Preventing Race Conditions in iOS: Serial Queues vs. Dispatch Barriers
Learn how to use Apple's Grand Central Dispatch (GCD) serial queues and dispatch barriers to prevent race conditions and optimize data access in iOS/macOS apps.
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appleRapid UI Iteration with SwiftUI Previews and State Mocking
Learn how to use Xcode Previews and the #Preview macro to isolate SwiftUI components, inject mock state, and simulate environment traits like Dark Mode for faster UI iteration.
xcodeStructured Concurrency in Swift: Stop Leaking Tasks and Data Races
Structured concurrency in Swift replaces nested callbacks with scope-bound tasks, actors, and MainActor isolation. Learn how TaskGroup provides safe fan-out/fan-in and where Swift 6 strict checking changes migration.
Solving Scheme Sprawl with Xcode Test Plans
Stop duplicating Xcode schemes for every environment. Learn how .xctestplan files let you manage test targets, parallel execution, and sanitizers in a single, maintainable configuration.
Extending Classes Without Subclassing: A Practical Look at Objective-C Categories
Objective-C categories let you add methods to classes you don't own — no subclassing required. Here's how to use them safely, including prefixes, the no-ivars limit, and associated objects.
SwiftUI Previews in Xcode: Faster UI Iteration Without Full App Launches
SwiftUI Previews can collapse the compile-run-wait loop for UI work—if you structure views for them. A worked example with dark mode and Dynamic Type variants, plus the limits to respect.
Why SwiftUI Previews Run in Their Own Little World (and How to Work With It)
SwiftUI previews fail in ways the simulator never does because they run a minimal, constrained build of your app. Here's why Apple made that trade-off and how to design views that preview well.
Choosing Between async/await and Combine for Network Layers in Swift
A technical decision guide for choosing between Swift's async/await and Combine for network calls, comparing syntax, OS requirements, and performance overhead.
swiftChoosing an Entitlement Strategy for Apple In-App Purchases
A guide for Apple developers choosing between StoreKit 2, App Store Server API, and Notifications V2 for managing IAP and subscription entitlements.