CODEWITHSUNDEEP
swiftenumsinit
Tal Cohen
Tal Cohen

Reputation: 1457

Swift enum with a custom constructor

I have a simple enum of type string:

enum MyEnum: String {
    case hello = "hello"
    case world = "world"
}

And I want to write a case-insensitive constructor. I tried this (with or without extension):

init?(string: String) {
    return self.init(rawValue: string.lowercased())
}

but I get an error saying:

'nil' is the only value permitted in an initializer

Upvotes: 0

Views: 906

Answers (1)

Alexander
Alexander

Reputation: 63399

You don't need to return anything. You just call initializer:

enum MyEnum: String {
    case hello = "hello"
    case world = "world"

    init?(caseInsensitive string: String) {
        self.init(rawValue: string.lowercased())
    }
}

print(MyEnum(caseInsensitive: "HELLO") as Any) // => Optional(Untitled.MyEnum.hello)
print(MyEnum(caseInsensitive: "Goodbye") as Any) // => nil

Upvotes: 3

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