Swift enum all values – The.Swift.Dev.

From Swift 4.2 you may merely conform to the CaseIterable protocol, and also you’ll get the allCases static property without spending a dime. In case you are studying this weblog publish in 2023, you need to undoubtedly 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 focusing 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())
    }
}

Any further you solely have to evolve 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 })

Be aware that the bottom sort of the enumeration must be Hashable, however that’s not an enormous deal. Nevertheless this resolution looks like previous tense, identical to Swift 4, please contemplate upgrading your mission to the most recent model of Swift. 👋