Which Swift types can be represented in Objective-C?
You cannot assign arbitrary types to Core Data properties because the accessor methods are created dynamically at runtime. If you create an Objective-Cmanaged object subclass in Xcode then you will see the proper data types usedby Core Data, e.g.
NSNumberfor Boolean, Integer, Float and Double attributes,NSStringfor String attributes,NSSetfor (unordered) to-many relationships.
You have to choose the same data type in Swift.
Theoretically, scalar accessors for primitive data types should work as well,but there seems to be a problem in the current Swift version, compareHow to use Core Data Integer 64 with Swift Int64? or EXC_BAD_ACCESS error when trying to change Bool property.