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 without spending a dime. In case you are studying this weblog submit in 2023, you must 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 at liberty 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 that you don’t have to jot 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 more you solely have to evolve your enum sorts to the EnumCollection protocol and you may benefit from the model new instances technique and allValues property which is able to 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.instances() {
    print(weekday.rawValue)
}

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

Word that the bottom sort of the enumeration must be Hashable, however that’s not a giant deal. Nonetheless this resolution looks like previous tense, similar to Swift 4, please contemplate upgrading your challenge to the newest model of Swift. 👋