Xcode 8 generates broken NSManagedObject subclasses for iOS 10

Question

I updated my iOS app project recently to iOS 10. Now I\'m trying to change the Core Data Model of my app but the new NSManagedObject subclasses which Xcode generates are bro

Answer 1

You can try these steps

1. Select the .xcdatamodeld file in Xocde Project Navigator
2. In the Data Modul Inspector, make sure Codegen : Manual/None
3. Then Edit -> Create NSManagedObject Subclass
4. Clean product and rebuild

Is that work? If not

Make sure you all class has not the same name with Entities. You can find these class in Build Phases -> Compile Sources. Rename the class or Entities if they duplicated

Or

You can run this command to in your project folder to get more error info

xcodebuild -verbose

I got this message when i have this problem

duplicate symbol _OBJC_CLASS_$_RandomList in:

xxxx/RandomList.o

xxxx/RandomList+CoreDataClass.o

RandomList.h and RandomList+CoreDataClass.h have a same symbol when compiling

I think that why Xcode did not warn you, but Compiler will throw error

Hope this will help you