Check mode (CI)
./scripts/format_and_lint.sh --check

Simulator Management

# Use included script
./scripts/simulator.sh list
./scripts/simulator.sh boot "iPhone 15"
./scripts/simulator.sh screenshot
./scripts/simulator.sh dark

---

Core Workflows

Building iOS Apps

# Debug build for simulator
xcodebuild -workspace App.xcworkspace -scheme App \
    -destination 'platform=iOS Simulator,name=iPhone 15' \
    build

# Release archive
xcodebuild archive \
    -workspace App.xcworkspace -scheme App \
    -archivePath ./build/App.xcarchive \
    -configuration Release

# Export IPA (use templates from assets/ExportOptions/)
xcodebuild -exportArchive \
    -archivePath ./build/App.xcarchive \
    -exportPath ./build/export \
    -exportOptionsPlist assets/ExportOptions/app-store.plist

Testing

# All tests
xcodebuild test -workspace App.xcworkspace -scheme App \
    -destination 'platform=iOS Simulator,name=iPhone 15'

# Specific test
xcodebuild test -only-testing:AppTests/MyTestClass/testMethod

# With coverage
xcodebuild test -enableCodeCoverage YES \
    -resultBundlePath ./TestResults.xcresult

App Installation

# Install on booted simulator
xcrun simctl install booted ./Build/Products/Debug-iphonesimulator/App.app

# Launch
xcrun simctl launch booted com.company.app

---

Official Documentation

Reference Links (for humans)

These are Apple's official documentation links for manual browsing:

Resource	URL
Swift Documentation	https://developer.apple.com/documentation/swift
SwiftUI	https://developer.apple.com/documentation/swiftui
Swift Concurrency	https://developer.apple.com/documentation/swift/concurrency
Swift Testing	https://developer.apple.com/documentation/testing

Note: Apple's documentation sites are JavaScript SPAs and cannot be fetched programmatically with WebFetch.

WebFetch-Compatible Sources

Use these GitHub-based sources for live documentation fetching:

Resource	URL
Swift Testing	https://github.com/apple/swift-testing
Swift Evolution Proposals	https://github.com/apple/swift-evolution/tree/main/proposals
Swift Compiler Docs	https://github.com/apple/swift/tree/main/docs
Swift Standard Library	https://github.com/apple/swift/tree/main/stdlib
Swift Async Algorithms	https://github.com/apple/swift-async-algorithms
Swift Collections	https://github.com/apple/swift-collections

When to Fetch Documentation

Use WebFetch to retrieve documentation from GitHub in these situations:

1. Swift Testing: When you need details on @Test, #expect, #require, traits, or parameterized tests
2. Swift Evolution: When checking accepted proposals for new language features
3. Framework Details: When implementing features from Apple's open-source Swift packages
4. Uncertainty: When you're unsure about current API patterns or best practices

How to fetch: Use WebFetch with GitHub URLs:

• README: https://github.com/apple/swift-testing
• Raw markdown: https://raw.githubusercontent.com/apple/swift-testing/main/README.md
• Specific docs: https://github.com/apple/swift-evolution/blob/main/proposals/0409-access-level-on-imports.md

Example prompt for WebFetch: "Extract the main features, macros, and usage examples from this documentation"

---

Reference Files

Detailed documentation for specific topics:

Topic	File
SwiftUI patterns	references/swiftui-patterns.md
Testing patterns	references/testing-patterns.md
Swift 6 concurrency	references/concurrency.md
Architecture patterns	references/architecture.md
Best practices	references/best-practices.md
Swift Package Manager	references/spm.md
xcodebuild commands	references/xcodebuild.md
Simulator control	references/simctl.md
Code signing	references/code-signing.md
CI/CD setup	references/cicd.md
Troubleshooting	references/troubleshooting.md

---

Included Scripts

Script	Purpose
scripts/new_package.sh	Create new Swift package with config files
scripts/run_tests.sh	Run tests with common options
scripts/format_and_lint.sh	Format and lint Swift code
scripts/simulator.sh	Quick simulator management

---

Asset Templates

Asset	Purpose
assets/Package.swift.template	Swift package template
assets/.swiftformat	SwiftFormat configuration
assets/.swiftlint.yml	SwiftLint configuration
assets/ExportOptions/	Archive export plist templates

---

Quick Reference

Essential Commands

Task	Command
Build package	swift build
Build release	swift build -c release
Run tests	swift test
Update deps	swift package update
List simulators	xcrun simctl list devices
Boot simulator	xcrun simctl boot "iPhone 15"
Install app	xcrun simctl install booted ./App.app
Format code	swiftformat .
Lint code	swiftlint

Common Destinations

# iOS Simulator
-destination 'platform=iOS Simulator,name=iPhone 15'

# macOS
-destination 'platform=macOS'

# Generic iOS (for archives)
-destination 'generic/platform=iOS'

---