Swift 3 中的 NSManagedObject 子类化是不必要的吗？
Is it unnecessary to subclass NSManagedObject in Swift 3?
我之前知道您必须 "Editor" > "Create NSManagedObject Subclass" 才能在 类 中引用核心数据的实体名称。但是，在创建这些自动 sub类 后，我遇到了几个错误。
我的项目在没有这些子类文件的情况下运行良好，Swift 3 不再需要子类来引用实体了吗？
在 Swift 3 中，您不需要为 NSManagedObject 手动创建子类。
默认情况下，它们是自动创建的。但是，如果您想手动创建文件，请在 testCD.xcdatamodeld.
的实用程序区域中将 Codegen 设置为 Manual/None
来自 Apple 的 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.
我之前知道您必须 "Editor" > "Create NSManagedObject Subclass" 才能在 类 中引用核心数据的实体名称。但是，在创建这些自动 sub类 后，我遇到了几个错误。
我的项目在没有这些子类文件的情况下运行良好，Swift 3 不再需要子类来引用实体了吗？
在 Swift 3 中，您不需要为 NSManagedObject 手动创建子类。
默认情况下，它们是自动创建的。但是，如果您想手动创建文件，请在 testCD.xcdatamodeld.
Codegen 设置为 Manual/None
来自 Apple 的 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.