Swift get associated value in enums without switch

Question

I have enum:

enum RetailDemandReturnOperation {
    case salesReturn(value: MSRetailSalesReturnRealm)
    case demand(value: MSRetailDemandRealm)
}

MSRetailDemandRealm and MSRetailDemandRealm are both implement same protocol, that have variables title and stats. I want to extract this values, but i don't care of which object actually stored in. Consider following:

 switch data! {
        case .salesReturn(let object):
            titleString = object.title
            statistics = object.stats
        case .demand(let object):
            titleString = object.title
            statistics = object.stats
          break
        }

I have to go in each enum value to get property of protocol. Is any way i can do it shorter and cleaner? Get associated value, no matter what it is, as long as it conforms to my protocol, and get protocol values? Thanks.

Answer 1

You could add a property to your enum that returns the protocol. For example:

enum RetailDemandReturnOperation {
    case salesReturn(value: MSRetailSalesReturnRealm)
    case demand(value: MSRetailDemandRealm)

    var realm: MSRetailRealm {
        switch self {
        case .salesReturn(let realm):
            return realm
        case .demand(let realm):
            return realm
        }
    }
}

Then, when you want to access those properties on a specific value of the enum, just use:

let operation = RetailDemandReturnOperation.salesReturn(value: MSRetailSalesReturnRealm())
let title = operation.realm.title