ios - 无法创建托管对象的子类

Question

来自 documentation (What's New In Core Data)

Xcode automatic subclass generation Xcode now supports automatic generation of NSManagedObject subclasses in the modeling tool. In the entity inspector: Manual/None is the default, and previous behavior; in this case you should implement your own subclass or use NSManagedObject. Category/Extension generates a class extension in a file named like ClassName+CoreDataGeneratedProperties. You need to declare/implement the main class (if in Obj-C, via a header the extension can import named ClassName.h). - Class Definition generates subclass files named like ClassName+CoreDataClass as well as the files generated for Category/Extension. The generated files are placed in DerivedData and rebuilt on the first build after the model is saved. They are also indexed by Xcode, so command-clicking on references and fast-opening by filename works.

无论我选择什么，它都不会生成。

我可能做错了什么或不完整，不是吗？

Answer 1

如果您将“Codegen”设置为“Class Definition”，就像在您的示例中一样，Xcode 会生成 NSManagedObject子类，但您实际上并没有在项目中看到。就像您发布的报价中所述，文件是在
~/Library/Developer/Xcode/DerivedData/...
您在项目中看不到它们，只有派生数据中的文件，您不必关心这些文件。 Xcode 确实有一个引用，所以命令+单击代码会按预期跳转到实现，而且您可以编写扩展等。

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