Swift enum all values – The.Swift.Dev.

From Swift 4.2 you’ll be able to merely conform to the CaseIterable protocol, and you will get the allCases static property without cost. In case you are studying this weblog publish in 2023, it’s best to undoubtedly improve your Swift language model to the newest. 🎉

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


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

In case you are concentrating on under Swift 4.2, be happy to make use of the next technique.

The EnumCollection protocol method

First we have to outline a brand new EnumCollection protocol, after which we’ll make a protocol extension on it, so you do not have to put in writing an excessive amount of code in any respect.

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

public extension EnumCollection {

    public static func circumstances() -> AnySequence<Self> {
        return AnySequence { () -> AnyIterator<Self> 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.circumstances())
    }
}

Any more you solely have to adapt your enum sorts to the EnumCollection protocol and you’ll benefit from the model new circumstances technique and allValues property which can comprise all of the attainable values for that given enumeration.

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

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

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

Notice that the bottom kind of the enumeration must be Hashable, however that is not a giant deal. Nonetheless this answer looks like previous tense, identical to Swift 4, please contemplate upgrading your undertaking to the newest model of Swift. 👋