NSDictionary中的弱对象？ [英] Weak object in an NSDictionary?

问题描述

我想在 NSDictionary 中存储对象的归零弱引用。这是为了引用父 NSDictionary ，所以我可以在不搜索的情况下爬行大型结构。

I would like to store a zeroing weak reference to an object in a NSDictionary. This is for a reference to a parent NSDictionary, so I can crawl back up a large structure without searching.

我不能在这里使用 __ weak ;即使我的本地引用很弱， NSDictionary 也会存储对弱引用对象的强引用。当然， NSDictionary 不能有 nil 对象。

I can not use __weak here; even if my local reference is weak, the NSDictionary will store a strong reference to the object that was weakly referenced. And, of course, NSDictionary can't have nil objects.

我在iOS上，而不是Mac，所以 NSHashTable 不可用。我只希望一个物体变弱;其余部分应该仍然很强。

I'm on iOS, not Mac, so NSHashTable isn't available. And I only want one object to be weak; the rest should still be strong.

（我将发布我的答案，所以如果没有更好的答案，我有一些标记可以接受。但我是希望有人有更好的答案。）

(I'm going to post my answer, so I have something to mark as accepted if there's no better answer. But I'm hoping someone has a better answer.)

推荐答案

在iOS 6+中你可以使用 NSMapTable 并选择是否希望对象和/或键变弱或变强。

In iOS 6+ you can use NSMapTable and choose if you want objects and/or keys to be weak or strong.

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