In Swift, is it possible to convert a string to an enum?

Question

If I have an enum with the cases a,b,c,d is it possible for me to cast the string \"a\" as the enum?

Answer 1

In Swift 4.2, the CaseIterable protocol can be used for an enum with rawValues, but the string should match against the enum case labels:

enum MyCode : String, CaseIterable {

    case one   = "uno"
    case two   = "dos"
    case three = "tres"

    static func withLabel(_ label: String) -> MyCode? {
        return self.allCases.first{ "\($0)" == label }
    }
}

usage:

print(MyCode.withLabel("one")) // Optional(MyCode.one)
print(MyCode(rawValue: "uno"))  // Optional(MyCode.one)