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SwiftUI's navigation APIs provide data-driven, programmatic navigation that scales from simple stacks to complex multi-column layouts. Introduced in iOS 16 (2022) with NavigationStack and NavigationSplitView, evolved in iOS 18 (2024) with Tab/Sidebar unification, and refined in iOS 26 (2025) with Liquid Glass design.

Core Principle: Optimize Swift code by understanding language-level performance characteristics—value semantics, ARC behavior, generic specialization, and memory layout—to write fast, efficient code without premature micro-optimization.

Swift Testing is Apple's modern testing framework introduced at WWDC 2024. It uses Swift macros (@Test, #expect) instead of naming conventions, runs tests in parallel by default, and integrates seamlessly with Swift concurrency.

The Human Interface Guidelines (HIG) define Apple's design philosophy and provide concrete guidance for creating intuitive, accessible, platform-appropriate experiences across all Apple devices.

You MUST use this skill for ANY iOS UI work including SwiftUI, UIKit, layout, navigation, animations, and design.

You MUST use this skill for ANY concurrency, async/await, threading, or Swift 6 concurrency work.

You MUST use this skill for ANY testing-related question, including writing tests, debugging test failures, making tests faster, or choosing between testing approaches.

Guides you through implementing camera capture: session setup, photo capture, video recording, responsive capture UX, rotation handling, and session lifecycle management.

Check build environment BEFORE debugging code. Core principle 80% of "mysterious" Xcode issues are environment problems (stale Derived Data, stuck simulators, zombie processes), not code bugs.

Use this skill when: