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Complete API reference for collecting field performance metrics and diagnostics using MetricKit.

Comprehensive guide to Core Spotlight framework and NSUserActivity for making app content discoverable in Spotlight search, enabling Siri predictions, and supporting Handoff. Core Spotlight directly indexes app content while NSUserActivity captures user engagement for prediction.

Purpose: Comprehensive reference for storage pressure, purging policies, disk space, and URL resource values Availability: iOS 5.0+ (basic), iOS 11.0+ (modern capacity APIs) Context: Answer to "Does iOS provide any way to mark files as 'purge as last resort'?"

System photo picker for UIKit apps. No permission required.

Network.framework is Apple's modern networking API that replaces Berkeley sockets, providing smart connection establishment, user-space networking, built-in TLS support, and seamless mobility. Introduced in iOS 12 (2018) with NWConnection and evolved in iOS 26 (2025) with NetworkConnection for structured concurrency.

AXe is a CLI tool for interacting with iOS Simulators using Apple's Accessibility APIs and HID functionality. Single binary, no daemon required.

Purpose: Comprehensive reference for file encryption and data protection APIs Availability: iOS 4.0+ (all protection levels), latest enhancements in iOS 26 Context: Built on iOS Data Protection architecture using hardware encryption

Comprehensive API reference for modern Core Location (iOS 17+).

Purpose: Comprehensive reference for file-based iCloud sync using ubiquitous containers Availability: iOS 5.0+ (basic), iOS 8.0+ (iCloud Drive), iOS 11.0+ (modern APIs) Context: File-based cloud storage, not database (use CloudKit for structured data)

Complete reference for TextKit 2 covering architecture, migration from TextKit 1, Writing Tools integration, and SwiftUI TextEditor with AttributedString through iOS 26.