Generic enum type in objective-c

Question

I have two objective-c classes HondaDealerShip and FordDealerShip . They both contain similar properties and methods, so I want to define a common protocol DealerShip and do some polymorphism.

The problem is this DealerShip needs to contain generic enum type properties, so that HondaDealerShip and FordDealerShip can have different concrete enum types.

So I want something like this,

@protocol DealerShip 

@property (nonatomic, readonly) enum location;

-(void)printPriceOfModel:(enum)vehicleModel;

@end

typedef NS_ENUM(NSInteger, HondaLocation) {
     HondaLocationSouthEast,
     HondaLocationNorthWest
}

typedef NS_ENUM(NSInteger, HondaModel) {
     Accord,
     Civic
}

@interface HondaDealerShip: NSObject<DealerShip>

@property (nonatomic, readonly) HondaLocation location;

- (void)printPriceOfModel:(HondaModel)vehicleModel {
     //print price here
}

@end

typedef NS_ENUM(NSInteger, FordLocation) {
     FordLocationEast,
     FordLocationWest
}

typedef NS_ENUM(NSInteger, FordModel) {
     Mustang,
     Focus
}

@interface FordDealerShip: NSObject<DealerShip>

@property (nonatomic, readonly) FordLocation location;

- (void)printPriceOfModel:(FordModel)vehicleModel {
     //print price here
}

@end

If I have to do this in swift , I could use protocols with associated types like below

protocol DealerShip {
    associatedtype Location
    associatedtype Model

    var location: Location { get }
    func printPriceOfModel(model : Model)
}

enum HondaLocation: Int {
    case sountEast
    case northWest
}

enum HondaModel: Int {
    case accord
    case civic
}

struct HondaDealerShip: DealerShip {
    var location: HondaLocation
    func printPriceOfModel(model: HondaModel) {
        //print
    }
}

//same for FordDealerShip

can I do similar in objective-c?.

Answer 1

Nope, you cannot use enum with associated types in objective c. The language does not support it.