Concurrency

Swift offers migration tooling to help you migrate existing code to new upcoming features. Swift Evolution proposals on GitHub will mention an upcoming feature flag that you can use to opt in early. For most of these features, it's likely that they'll become the default in the future. Therefore, it's ...

App Store Rejections, your UI freezing for 5 seconds, and migration projects taking months instead of days (even if you’ve been writing Swift for years). These could all be the result of common mistakes that are easy to make when writing Swift Concurrency code. I've created a 65+ lessons course, ...

Async await is part of the new structured concurrency changes that arrived in Swift 5.5 during WWDC 2021. Concurrency in Swift means allowing multiple pieces of code to run at the same time. This is a very simplified description, but it should give you an idea already of how important ...

Swift Concurrency introduced the concept of a global actor among async/await and tasks. The most common one is likely @MainActor, which I already explained in depth. However, you can also create custom global actors. Although they have existed for a few years, it remains unclear for many developers when and ...

Many developers are migrating from Combine to Swift Concurrency. Swift Concurrency is here to stay, and Combine hasn't received updates in recent years. While Combine is a mature framework that may not need many updates, it's clear that the Swift team is focusing on a future with Swift Concurrency. When ...

Are Threads the same as Tasks in Swift Concurrency? You may wonder if you're used to writing Swift or Objective-C using Grand Central Dispatch (GCD) and traditional APIs. A so-called threading mindset has helped us develop apps that work with asynchronous functions for years. Modern concurrency uses Swift Concurrency and ...

Swift offers several solutions to lock access to mutable content and prevent so-called data races. Locks like NSLock, DispatchSemaphore, or a serial DispatchQueue are a popular choice for many. Some articles compare their performance and tell you which one works best, but I'd like to introduce you to a modern ...

A Swift Concurrency Course that helps you learn all the fundamentals of Swift Concurrency and migrate your projects smoothly to Swift 6 strict concurrency checking. It can be intimidating to start migrating existing projects to Swift 6 and learn about async/await, sendable, and actors simultaneously. A graceful learning process can ...

Default Actor Isolation in Swift 6.2 allows you to run code on the @MainActor by default. This new Swift compiler setting helps improve the approachability of data-race safety, which was set as a goal for the Swift team in their February 2025 vision document. While new projects are set to ...

Swift 6.2 introduced many changes during WWDC 2025, including a new @concurrent attribute we need when working with Swift Concurrency. You might have read that we'll be able to @MainActor all the things now, which also means we need a way out of the @MainActor for asynchronous functions. For the ...

Swift 6.2 is the upcoming release of Apple's native language. It's currently in active development, and as you know from my weekly Swift Evolution updates, many proposals are currently being processed. While many of you usually await a new Xcode release before jumping into new changes, I think knowing what's ...