Recent articles

Swift’s async await syntax heavily relies on a concept called Structured Concurrency. Structured concurrency describes the relationship between tasks that perform concurrent work. Specifically, it defines the relationship between parent and child tasks in Swift. Structured Concurrency finds its roots in the fork join model which is a model that stems from the sixties. In […]

Every once in a while I find myself writing about or experimenting with web sockets. As an iOS developer, I’m not terribly familiar with setting up and programming servers that leverage web sockets beyond some toy projects in college. Regardless, I figured that since I have some posts that cover web sockets on my blog, […]

In iOS 13, we gained the ability to easily send and receive data using web sockets through URLSession. With async/await, we gained the ability to fetch data from servers using the await keyword and we can iterate over asynchronous sequences using async for loops. We can even read data from a URL one line at […]

In an earlier post, I wrote about different ways that you can bridge your existing asynchronous code over to Swift’s new Concurrency system that leverages async / await. The mechanisms shown there work great for code where your code produces a single result that can be modeled as a single value. Since writing this post […]

Sometimes in SwiftUI apps I’ll find that I have a model with an optional value that I’d like to pass to a view that requires a non optional value. This is especially the case when you’re using Core Data in your SwiftUI apps and use auto-generated models. These models will usually include optional values for […]

If you want to make sure that your code adopts Swift concurrency as correctly as possible in Swift 5.x, it’s a good idea to enable the Strict Concurrency Checking (SWIFT_STRICT_CONCURRENCY) flag in your project. To do this, select your project’s target and navigate to the Build Settings tab. Make sure you select All from the […]

Sendability is an important feature of Swift Concurrency. It’s how the compiler determines whether code can safely be accessed from multiple concurrency contexts. In this post you’ll learn everything you need to know about why state sometimes needs to be Sendable.

UPDATE FOR XCODE 14.1: This issue appears to have been partially fixed in Xcode 14.1. Some occurences of the warning are fixed, others aren’t. In this post I’m collecting situations me and others run into and track whether they are fixed or not. If you have another sample that you think is similar, please send […]

Swift 5.7 introduced many new features that involve generics and protocols. In this post, we’re going to explore an extremely powerful new feature that’s called "primary associated types". By the end of this post you will know and understand what primary associated types are, and why I think they are extremely important and powerful to […]

Protocols are an extremely important part in the Swift language, and in recent updates we’ve received some new capabilities around protocol and generics that allow us to be much more intentional about how we use protocols in our code. This is done through the any and some keywords. In this post, you will learn everything […]