Axiom iOS Hang Diagnostics

About

Axiom iOS Hang Diagnostics provides a systematic framework for identifying, debugging, and fixing UI unresponsiveness in iOS, iPadOS, watchOS, and tvOS applications. It guides developers through the critical distinction between 'Main Thread Busy' and 'Main Thread Blocked' scenarios, offering structured workflows for using Instruments Time Profiler and System Trace. By implementing battle-tested code patterns for asynchronous I/O, actor-based synchronization, and optimized notifications, this skill helps developers eliminate app freezes and avoid system watchdog terminations.

Key Features

• Systematic diagnosis of main thread bottlenecks and UI freezes
• Implementation patterns for converting synchronous I/O to Swift Concurrency
• Strategies to prevent watchdog terminations during app launch and transitions
• Decision tree for selecting between Time Profiler and System Trace
• Guidance on interpreting Xcode Organizer and MetricKit hang reports
• 286 GitHub stars

Use Cases

• Resolving UI freezes caused by heavy image processing or file I/O on the main thread
• Debugging 'App Not Responding' reports found in the Xcode Organizer
• Optimizing app launch performance to prevent system-level process kills