Swift enum all values – The.Swift.Dev.

From Swift 4.2 you possibly can merely conform to the CaseIterable protocol, and also you’ll get the allCases static property totally free. If you’re studying this weblog submit in 2023, it is best to positively improve your Swift language model to the newest. 🎉

enum ABC: String, CaseIterable {
    case a, b, c
}


print(ABC.allCases.map { $0.rawValue })

If you’re concentrating on beneath Swift 4.2, be happy to make use of the next methodology.

The EnumCollection protocol strategy

First we have to outline a brand new EnumCollection protocol, after which we’ll make a protocol extension on it, so that you don’t have to write down an excessive amount of code in any respect.

public protocol EnumCollection: Hashable {
    static func instances() -> AnySequence
    static var allValues: [Self] { get }
}

public extension EnumCollection {

    public static func instances() -> AnySequence {
        return AnySequence { () -> AnyIterator in
            var uncooked = 0
            return AnyIterator {
                let present: Self = withUnsafePointer(to: &uncooked) { $0.withMemoryRebound(to: self, capability: 1) { $0.pointee } }
                guard present.hashValue == uncooked else {
                    return nil
                }
                uncooked += 1
                return present
            }
        }
    }

    public static var allValues: [Self] {
        return Array(self.instances())
    }
}

To any extent further you solely have to adapt your enum varieties to the EnumCollection protocol and you’ll benefit from the model new instances methodology and allValues property which can include all of the potential values for that given enumeration.

enum Weekdays: String, EnumCollection {
    case sunday, monday, tuesday, wednesday, thursday, friday, saturday
}

for weekday in Weekdays.instances() {
    print(weekday.rawValue)
}

print(Weekdays.allValues.map { $0.rawValue.capitalized })

Notice that the bottom kind of the enumeration must be Hashable, however that’s not a giant deal. Nonetheless this answer appears like previous tense, similar to Swift 4, please contemplate upgrading your venture to the newest model of Swift. 👋