Objective-C 运行时版本会为用户保留关联引用吗? [英] Will Objective-C runtime release retained associative references for user?

问题描述

当一些像这样的代码时:

When some codes like this:

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

我需要打电话给相关人员吗

Do I need to call related

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

释放保留值?Objective-C 运行时会自动释放 dealloc 或其他地方的关联引用吗?

to release the retained value? Does Objective-C runtime auto release the associative references in dealloc or somewhere?

推荐答案

当父对象被释放时，关联的对象将被释放.请参阅文档 这里，特别是这个例子:

Associated objects will be released when the parent object is deallocated. See the documentation here, specifically this example:

在第 1 点，字符串 overview 仍然有效，因为 OBJC_ASSOCIATION_RETAIN 策略指定数组保留关联对象.然而，当数组被释放时(在第 2 点)，overview 被释放，因此在这种情况下也被释放.

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.

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