// 160 articles available
An app that ran fine for years suddenly hangs on the splash screen when you debug it on an iOS 27 device, with an OS_dispatch_mach_msg unrecognized selector in the console. Here is what causes it and the one-line fix.
Xcode 27 ships seven official agent skills that capture Apple's own guidance on SwiftUI, testing, and security. Here's how to export them and use the same skills from Claude Code, Codex, or Cursor.
Xcode 27 dropped support for deployment targets below iOS 15. If your build now fails with IPHONEOS_DEPLOYMENT_TARGET set to a lower value and a supported range of 15.0 to 27.0, here is why and how to fix it.
Xcode 27 brings monthly subscriptions with a 12-month commitment, a reworked offer code redemption API, Bundles and Suites, and a unified App Review submission flow. Here is what each one changes for your code.
Expose your app's features to Siri, Shortcuts, and Spotlight with App Intents, the Swift-native replacement for SiriKit in iOS 16 and later.
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.
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.
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.
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.
If your React Native build started failing after upgrading to Xcode 26.4 with a consteval error from the fmt library, here's a targeted Podfile fix that gets you back up and running.
URLProtocol is one of the oldest interception points in Foundation's networking stack. It lets you mock, log, or transform any URLSession request without touching the code that makes the request.
SE-0493 finally lets you write defer { await cleanup() } in async functions, without spawning a detached task or threading cleanup logic through every return path.
print is fine for scratch work, but production apps need categories, levels, and privacy redaction. Here is how the Logger API from the os module gives you all of that without much ceremony.
Swift 6.4's withTaskCancellationShield lets cleanup code run to completion even after a task has been cancelled, without spawning extra unstructured tasks.
Swift 6.2 changes how async functions pick a thread by default. The new @concurrent attribute lets you explicitly opt into background execution when you actually need it.
How to set up custom URL schemes and Universal Links in iOS, handle incoming URLs in SwiftUI, and route users to the right screen.
Build a @DefaultEmpty property wrapper that automatically defaults missing or null array fields to an empty array when decoding JSON in Swift.
A practical guide to scheduling and handling local notifications in iOS using UNUserNotificationCenter, from permission requests to actionable notification categories.
iOS 18 introduced public APIs for building custom container views that can decompose content into individual subviews. Learn how to use ForEach(subviews:), Group(subviews:), and ContainerValues.
Xcode can consume 50GB+ of disk space over time. Here's how to reclaim storage by clearing caches, old simulators, device support files, and other accumulated cruft.
Swift Testing replaces XCTest with a cleaner macro-based API. Learn how to write tests with @Test, #expect, parameterized inputs, and traits in Xcode 16+.
Swift macros generate code at compile time, reducing boilerplate and catching errors early. Learn how to use built-in macros and understand how custom macros work.
Create interactive buttons for the Control Center using ControlWidgetButton and App Intents in iOS 18.
A practical guide to Swift error handling covering throw/try/catch fundamentals, custom error types, Result, async error patterns, and typed throws introduced in Swift 6.
Add haptic feedback to your SwiftUI views using the sensoryFeedback modifier, with built-in support for success, error, impact, and selection feedback.
A practical guide to SwiftUI animations covering implicit and explicit animations, spring physics, PhaseAnimator for multi-step sequences, and KeyframeAnimator for timeline-based control.
Use ViewThatFits to automatically select the best layout variant based on available space, without writing manual size calculations.
Set up Claude Code to automatically keep your Mac awake during long tasks and let it sleep again when finished, using hooks and the caffeinate command.
Understand the key difference between a UIView's frame and bounds properties, and when to use each in your iOS apps.