objective-c - Objective-C 运行时是否会为用户释放保留的关联引用？

Question

当像这样的一些代码时:

objc_setAssociatedObject (
  obj,
  &key,
  val,
  OBJC_ASSOCIATION_RETAIN
);

我需要调用相关的吗

objc_setAssociatedObject (
  obj,
  &key,
  nil,
  OBJC_ASSOCIATION_RETAIN
);

释放保留值？ Objective-C 运行时是否自动释放 dealloc 或某处的关联引用？

Answer 1

关联对象将在父对象被释放时被释放。请参阅文档 here ，特别是这个例子:

At point 1, the string overview is still valid because the OBJC_ASSOCIATION_RETAIN policy specifies that the array retains the associated object. When the array is deallocated, however (at point 2), overview is released and so in this case also deallocated.