Result builders (formerly known as function builders) are a powerful Swift feature that enables you to create elegant domain-specific languages (DSLs). They're the magic behind SwiftUI's declarative syntax and can be used to build your own custom DSLs. This is an advanced Swift feature (requires Swift 5.4+; platform availability depends on the APIs you use, such as SwiftUI). Familiarity with generics and protocols is recommended.
Swift 6.2 added a small concurrency API that solves a very specific problem: sync code sometimes needs to start async work, but still needs the first state change to happen before the caller continues.
Reactive programming became popular because it solved a real problem. Apple platforms had many asynchronous and event-driven APIs, but they lacked a unified model for composing them. RxSwift, ReactiveSwift and Combine offered that model, and for many years, that made them feel like the missing piece in iOS architecture.
Before an iOS app can receive remote notifications, we first need to register the app with Apple Push Notification service (APNs). This process includes requesting notification permission from the user, registering with APNs, and handling the generated device token.
In this article, we'll look at how to set up push notification registration in a SwiftUI app.
The real iOS problem is not “how do we make colors stronger?”It is: how do we make the frame feel richer without breaking the image?
Before Swift Concurrency, it was possible to accidentally access mutable state from multiple threads at the same time. These bugs were notoriously difficult to reproduce because they depended on timing and thread scheduling. An application might work perfectly for months and then suddenly crash or corrupt data in production.
When a crash happens deep inside concurrent code, the first question is always: which task did this? Pthreads had names, Grand Central Dispatch had queue labels — they show up in stack traces, in Instruments lanes, in debugger output. Swift Concurrency had none of that until SE-0469, implemented in Swift 6.2.
While building and testing a macOS app locally, values stored in UserDefaults remain between launches. This includes data stored using the UserDefaults APIs directly or data persisted via the SwiftUI's @AppStorage property wrapper. But it's often useful to clear saved values to test onboarding, restore default settings, and reproduce a fresh app state.
A video enhancement feature usually starts with a product sentence: “Can we make playback look sharper?”The engineering answer should not start with “add a filter.” It should start with a boundary question: where in the playback pipeline are we allowed to touch the frame?
Recently, I was asked an interesting question. If the purpose of an actor is to protect mutable state, is a stateless actor pointless?
At first, I thought it was an easy answer. Actors exist to define a little, protective bubble around state. They "isolate" data away from any unsafe accesses. An actor that has nothing to isolate seems like a strange thing.
Can such an arrangement serve a purpose?
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