Migrating to Swift 6 Tutorial

The migration path to Swift 6 is now a lot smoother, with lots more guideposts. Work through this tutorial to find out how much easier it’s become. By Audrey Tam.

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Contents

Migrating to Swift 6 Tutorial

15 mins

From Single-Thread to Concurrency
Isolation Domains
Migrating to Swift 6.2
Swift.org Migration Guide
Xcode 26 Default Settings
Getting Started
Migrating TheMet to Swift 6.2
Crossing Isolation Boundaries
Sendable Types
Protocols
Adding Concurrency to TheMet
Where To Go From Here?

Contents

Where To Go From Here?

Download the final project using Download materials at the top or bottom of this article.

Watch the WWDC 2025 videos on concurrency, especially the Code-along, where Sima presents an excellent exposition of how to implement the three phases of development:

Code-along: Elevate an app with Swift concurrency
Explore concurrency in SwiftUI
Embracing Swift concurrency

To revisit async/await and other Swift 5.5 concurrency features:

async/await in SwiftUI
AsyncSequence & AsyncStream Tutorial for iOS
Modern Concurrency in Swift (updated to Swift 5.8)

Contents

Migrating to Swift 6 Tutorial

Where To Go From Here?

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