如何编写协议扩展以从Swift枚举中获取所有rawValues

enum TESTTYPE: String,EnumIteratable {
    case unitTest = "Unit Test"
    case uiTest = "UI Test"
}

class EnumIterator: NSObject {
    class func iterateEnum<T: Hashable>(_: T.TypE) -> AnyGenerator<T>  {
        var i = 0
        return anyGenerator {
            let next = withUnsafePointer(&i) { UnsafePointer<T>($0).memory }
            return next.hashValue == i++ ? next : nil
        }
    }

   class func getValues<T: Hashable>(_: T.TypE) -> [T] {
        let iterator = self.iterateEnum(T)
        var returnArray = [T]()
        for val in iterator {
            returnArray.append(val)
        }
        return returnArray
    }

}

我@R_696_10850@协议EnumIteratable,以便我可以调用TESTTYPE.getRawValues()并让它返回所有原始枚举值的字符串数组？

谢谢！