Objective-C Block Retain Cycles

概要

This skill provides a systematic framework for identifying and fixing the primary cause of memory leaks in Objective-C: block retain cycles. It guides developers through mandatory diagnostic procedures using Xcode Instruments and the Memory Debugger to verify leaks before applying code changes. By offering detailed implementation patterns for standard weak-strong references, hidden captures within macros, and complex nested blocks, the skill ensures xOS applications maintain a stable memory baseline and avoid crashes caused by messaging deallocated instances.

主な機能

• 61 GitHub stars
• Detection of hidden self-references in macros like NSLog, NSAssert, and string formatting.
• Mandatory weak-strong pattern implementation for single and nested blocks.
• Pattern selection rules to ensure systematic and consistent memory management fixes.
• Step-by-step diagnostic workflows for Xcode Instruments and the Memory Debugger.
• Guard condition validation to prevent asynchronous crashes from deallocated objects.

ユースケース

• Auditing legacy Objective-C codebases for silent memory accumulation during routine app usage.
• Resolving 'message to deallocated instance' crashes occurring in network or animation callbacks.
• Debugging UIViewController instances that fail to deallocate after a screen is dismissed.