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Energy issues manifest as battery drain, hot devices, and poor App Store reviews. Core principle: Measure before optimizing. Use Power Profiler to identify the dominant subsystem (CPU/GPU/Network/Location/Display), then apply targeted fixes.

Use when:

Purpose: Navigation hub for ALL storage decisions — database vs files, local vs cloud, specific locations iOS Version: iOS 17+ (iOS 26+ for latest features) Context: Complete storage decision framework integrating SwiftData (WWDC 2023), CKSyncEngine (WWDC 2023), and file management best practices

"Widgets are not mini apps. They're glanceable views into your app's data, rendered at strategic moments and displayed by the system. Extensions run in sandboxed environments with limited memory and execution time."

Symptom-based troubleshooting for Core Location issues.

Background execution is a privilege, not a right. iOS actively limits background work to protect battery life and user experience. Core principle: Treat background tasks as discretionary jobs — you request a time window, the system decides when (or if) to run your code.

Direct SQLite access using GRDB.swift — a toolkit for SQLite databases with type-safe queries, migrations, and reactive observation.

Systematic workflow for investigating TestFlight crashes and reviewing beta feedback using Xcode Organizer. Core principle: Understand the crash before writing any fix — 15 minutes of triage prevents hours of debugging.

Comprehensive guide to app localization using String Catalogs. Apple Design Award Inclusivity winners always support multiple languages with excellent RTL (Right-to-Left) support.

Foundation Models issues manifest as context window exceeded errors, guardrail violations, slow generation, availability failures, and unexpected output. Core principle 80% of Foundation Models problems stem from misunderstanding model capabilities (3B parameter device-scale model, not world knowledge), context limits (4096 tokens), or availability requirements—not framework bugs.