https://slekens.dev/en/blog/ iOS and macOS development with Swift, by Slekens. en Tue, 23 Jun 2026 16:27:42 GMT https://slekens.dev/en/blog/wwdc-2026-part-4-for-devs/ https://slekens.dev/en/blog/wwdc-2026-part-4-for-devs/ Sun, 21 Jun 2026 10:00:00 GMT Part four of the WWDC 2026 developer recap: visionOS 27 and RealityKit, App Intents as Siri's new contract, StoreKit updates, and the automatic adoption of Liquid Glass. WWDC visionOS App Intents iOS https://slekens.dev/en/blog/narcisse-1-2-0-available/ https://slekens.dev/en/blog/narcisse-1-2-0-available/ Wed, 17 Jun 2026 18:00:00 GMT Narcisse 1.2.0 is here: a full visual redesign, skin undertone and 9 hair colors, an «I own it» wishlist, a free widget, and dark mode. Apps Narcisse iOS https://slekens.dev/en/blog/wwdc-2026-part-3-for-devs/ https://slekens.dev/en/blog/wwdc-2026-part-3-for-devs/ Sun, 14 Jun 2026 15:00:00 GMT Part three of the WWDC 2026 developer recap: the Agent Skills Xcode 27 ships with (and how to build your own), plus the official SwiftUI API names from Apple's guide. WWDC Xcode SwiftUI Swift https://slekens.dev/en/blog/wwdc-2026-part-2-for-devs/ https://slekens.dev/en/blog/wwdc-2026-part-2-for-devs/ Sun, 14 Jun 2026 09:00:00 GMT Part two of the WWDC 2026 developer recap: the Foundation Models LanguageModel protocol, Xcode 27's dual-engine agents, and more SwiftUI/SwiftData details. WWDC Swift SwiftUI AI https://slekens.dev/en/blog/wwdc-2026-news-for-devs/ https://slekens.dev/en/blog/wwdc-2026-news-for-devs/ Tue, 09 Jun 2026 00:00:00 GMT A dev-focused recap of WWDC 2026: what's new in SwiftUI, Swift 6.4, Xcode 27, and the new AI APIs (App Intents and Foundation Models). Preliminary info. WWDC Swift SwiftUI Xcode https://slekens.dev/en/blog/poketracker-10-cicd-en/ https://slekens.dev/en/blog/poketracker-10-cicd-en/ Sat, 30 May 2026 00:00:00 GMT Final part of the PokeTracker series: we set up a CI/CD pipeline with GitHub Actions that builds and tests the app on every push. Plus the repository. Swift CI/CD GitHub Actions iOS https://slekens.dev/en/blog/poketracker-09-testing-en/ https://slekens.dev/en/blog/poketracker-09-testing-en/ Fri, 29 May 2026 00:00:00 GMT Part 9 of the PokeTracker series: we write unit tests with the new Swift Testing framework using Mocks, @Suite, and #expect. Swift Testing Unit Tests iOS https://slekens.dev/en/blog/poketracker-08-viewmodel-en/ https://slekens.dev/en/blog/poketracker-08-viewmodel-en/ Thu, 28 May 2026 00:00:00 GMT Part 8 of the PokeTracker series: we build PokemonListViewModel with the new @Observable macro, handling pagination, search, filters, and the cache-first logic. Swift SwiftUI Observable iOS https://slekens.dev/en/blog/poketracker-07-image-cache-en/ https://slekens.dev/en/blog/poketracker-07-image-cache-en/ Wed, 27 May 2026 00:00:00 GMT Part 7 of the PokeTracker series: we implement a two-level image cache system — NSCache in memory and FileManager on disk — using Swift actors. Swift Cache actor iOS https://slekens.dev/en/blog/poketracker-06-swiftdata-en/ https://slekens.dev/en/blog/poketracker-06-swiftdata-en/ Tue, 26 May 2026 00:00:00 GMT Part 6 of the PokeTracker series: we implement the @Model models, the data service, and the cache-first strategy so the app works without a network connection. Swift SwiftData Persistencia iOS https://slekens.dev/en/blog/poketracker-05-domain/ https://slekens.dev/en/blog/poketracker-05-domain/ Mon, 25 May 2026 00:00:00 GMT Part 5 of the PokeTracker series: we create the app's own models and the Use Cases that convert DTOs into data ready for the interface. Swift Arquitectura Domain iOS https://slekens.dev/en/blog/poketracker-04-repository-en/ https://slekens.dev/en/blog/poketracker-04-repository-en/ Sun, 24 May 2026 00:00:00 GMT Part 4 of the PokeTracker series: what the Repository Pattern is, why we use it, and how we implement PokemonRepository. Swift Arquitectura Repository iOS https://slekens.dev/en/blog/poketracker-03-dtos-en/ https://slekens.dev/en/blog/poketracker-03-dtos-en/ Sat, 23 May 2026 00:00:00 GMT Part 3 of the PokeTracker series: what DTOs are, why we don't use API data directly, and how we define the contract with PokéAPI. Swift DTOs Networking iOS https://slekens.dev/en/blog/poketracker-02-network-layer/ https://slekens.dev/en/blog/poketracker-02-network-layer/ Fri, 22 May 2026 00:00:00 GMT Part 2 of the PokeTracker series: we build the HTTP client, define endpoints with an enum, and create typed network errors. Swift Networking async/await iOS https://slekens.dev/en/blog/poketracker-01-architecture/ https://slekens.dev/en/blog/poketracker-01-architecture/ Thu, 21 May 2026 00:00:00 GMT First post in the PokeTracker series: what we're building, how we structure the project, and why we organize the code into layers. Swift SwiftUI Arquitectura iOS https://slekens.dev/en/blog/conditional-compilation-in-swift/ https://slekens.dev/en/blog/conditional-compilation-in-swift/ Fri, 15 May 2026 00:00:00 GMT What #if is in Swift, how it differs from a regular if, and when to use it: DEBUG, platforms, simulator, custom flags, and the difference with assert(). Swift macOS Xcode https://slekens.dev/en/blog/generics-in-swift/ https://slekens.dev/en/blog/generics-in-swift/ Fri, 15 May 2026 00:00:00 GMT What generics are, how to write them, when to constrain types with Comparable or Equatable, and why it's normal to arrive at them after writing repetitive code first. Swift macOS https://slekens.dev/en/blog/property-wrappers-in-swift/ https://slekens.dev/en/blog/property-wrappers-in-swift/ Fri, 15 May 2026 00:00:00 GMT What property wrappers are, how to build one from scratch, and when to use them — with practical examples: @Clamped, @Trimmed, and projectedValue. Swift macOS https://slekens.dev/en/blog/feature-flags-with-userdefaults/ https://slekens.dev/en/blog/feature-flags-with-userdefaults/ Thu, 14 May 2026 00:00:00 GMT How to use UserDefaults as a local feature flag system on macOS: a typed @propertyWrapper, clean reset, and an automatic active-flag log on launch. Swift macOS Xcode https://slekens.dev/en/blog/narcisse-launch/ https://slekens.dev/en/blog/narcisse-launch/ Mon, 04 May 2026 00:00:00 GMT Narcisse is now on the App Store. The app my wife and I built together to solve a real problem: generating a coordinated look based on your personal color season. apps iOS Narcisse https://slekens.dev/en/blog/algoviewer-launch/ https://slekens.dev/en/blog/algoviewer-launch/ Tue, 24 Feb 2026 00:00:00 GMT AlgoViewer is live on the App Store. An app to visualize algorithms and data structures step by step, with code examples in Swift, Python and Java. apps iOS AlgoViewer https://slekens.dev/en/blog/figuredex-amiibo-collection/ https://slekens.dev/en/blog/figuredex-amiibo-collection/ Fri, 02 Jan 2026 00:00:00 GMT FigureDex is on the App Store. A native catalog for Amiibo collectors with status tracking, series stats and iCloud sync. apps iOS FigureDex https://slekens.dev/en/blog/basic-operators/ https://slekens.dev/en/blog/basic-operators/ Thu, 01 Jan 2026 00:00:00 GMT Arithmetic, comparison, logical, ternary, range and the nil-coalescing operator in modern Swift. Second post in the Swift Basics series. Swift The Basics https://slekens.dev/en/blog/classes-and-structures/ https://slekens.dev/en/blog/classes-and-structures/ Thu, 01 Jan 2026 00:00:00 GMT Classes vs structs in modern Swift: value types vs reference types, properties, methods, initializers, inheritance and when to use each. Swift The Basics https://slekens.dev/en/blog/control-flow/ https://slekens.dev/en/blog/control-flow/ Thu, 01 Jan 2026 00:00:00 GMT Control flow in modern Swift: if/else, switch with pattern matching, for-in loops, while, and the guard statement that rewrites how you structure functions. Swift The Basics https://slekens.dev/en/blog/functions/ https://slekens.dev/en/blog/functions/ Thu, 01 Jan 2026 00:00:00 GMT Functions in modern Swift: parameter labels, default values, multiple return values with tuples, variadic parameters and closures. Swift The Basics https://slekens.dev/en/blog/optionals/ https://slekens.dev/en/blog/optionals/ Thu, 01 Jan 2026 00:00:00 GMT Optionals are Swift's most distinctive concept and why Swift apps tend to crash less. Learn if let, guard let, optional chaining and nil-coalescing. Swift The Basics https://slekens.dev/en/blog/swift-playgrounds-with-xcode/ https://slekens.dev/en/blog/swift-playgrounds-with-xcode/ Thu, 01 Jan 2026 00:00:00 GMT Swift Playgrounds let you write and run Swift code instantly, see results in real time, and experiment without creating a full project. Here's how to use them. Swift Tools https://slekens.dev/en/blog/variables-and-constants/ https://slekens.dev/en/blog/variables-and-constants/ Thu, 01 Jan 2026 00:00:00 GMT Variables, constants, type inference, tuples and collections in modern Swift. The first post in the Swift Basics series. Swift The Basics https://slekens.dev/en/blog/exposing-html-interface-in-macos/ https://slekens.dev/en/blog/exposing-html-interface-in-macos/ Fri, 04 Jul 2025 00:00:00 GMT FlyingFox + swift-html: how to embed an HTTP server in a macOS app to serve web interfaces from the Bundle, without heavy frameworks. Swift macOS FlyingFox