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 …
App Store Connect API SDK in Swift: Creating Developer Tools
The new App Store Connect API was announced during WWDC 2018 and made it possible to write applications for App Store Connect. You can use the API to fetch metadata for apps, TestFlight builds, download sales reports, and much more. Apple added new endpoints over the years, with most recently the release of their 2.0 …
Generics in Swift explained with code examples
Generics in Swift allows you to write generic and reusable code, avoiding duplication. A generic type or function creates constraints for the current scope, requiring input values to conform to these requirements. You’ve probably been using generic implementations already since they’re all over the place in the Swift standard library. Though, using them in your …
Existential any in Swift explained with code examples
Existential any allows you to define existential types in Swift by prefixing a type with the any keyword. In short, an existential means “any type, but conforming to protocol X.” Any and AnyView have different purposes, which I explain in my article AnyObject, Any, and any: When to use which?. In this article, I’ll explain …
Some keyword in Swift: Opaque types explained with code examples
The some keyword in Swift declares opaque types, and Swift 5.1 introduced it with support for opaque result types. Many engineers experience working with opaque types for the first time when writing a body of a SwiftUI view. Though, it’s often unclear what some keyword does and when to use them in other places. With …
Using NavigationLink programmatically based on binding in SwiftUI
NavigationLink in SwiftUI allows pushing a new destination view on a navigation controller. You can use NavigationLink in a list or decide to push a view programmatically. The latter enables you to trigger a new screen from a different location in your view. Allowing to push a new screen onto a navigation stack is as …