ios - '文件名用于区分同名的私有(private)声明'错误

Question

我在 Swift 中的 Xcode 8.1 中生成 NSManagedObject 时遇到此错误。

:0: error: filename "DemoOne+CoreDataClass.swift" used twice: '/Users/Swasidhant/Desktop/demo again/DemoOne+CoreDataClass.swift' and '/Users/Swasidhant/Library/Developer/Xcode/DerivedData/demo_again-hiinrbwwbmyfbrbctsfdzvudkkuy/Build/Intermediates/demo again.build/Debug-iphonesimulator/demo again.build/DerivedSources/CoreDataGenerated/Model/DemoOne+CoreDataClass.swift' :0: note: filenames are used to distinguish private declarations with the same name :0: error: filename "DemoOne+CoreDataProperties.swift" used twice: '/Users/Swasidhant/Desktop/demo again/DemoOne+CoreDataProperties.swift' and '/Users/Swasidhant/Library/Developer/Xcode/DerivedData/demo_again-hiinrbwwbmyfbrbctsfdzvudkkuy/Build/Intermediates/demo again.build/Debug-iphonesimulator/demo again.build/DerivedSources/CoreDataGenerated/Model/DemoOne+CoreDataProperties.swift' :0: note: filenames are used to distinguish private declarations with the same name Command /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swiftc failed with exit code 1

我搜索了这个并得到了答案，说该文件可能在项目中出现两次，但这不是我的情况。我遇到的另一个解决方案是从构建阶段删除文件并再次添加。那也没用。这是一些build设置配置错误吗？还是别的？

这是使用 Xcode 8.1 创建并显示此问题的演示项目的链接:- https://www.dropbox.com/s/xwyzhshktb2hqe7/demo2.zip?dl=0

Answer 1

出现此问题是因为 Xcode 自动子类生成 功能。

根据 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.

因此，为了解决您的问题，您需要将 Codegen 字段值设置为 Manual/None ，如下所示: