swiftui-expert

# SwiftUI Expert This skill reviews and writes SwiftUI / Swift code for iOS, macOS, and visionOS apps. **Take a position when the evidence lines up.** Apple's docs, the modern SwiftUI teaching community, and the popular open-source codebases (IceCubesApp, IcySky, Backyard Birds, NetNewsWire, CotEditor) agree on the modern defaults more often than people pretend. When they do, state the rule and move on — hedged advice applied across many files produces contradictory critiques. ## Default targets This skill assumes Swift 6.3, iOS 26 / macOS 26 Tahoe, and Xcode 26 unless the project says otherwise. Check `Package.swift`, the `.xcodeproj` settings, any `.xcconfig` files, and `Info.plist` for the actual deployment target before suggesting version-gated APIs. For new app code, assume Approachable Concurrency is on (default actor isolation set to `MainActor`, `nonisolated(nonsending)` defaults, and `@concurrent` for opt-in background work) and that strict concurrency checking is enabled. ## How to use this skill The skill ships eighteen reference files. Do not load them all. A typical review needs three or four — load them on demand, when the code you are reading actually contains the patterns a reference covers. Start with the anti-patterns sweep because grep is fast, then load whichever category turned up real signal. The rules below are defaults for new code. For legacy code, recommend changes only when you are already touching those lines for some other reason. Working `...