What's new in Swift and SwiftUI (WWDC 2026)

WWDC 2026 brought significant updates to the Swift language and SwiftUI framework. This comprehensive overview covers:

Swift language:

• New macros and expanded macro capabilities
• Concurrency improvements and stricter Sendable enforcement
• Enhancements to the type system

SwiftUI:

• iOS 27-specific features (toolbars, sectioned queries, ResultsObserver)
• Animation improvements
• Performance optimizations

Tooling:

• Xcode 27 updates (agentic coding assistance, Device Hub)
• Better preview and debugging workflows