Raw value for enum case must be a literal

Question

I have this enum:

enum GestureDirection:UInt {
    case Up =       1 << 0
    case Down =     1 << 1
    case Left =     1 << 2
    case Right          


        

Answer 1

You seems to want a bitwise support for your enums, but if you regards a translation of NS_OPTIONS Objective-C in Swift, that's not represented by a Swift Enum but a struct inherit from RawOptionSetType.

If you need example or instructions, you can look at this NSHipster article

That's could be done with something like this :

struct UIViewAutoresizing : RawOptionSetType {
    init(_ value: UInt)
    var value: UInt
    static var None: UIViewAutoresizing { get }
    static var FlexibleLeftMargin: UIViewAutoresizing { get }
    static var FlexibleWidth: UIViewAutoresizing { get }
    static var FlexibleRightMargin: UIViewAutoresizing { get }
    static var FlexibleTopMargin: UIViewAutoresizing { get }
    static var FlexibleHeight: UIViewAutoresizing { get }
    static var FlexibleBottomMargin: UIViewAutoresizing { get }
}

Regards,