CODEWITHSUNDEEP
swiftenums
Chris
Chris

Reputation: 8091

how to determine the Enum type

I have a struct (is a SwiftUI - View in this case, but the question has nothing to do with SwiftUI because it could be any Struct) with a generic which should be an Enum - type. Can i ask somehow the generic, what type the enum is?

example:

enum TestA : String {
    case a = "a"
    case b = "b"
}

var id : TestA

so i would like to have something like

if id.isKind(of:String)

as it works for classes.

import SwiftUI

struct Whatever<EnumType>: View {

    let id: EnumType


    func askForType() {

        if id.isKind(of:String) {  <<<  this is not working, i know, but is there a workaround?
            print("is string")
        }
    }

    var body: some View {

        Text("aha")
    }
}

Upvotes: 0

Views: 115

Answers (1)

Harry J
Harry J

Reputation: 1956

I found a good work around but might need some more logic.

In SwiftUI,

enum TestA : Int {
    case a = 1
    case b = 2
}

struct ContentView: View {

    let id = TestA.self

    func askForType() -> String{
        return String(describing: type(of: id.RawValue))

    }

    var body: some View {
        Text(askForType())
            .frame(maxWidth: .infinity, maxHeight: .infinity)
    }
}

enter image description here

What this does is print the demangled type of the enum. In the example, this prints Int.rawvalue. Removing .rawValue from the type will only print the Enum identifier rather than type.

Upvotes: 2

Related Questions