哈希表中的弱引用。-ARCweakreferencesinhashtable

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This question was posted several months ago, but for the record, NSHashTable does remove released weak references. So to answer the actual question, no, you don't need to iterate over the hash table periodically.

这个问题是几个月前发布的，但是对于这个记录，NSHashTable确实删除了弱引用。要回答实际的问题，不，你不需要周期性地遍历哈希表。

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I would make a manager class which is responsible for adding and removing objects you are speaking of. Thus I would notify the hash table in one of several ways:

我将创建一个manager类，它负责添加和删除您所说的对象。因此，我将以以下几种方式之一通知哈希表:

• directly via method invocation (when hash table is referenced by manager)
• 直接通过方法调用(当管理器引用哈希表时)
• indirectly making hash table a manager's delegate object
• 间接地使哈希表成为管理器的委托对象
• indirectly registering hashtable to observe any add/remove operations in manager
• 间接注册hashtable以观察manager中的任何添加/删除操作
• indirectly by making manager sending a notification to notification center, which notification is listened by the hash table
• 通过使manager向通知中心发送通知，该通知由散列表侦听

It all depends how did you bind together those objects and which models suits the most actual design.

这完全取决于如何将这些对象绑定在一起，以及哪种模型适合最实际的设计。