Recent articles

iOS 14 introduced a new way to build apps where you no longer need an App- and SceneDelegate for SwiftUI apps. Learn how to handle deeplinks for these apps in this article. On iOS, it’s possible to send users from one app to the next or to send them from a webpage into an app. […]

One of the features that got screen time at WWDC 2018 but never really took off is the signposting API, also known as os_signpost. Built on top of Apple’s unified logging system, signposts are a fantastic way for you to gain insight into how your code behaves during certain operations. In this post, I will […]

There are many reasons for code to function suboptimally. In a post, I have shown you how to use the Time Profiler to measure the time spent in each method in your code, and how to analyze the results. While a lot of performance-related problems can be discovered, analyzed and fixed using these tools, memory […]

Every once in a while we run into performance problems. One thing you can do when this happens is to measure how long certain things in your code take. You can do this using signposts. However, there are times when we need deeper insights in our code. More specifically, sometimes you simply want to know […]

Swift allows us to use a static prefix on methods and properties to associate them with the type that they’re declared on rather than the instance. We can also use static properties to create singletons of our objects which, as you have probably heard before is a huge anti-pattern. So when should we use properties […]

If you’re using SwiftUI to build your apps, you will have noticed that your view’s body property is of type some View. The some keyword was introduced alongside SwiftUI and it’s part of a feature called opaque result types (SE-0244). In this post, we’ll take a look at what the some keyword is exactly, which […]

Whenever we write code, we want our code to be well-designed. We want it to be flexible, elegant and safe. We want to make sure that Swift’s type system and the compiler catch as many of our mistakes as possible. It’s especially interesting how Swift’s type system can help us avoid obvious errors. For example, […]

When your app shows images from the network in a table view or collection view, you need to load the images asynchronously to make sure your list scrolls smoothly. More importantly, you’ll need to somehow connect the image that you’re loading to the correct cell in your list (instead of table view or collection view, […]

Lots of iOS developers eventually run into code that calls upon DispatchQueue.main. It’s often clear that this is done to update the UI, but I’ve seen more than a handful of cases where developers use DispatchQueue.main as an attempt to get their code to work if the UI doesn’t update as they expect, or if […]

If you’re working on an app that requires access to a user’s location, even when your user has sent your app to the background, you might have noticed that when you ask the user for the appropriate permission, iOS 13 shows a different permissions dialog than you might expect. In iOS 12 and below, when […]