AgentSkillsCN

Swift Memory Management

ARC、弱引用/无主引用以及捕获列表的规范

SKILL.md
--- frontmatter
name: Swift Memory Management
description: Standards for ARC, Weak/Unowned References, and Capture Lists
metadata:
  labels: [swift, memory, arc, weak, unowned]
  triggers:
    files: ['**/*.swift']
    keywords: ['weak', 'unowned', 'capture', 'deinit', 'retain']

Swift Memory Management

Priority: P0

Implementation Guidelines

ARC Fundamentals

  • •Default: Strong references. Swift automatically manages retain/release.
  • •Weak: Use weak for delegate patterns and parent-child relationships.
  • •Unowned: Use unowned only when reference guaranteed to outlive (rare).

Capture Lists

  • •Closures: Always use [weak self] or [unowned self] in escaping closures.
  • •Self in Structs: No capture list needed (self is copied by value).
  • •Multiple Captures: [weak self, weak delegate].

Retain Cycles

  • •Delegates: Always weak var delegate.
  • •Closures as Properties: Use weak or unowned in capture list.
  • •two-way References: One side must be weak.

Anti-Patterns

  • •Strong Delegates: **No strong var delegate**: Use weak.
  • •Missing Capture List: **No self in escaping closures**: Use [weak self].
  • •Unowned Misuse: **Avoid unowned**: Use weak unless certain.

References