Deadlocks in Swift can make your app hang, causing a frustrating situation for both you and your users. Your app becomes unresponsive, and you can often only solve it by restarting the app. While features like actors reduce the number of deadlocks you’ll run into, there’s still a high chance of experiencing deadlocks. Deadlocks can …
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Variable WidgetBundle configuration based on conditions
The WidgetBundle protocol inside WidgetKit allows you to configure supported widgets for your apps. Whenever you add one or more widgets, you’ll have to add a @main struct conforming to this protocol. Like SwiftUI views, you’ll return the supported widgets inside the body computed property. You’ll not have issues with a consistent set of supported …
Accessibility in SwiftUI explained for UIKit developers
Adding accessibility support in SwiftUI will be more approachable for you compared to UIKit. But still, if you’ve been sharpening your UIKit skills for years, it takes a while to get your head around the new declarative/reactive way of doing things. It is an entirely different mental model, and it takes some getting used to. …
VoiceOver navigation improvement tips for SwiftUI apps
VoiceOver navigation support in your apps comes with the same requirements as navigating through touch controls. When navigating apps with standard touch controls, we tend to dislike apps that feel cluttered or make us do many interactions to achieve something. We’d probably say such an app does not offer a good user experience. The same …
@ViewBuilder usage explained with code examples
The @ViewBuilder attribute is one of the few result builders available for you to use in SwiftUI. You typically use it to create child views for a specific SwiftUI view in a readable way without having to use any return keywords. I encourage you to read my article Result builders in Swift explained with code …
Faster StoreKit testing by syncing in-app purchase products
StoreKit testing in the Simulator allows you to speed up testing in-app purchases for your app. You can test in-app purchases in Xcode by generating a StoreKit configuration file containing the available products for your app. You’ll be able to purchase products without connecting to App Store servers, without an internet connection, and you’ll be …
Shared with You implementation and testing explained
iOS 16 introduced Shared with You allowing you to showcase content shared in Messages inside your app. Users can find back content they would otherwise lose in the history of a long conversation. Apps like Photos, Music, and Podcasts have already implemented support, and now it’s time to add support to your apps. Shared with …
Sendable and @Sendable closures explained with code examples
Sendable and @Sendable are part of the concurrency changes that arrived in Swift 5.5 and address a challenging problem of type-checking values passed between structured concurrency constructs and actor messages. Before diving into the topic of sendables, I encourage you to read up on my articles around async/await, actors, and actor isolation. These articles cover …
UIViewRepresentable explained to host UIView instances in SwiftUI
Adopting the UIViewRepresentable protocol allows you to host UIView instances in SwiftUI. Your SwiftUI code is converted to UIKit views behind the scenes. SwiftUI requires you to declare the view representation, but the underlying SwiftUI implementation will optimize how final views are drawn on the screen. You can use a similar technique to make SwiftUI …
URLSessionConfiguration: Exploring opt-in configurations
URLSessionConfiguration can be used to initialize URLSession instances in Swift. While in most cases, you’ll likely use the default configuration, you’ll also have the opportunity to create a custom configuration with non-default settings. The default URLSessionConfiguration uses standard configurations that work best for most apps. However, no configuration fits all, and you can likely optimize …