即使释放，引用也不返回 nil
我在这里遇到了一个真正困难的问题。
我的类是自行创建的（+ (void) start;-方法），该方法被发送给委托。 我需要通过委托选择器向委托发送一些消息。为了检查委托是否被释放，我尝试了 if (delegate == nil/NULL)，但即使它真的被释放了，它仍然说没有。
我该如何解决这个问题？ （委托被分配给一个id）
这就是我的应用程序的构建方式：
AppDelegate
> NavController
>> TableView
>>> Post
>>>> GetData
GetData 是自创建的类。 Post是GetData的委托，由TableView/NavController释放。释放Post后，也被设置为nil。
换句话说，GetData 不会释放它的委托！
I have run into a real hard one here.
My class is self-created (a + (void) start;-method) which is sent a delegate.
I need to send the delegate a few messages through delegate-selectors. To check if the delegate was released, I have tried if (delegate == nil/NULL), but even if it really is released, it still says it wasn't.
How do I go around to fix this? (delegate is assigned to an id)
This is how my app is built up:
AppDelegate
> NavController
>> TableView
>>> Post
>>>> GetData
GetData is the self-created class. Post is the delegate of GetData, and is released by TableView/NavController. After releasing Post, it is also set to nil.
In other words, GetData does not release it's delegate!
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释放指针的内容不会自动将指针设置为NULL。您需要明确地执行此操作，例如
Deallocating the content of a pointer does not set the pointer to NULL automatically. You need to do it explicitly, e.g.
您无法检查对象是否已释放。另一个对象可能会出现并占据相同的内存空间，从而与原始对象无法区分。
具有委托的类的用户负责在释放委托对象时将委托设置为
nil。它不能被物体本身检测到。You can't check if an object was released. Another object could've come along and occupied the same memory space, becoming indistinguishable with the original object.
The user of a class with a delegate is responsible for setting the delegate to
nilwhen the delegate object is released. It's not detectable by the object itself.