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Enum explained in-depth with code examples in Swift

Enum usage in Swift: If case, guard case, fallthrough, and the CaseIteratable protocol. These are all terms which could sound familiar if you've worked a lot with enums in Swift. An enumeration defines a common type for a group of related values and enables you to work with those values ...

OptionSet in Swift explained with code examples

OptionSet in Swift allows you to define a set of options for configurations. It's the Swift variant of the well-known NS_OPTIONS in Objective-C and it's used throughout the standard libraries. A set of options is often confused by a set of enum cases, but they're not the same. While you ...

@dynamicCallable in Swift explained with code examples

It's all in the name: @dynamicCallable in Swift allows you to dynamically call methods using an alternative syntax. While it's primarily syntactic sugar, it can be good to know why it exists and how it can be used. We covered @dynamicMemberLookup earlier, allowing us to express member lookup rules in ...

Binary Targets in Swift Package Manager

Binary Targets in Swift Package Manager (SPM) allow packages to declare xcframework bundles as available targets. The technique is often used to provide access to closed-source libraries and can improve CI performance by reducing time spent on fetching SPM repositories. Both downs and upsides are essential to consider when adding ...

Result builders in Swift explained with code examples

Result builders in Swift allow you to build up a result using 'build blocks' lined up after each other. They were introduced in Swift 5.4 and are available in Xcode 12.5 and up. Formerly known as function builders, you've probably already used them quite a bit by building a stack ...

Getting started with Unit Tests in Swift

Unit tests in programming languages ensure that written code works as expected. Given a particular input, you expect the code to come with a specific output. By testing your code, you're creating confidence for refactors and releases, as you'll ensure the code works as expected after running your suite of ...

Announcing the SwiftLee Talent Collective

Today I'm excited to introduce you to the SwiftLee Talent Collective — an initiative to connect engineers with exciting companies. One of the most frequently asked questions I get relates to how to find a new job or how to make the next career step. I wrote about Swift Jobs: ...

Alternate App Icon Configuration in Xcode

Adding alternate app icons to your app allows users to customize their home screen with an app icon that fits their style. An alternative icon could be a dark or light-mode version of the original icon or a collection of completely different styles. iOS 10.3 was the first version to ...

Never keyword in Swift: return type explained with code examples

The Never type in Swift allows you to tell the compiler about an exit point in your code. It's a type with no values that prevents writing unuseful code by creating dead ends. While the type Never on its own might be a little unknown, you might have been using ...

Deadlocks in Swift explained: detecting and solving

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 ...

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 ...

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 ...