Hi, my name is Donny

I'm a curious, passionate iOS Developer from The Netherlands who loves learning and sharing knowledge.

Take a look at my books

Practical Swift Concurrency cover

Practical Swift Concurrency

Learn everything you need to know to make optimal use of Swift Concurrency in your applications. This book covers everything from awaiting asynchronous method calls to building your own highly concurrent systems. It’s a great introduction for those looking to familiarize themselves with everything Swift Concurrency has to offer.

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Practical Combine

Practical Combine is a book aimed at intermediate to advanced developers who want to learn more about Apple's Combine framework. This book takes you all the way from the basics to building custom Combine publishers using Practical, useful examples that you can start using immediately.

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Practical Core Data

Practical Core Data is for intermediate to advanced developers who want to learn more about Core Data. Whether you're new to Core Data, or tried using it years ago, you'll find that Practical Core Data introduces you to all the essentials to get you up and running with the framework.

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Recent articles

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What is dependency injection in Swift?

October 11, 2024

Code has dependencies. It’s something that I consider universally true in one way or another. Sometimes these dependencies are third party dependencies while other times you’ll have objects that depend on other objects or functionality to function. Even when you write a function that should be called with a simple input like a number, that’s a dependency. We often don’t really consider the small things the be dependencies and this post will not focus on that at all. In an...

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Getting started with Mesh Gradients on iOS 18

September 25, 2024

With iOS 18, we have the possibility to create mesh gradients. Mesh gradients are a really nice way to create very cool UI effects. In this post, we're going to explore exactly what mesh gradients are, how we can use them, and how we can even animate them to look really cool. We’ll start off looking at how we can create a mesh gradient. We're going to take a look at how it more or less works, and then we'll...

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Animating SF Symbols on iOS 18

September 4, 2024

Over the years, Apple has been putting tons of work into the SF Symbols catalog. With SF Symbols, we’re able to leverage built-in iconography that will look familiar to users while also fitting into the Apple ecosystem very nicely. The fact that there’s thousands of symbols to choose from makes it a highly flexible and powerful catalog of icons that, in my opinion, should be every designer and developer’s first choice when they’re looking for visual components to add to...

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Solving "Value of non-Sendable type accessed after being transferred; later accesses could race;"

August 23, 2024

Once you start migrating to the Swift 6 language mode, you'll most likely turn on strict concurrency first. Once you've done this there will be several warings and errors that you'll encounter and these errors can be confusing at times. I'll start by saying that having a solid understanding of actors, sendable, and data races is a huge advantage when you want to adopt the Swift 6 language mode. Pretty much all of the warnings you'll get in strict concurrency...

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Setting the Swift Language mode for an SPM Package

August 21, 2024

When you create a new Swift Package in Xcode 16, the Package.swift contents will look a bit like this: // swift-tools-version: 6.0 // The swift-tools-version declares the minimum version of Swift required to build this package. import PackageDescription let package = Package( name: "AppCore", products: [ // Products define the executables and libraries a package produces, making them visible to other packages. .library( name: "AppCore", targets: ["AppCore"]), ], targets: [ // Targets are the basic building blocks of a package,...

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Void' passed as a strongly transferred parameter"">Solving "Task-isolated value of type '() async -> Void' passed as a strongly transferred parameter"

August 21, 2024

Once you start migrating to the Swift 6 language mode, you'll most likely turn on strict concurrency first. Once you've done this there will be several warings and errors that you'll encounter and these errors can be confusing at times. I'll start by saying that having a solid understanding of actors, sendable, and data races is a huge advantage when you want to adopt the Swift 6 language mode. Pretty much all of the warnings you'll get in strict concurrency...

Void' passed as a strongly transferred parameter"">Read more...