Swift protocols comes with trade-offs at every turn. Understanding them is the key to a successful design.

Building a test clock in Swift sounds simple. Making it deterministic under @MainActor is where the real concurrency model reveals itself.

Whenever you consider creating a scrollable screen in SwiftUI, you might think of using a List. However, it’s not always the best choice. Lists are great for displaying uniform data. For anything else, a ScrollView with a lazy stack is almost always the best…

Greetings, traveler! Performance work in mobile apps often starts with a familiar question: why does this screen feel slow. The answer rarely sits in one place. It might be in the network, in the way the UI updates, in how data flows through the app, or in…

Greetings, traveler! In larger iOS applications, communication between features often becomes harder than the feature itself. A service finishes an operation, a coordinator needs to react, several screens may need to refresh, and passing every dependency…

Greetings, traveler! Feature flags are a foundational tool for modern mobile development. They allow teams to control behavior at runtime, roll out features gradually, run experiments, and decouple deployment from release. In iOS applications, a well-designed…

Most Swift developers never look beyond the syntax—but what if your code could inspect itself at runtime? This extract from Swift Internals explores Mirror, reflection, and @dynamicMemberLookup: the metaprogramming tools that let you build generic inspectors…

A theoretical deep-dive into how the internet happens via your iPhone

Learn how to use Apple’s Accelerate framework in Swift for high-performance vector math, DSP, matrix operations, FFT, and numerical computing with practical examples and deep explanations.

Learn how to use ContentUnavailableView in SwiftUI to build beautiful empty states, search placeholders, and error screens with practical examples and best practices.

Professional iOS Engineer specializing in SwiftUI, VisionOS, and modern Apple platforms. Expert in HealthKit, tvOS, watchOS and even some VisionOS development with 85+ technical articles and comprehensive portfolio.

Why chained Text.kerning modifiers may or may not be equivalent across SDK semantics

SwiftUI apps often need to perform async operations that will throw errors when things go wrong. This post shows how you can present aler...

An iOS sheet defaults to covering around half the screen, and while you can specify custom detents, it’s not enough. This article shows y...

With the latest release of corecrypto, we’re publishing our implementations of quantum-secure ML-KEM and ML-DSA algorithms, along with the mathematical proofs we built to assure they are faithful to the FIPS 203 and FIPS 204 specifications. To advance the…

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Mock iOS…

Building a floating card component using iOS 26’s safeAreaBar with an iOS 18 fallback

You may think about defer keyword as one of the most ambiguous language features in Swift, but it is very useful in some cases. You can use it deliberately, and it will give you safety. This week we will talk about some best practices of using defer in Swift.

Monads don't have to be mysterious. Using a book warehouse analogy, this post explains what a monad is, what flatMap does, and how to spot one in the wild.