How to create Enum for hardcoded string in swift?

Question

I have some hardcoded string, based on that i have created switch case. But instead of string in switch case i am trying to create Enum for same. but i am not sure how to do that. I dont want to use default case.

Do i need to access with raw value or any other better way to do ?

enum screens: String {
        case faq = "faq", contactus = "contactus", termncondi = "termncondi", dashoboard = "dashoboard"
    }

    func deepLink(text: String) -> String {
            switch text {
                case "faq":
                    return (FAQ.localized())
                case "contactus":
                    return (Contactus.localized())
                case "termncondi":
                    return (Term.localized())
                case "dashoboard":
                    return (Dashboard.localized())
                default:
                    return ""
            }
        }

text will be the one which i am using in switch case, for ex. "faq", "contactus"... — user7423463
– user7423463, Commented Jun 25, 2020 at 10:02
because..i dont want to use default case..and want to maintain string only at one place..so that i can use same functionality at multiple places — user7423463
– user7423463, Commented Jun 25, 2020 at 10:15
Of course but where does the string come from? Is it an input of a text field or a value of a JSON API or what? If the string is arbitrary there is no benefit to use an enum. — vadian
– vadian, Commented Jun 25, 2020 at 10:16

Eilon · Accepted Answer · 2020-06-25 10:08:10Z

2

You can simply define the enum and override the rawValue property like so:

enum Link {
    case faq
    case contact
    ...

    var rawValue: String {
        switch self {
            case .faq:
                return FAQ.localized()
            case .contact:
                return Contact.localized()
            default:
                return "Unknown case"
        }
    }
}

And get its rawValue.

let faqLink = Link.faq.rawValue

You can also perform a switch on an enum instance just like you do with a string.

edited Jun 25, 2020 at 10:08

answered Jun 25, 2020 at 9:54

Eilon

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7 Comments

user7423463 Over a year ago

Thanks for help..can you please suggest based on my updated question? I am confused in how to perform enum in switch case

Eilon Over a year ago

I'm not sure why you would want to do it that way, just use the regular enum with the rawValue, like shown in my answer.

user7423463 Over a year ago

I am new to it..can you help me in using it in switch case? i am passing string to function

David Pasztor Over a year ago

That won't even compile, because enum raw values need to be hardcoded constants. You'd need to manually define the rawValue property of the enum.

user7423463 Over a year ago

but here how it will know that faq has string "faq".. i am doing switch based on "faq" string

|

Preefix · Accepted Answer · 2020-06-25 10:22:04Z

0

In order to get hardcoded values do something like:

public extension String {
    static func getScreens(name: DeepLink) -> String {
        return name.rawValue
    }

  public enum DeepLink: String {
    case faq = "faq"
    case contactus = "contactus"
    
    // and so on
}
}

edited Jun 25, 2020 at 10:22

answered Jun 25, 2020 at 10:05

Preefix

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1 Comment

user7423463 Over a year ago

how to add this in switch case?

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