Implementing NSCopying in Swift with subclasses

Question

Consider two classes. The first is Vehicle, an NSObject subclass that conforms to NSCopying:

class Vehicle : NSObject,         


        

Answer 1

You need a required initializer because subclass implementation of a required initializer in Swift needs it.

Per Swift Documentation on Required nitializers:

You must also write the required modifier before every subclass implementation of a required initializer, to indicate that the initializer requirement applies to further subclasses in the chain.