Want to enumerate an enum with String type in Swift programming language? Just mimic the Swift 4.2 implementation:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | #if !swift(>=4.2) public protocol CaseIterable { associatedtype AllCases: Collection where AllCases.Element == Self static var allCases: AllCases { get } } extension CaseIterable where Self: Hashable { static var allCases: [Self] { return [Self](AnySequence { () -> AnyIterator<Self> in var raw = 0 var first: Self? return AnyIterator { let current = withUnsafeBytes(of: &raw) { $0.load(as: Self.self) } if raw == 0 { first = current } else if current == first { return nil } raw += 1 return current } }) } } #endif |
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