How I can get rawValue from enum, if element is Any?

Question

I have a variable of type Any?. I'm totally know what that variable is type of enum: String. How I can get rawValue something like:

var somevar: Any? = someValue
(somevar as ?????).rawValue

https://stackoverflow.com/questions/32952248/get-all-enum-values-as-an-array. See this post I hop helps to you — AtulParmar, Dec 05 '18 at 12:54
If you *totally* know that the variable is a `String` enum, why do you declare it as `Any`? You are fighting the strong type system. Be always as specific as possible not the contrary. — vadian, Dec 05 '18 at 14:00

score 1 · Answer 1 · edited Jun 20 '20 at 09:12

First of all sorry I misunderstood your question.

Yes it is possible and very EASY

it is beauty of swift

You have to add some extra step there

Step1 :

Add protocol

protocol TestMe {
    var rawValueDesc: String {get}
    
}

Step 2 :

In your enum implement it

 enum YourEnum:String,TestMe {
        case one = "test"
        case two = "test1"
        
        var rawValueDesc: String {
            return self.rawValue
        }
        
    }

Finally

    var testdd:Any = YourEnum.one
    if let finalValue =   testdd as? TestMe {
       print( finalValue.rawValueDesc)
    }

Hope it is helpful to you

score 0 · Accepted Answer · edited Mar 01 '20 at 16:01

0

Assuming you have this defined somewhere in your or in imported module:

enum First: String {
    case a, b
}

enum Second: String {
    case c, d
}

In you module your should do something like this:

protocol StringRawRepresentable {
    var rawValue: String { get }
}

extension First: StringRawRepresentable {}
extension Second: StringRawRepresentable {}

And here's your problem:

var somevar: Any? = someValue
let result = (somevar as? StringRawRepresentable)?.rawValue

If, for example, someValue == Second.c you gonna get "c" in result.

This approach will work, but you will have to extend all the possible types, otherwise as? casting will result in nil even if type has rawValue: String property.

edited Mar 01 '20 at 16:01

brainray

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answered Dec 05 '18 at 13:15

user28434'mstep

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Seems this is equivalent to [this answer](https://stackoverflow.com/a/43868223/6541007). – OOPer Dec 05 '18 at 13:29
@OOPer, protocol names do match, rest is just trivial usage of language features, less complex that in that linked answer. – user28434'mstep Dec 05 '18 at 13:32
You can have your own opinion. But I cannot find any significant difference than the linked answer or the answer of Prashant Tukadiya. And yours is two minutes later than Prashant Tukadiya's. – OOPer Dec 05 '18 at 13:36
1

@OOPer earlier* – Rakesha Shastri Dec 05 '18 at 13:40
@OOPer, so what's your point? That I've plagiarised answer? Time `X ago` works in reverse, bigger the X, earlier it was posted. – user28434'mstep Dec 05 '18 at 13:42

How I can get rawValue from enum, if element is Any?

2 Answers2