子类NSManagedObject在NSLog时不调用描述

问题描述

每个实体都有一个从NSManagedObject子类化的类。

我得到一个实体的关系集，并且遍历它将每个集合成员转换到特定的子类，因为我枚举了集合。

当我做

  NSLog（@My Entity：％ @，myEntityInstance）; 
 

它记录但不调用我的子类的方法：

   - （NSString *）description 
  

如果我发送：

  NSLog（@My Entity：％@，[myEntityInstance description]）; 
  

任何想法被称为什么，为什么描述必须手动调用？

谢谢！

解决方案

我从来没有见过。我不认为这是一个NSManagedObject行为。您可以在调用之前记录类，以确保您的实例是您认为的类。

I have a data model which has two entities in a relationship of one to many.

Each entity has a class that is subclassed from NSManagedObject.

I get the relation set for the one entity and walk it casting each set member to the specific subclass as I enumerate the collection.

When I do

NSLog(@"My Entity: %@", myEntityInstance);

It logs but does not call my subclass's method for:

- (NSString*) description

It does call if I send:

NSLog(@"My Entity: %@", [myEntityInstance description]);

Any ideas what is being called and why description has to be manually called?

Thanks!

解决方案

I've never seen that. I don't think it's a NSManagedObject behavior. You might log the class before making the call to make sure your instance is of the class you think it is.

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