How to set up custom URL schemes and Universal Links in iOS, handle incoming URLs in SwiftUI, and route users to the right screen.

Learn how to use Swift's RegexBuilder DSL to create readable, type-safe regular expressions with compile-time checking and strongly-typed captures.

Expose your app's features to Siri, Shortcuts, and Spotlight with App Intents, the Swift-native replacement for SiriKit in iOS 16 and later.

Learn how to create beautiful, interactive charts in SwiftUI using Apple's Swift Charts framework, from simple line charts to customized bar graphs.

OSAllocatedUnfairLock wraps os_unfair_lock with a closure-based API that makes it impossible to forget to unlock and keeps the lock's storage alive for as long as you need it.

Master Swift's TaskGroup for parallel async work with proper cancellation, error handling, and result collection. Learn common patterns for batch operations and concurrent pipelines.

Create interactive buttons for the Control Center using ControlWidgetButton and App Intents in iOS 18.

Use ViewThatFits to automatically select the best layout variant based on available space, without writing manual size calculations.

Learn how to use Swift's @observable macro introduced in iOS 17, understand its advantages over ObservableObject, and migrate your existing code to the modern observation system.

A practical guide to App Tracking Transparency in iOS, covering the Info.plist usage description, the ATTrackingManager API, authorization statuses, and when to actually prompt the user from SwiftUI.

Objective-C's lightweight generics let you specify element types for collections like NSArray<NSString *>. They catch type mismatches at compile time and improve Swift bridging.

Use the #Preview macro to preview your Live Activity views directly in Xcode without running the full app.

Objective-C supports exception handling with @try/@catch, but the community settled on NSError pointers instead. Here's why.

Continuations bridge completion-handler APIs into async/await. The checked variant catches the two ways you can get it wrong, and the unsafe one trusts you completely.

SE-0491 introduces the :: operator to disambiguate names that come from different modules. Here is when you actually need it and the gotchas worth knowing.

Compare @AppStorage, UserDefaults, and SwiftData for persisting data in Swift apps. Learn when each approach makes sense and how to use them effectively.

Understand the key difference between a UIView's frame and bounds properties, and when to use each in your iOS apps.

A practical guide to scheduling and handling local notifications in iOS using UNUserNotificationCenter, from permission requests to actionable notification categories.

Swift 6's data-race safety is real, but it has blind spots. Here are the places the compiler can't see, and how to stop treating a clean build as proof your code is thread safe.

NSError is the standard error handling mechanism in Objective-C, but using it defensively requires more than just passing a pointer. Learn patterns that prevent crashes and make debugging easier.