Swift Fundamentals

Comprehensive guide to Swift 6.x language features, best practices, macros, and project configuration for iOS 26 and macOS Tahoe development.

Prerequisites

• Xcode 26+ or Swift 6.x toolchain
• macOS 15.5+ (Sequoia) for full iOS 26 support

Swift Version Check

swift --version
# Swift version 6.x

Swift 6.x Key Features