Hi, my name is Donny

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. Consider the following example: class SearchService: ObservableObject { @Published var results: [SearchResult] = [] @Published var query: String? } Let me start by acknowledging that yes, this object can be written with a...

If you want to make sure that your code adopts Swift concurrency as correctly as possible in Swift 5.7, it's a good idea to enable the Strict Concurrency Checking (SWIFT_STRICT_CONCURRENCY) 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 list of settings that is shown (Basic is the default) and type Strict Concurrency in the searchbar to find the Strict Concurrency Checking build setting. The...

One of the goals of the Swift team with Swift’s concurrency features is to provide a model that allows developer to write safe code by default. This means that there’s a lot of time and energy invested into making sure that the Swift compiler helps developers detect, and prevent whole classes of bugs and concurrency issues altogether. One of the features that helps you prevent data races (a common concurrency issue) comes in the form of actors which I’ve written...

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 a sample of your code on Twitter as a Github Gist. Dear reader, if you've found this page you're probably encountering the error from the...

Swift 5.7 introduces many new features that involve generics and protocols. In this post, we're going to explore an extremely powerful new features 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 help you write better code. If your familiar with Swift 5.6 or earlier, you might know that protocols with associated types have always been somewhat...

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 you need to know about the similarities and differences between these two keywords. We'll start with an introduction of each keyword, and then you'll learn...