Switch in Swift - Case label in a switch should have at least one executable statement

Question

I have an enum type that extends String in Swift.

When I try to use a switch I got an error:

Case label in a switch should have at least one executable statement

Here is my code:

enum UserInfosKey:String {
   case CameraMyPhotoStream = "CMPS"
    case CameraICloudActivated = "CICA"
    case CameraICloudShare = "CICS"
    case ProjectTodayExtension = "PTE"
    case ProjectShareExtension = "PSE"
    case NetworkConnection = "NC"
    case PhoneLanguage = "PL"
    case CameraPhotosCount = "CPC"
    case UserIdentifier = "UI"
    case VersionHistory = "VH"
    case Path = "Path"

}

class UserInfosController: NSObject {
    func update(key:UserInfosKey, value:String, context:UserDefaultsMainKeys) -> String {
        switch key {
        case .CameraICloudActivated:
        case .CameraICloudShare:
        case .CameraMyPhotoStream:
        case .CameraPhotosCount:
        case .NetworkConnection:
        case .PhoneLanguage:
        case .UserIdentifier:
            return value

        default:
            return ""
        }
    }
}

I'm pretty sure it's a simple mistake, anyone see it?

Answer 1

You can have many values for a case, all you have to do is to separate them by a comma.

I would also recommend returning an nil value than an empty string and make the function return value an String?, but that depends on how the function is going to be used.

func update(key:UserInfosKey, value:String, context:UserDefaultsMainKeys) -> String? {
    switch key {
    case .CameraICloudActivated, 
         .CameraICloudShare, 
         .CameraMyPhotoStream,
         .CameraPhotosCount, 
         .NetworkConnection, 
         .PhoneLanguage, 
         .UserIdentifier:
        return value  
    default:
        return nil
    }
}