Swift enum all values – The.Swift.Dev.

From Swift 4.2 you’ll be able to merely conform to the CaseIterable protocol, and also you’ll get the allCases static property totally free. In case you are studying this weblog put up in 2023, it’s best to positively improve your Swift language model to the most recent. 🎉

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


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

In case you are concentrating on beneath Swift 4.2, be at liberty to make use of the next technique.

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 circumstances() -> AnySequence
    static var allValues: [Self] { get }
}

public extension EnumCollection {

    public static func circumstances() -> 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.circumstances())
    }
}

Any longer you solely have to evolve your enum varieties to the EnumCollection protocol and you may benefit from the model new circumstances technique and allValues property which is able to include all of the doable 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 })

Observe that the bottom kind of the enumeration must be Hashable, however that’s not an enormous deal. Nevertheless this resolution seems like previous tense, identical to Swift 4, please take into account upgrading your challenge to the most recent model of Swift. 👋