What is the difference between important and opportunistic usage?

Important usage capacity is reserved for user-created or essential data, while opportunistic usage capacity is for non-essential items like thumbnails or pre-fetched content.

How do I check for available disk space in iOS 11 and later?

Use volumeAvailableCapacityForImportantUsageKey for essential data and volumeAvailableCapacityForOpportunisticUsageKey for optional content to ensure your app respects system resource thresholds.

How does iOS decide which files to purge first?

iOS uses a location-based priority system where files in the tmp/ directory are purged most aggressively, followed by Library/Caches/ during periods of high storage pressure.

Which files are automatically excluded from iCloud backups?

Files stored in the tmp/ and Library/Caches/ directories are automatically excluded. For re-downloadable content in other directories, you must manually set the isExcludedFromBackup resource value.

iOS Storage Management Reference

Name: iOS Storage Management Reference
Author: CharlesWiltgen

byCharlesWiltgen

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233

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Mobile Development

Provides comprehensive guidance and implementation patterns for iOS storage management, disk capacity APIs, and file purging strategies.

This skill serves as a technical reference for iOS and macOS developers to manage device storage effectively. It covers modern capacity APIs like volumeAvailableCapacityForImportantUsage, provides code patterns for excluding files from iCloud backups, and explains the nuances of iOS's automatic file purging system. By following these battle-tested patterns, developers can ensure their apps behave correctly under low-storage conditions and optimize the user experience across Apple platforms.

Key Features

01Strategies for handling storage pressure and proactive cache cleanup

02233 GitHub stars

03Swift implementation patterns for backup exclusion and metadata

04Comprehensive reference for modern capacity APIs (iOS 11.0+)

05Detailed breakdown of location-based purge priorities

06Reference table for all relevant URL resource value keys

Use Cases

01Determining if there is enough space to save user-generated content versus optional caches

02Implementing proactive background cleanup when device storage is running low

03Preventing large, re-downloadable files from bloating a user's iCloud backup

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add charleswiltgen/axiom axiom-storage-management-ref

For use in Claude.ai and ChatGPT

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