BoxSize.swift

enum BoxSize {
    case small
    case medium
    case large
    
    func value() -> CGFloat {
        switch self {
        case .small: return 1.0
        case .medium: return 2.0
        case .large: return 3.0
        }
    }

    func numberValue() -> NSNumber {
        switch self {
        case .small: return NSNumber(integerLiteral: 1)
        case .medium: return NSNumber(integerLiteral: 2)
        case .large: return NSNumber(integerLiteral: 3)
        }
    }

    static func fromNSNumber(value:NSNumber) -> BoxSize{
        return BoxSize.from(value: value.intValue)
    }
    static func from(value:Int) -> BoxSize{
        switch value {
        case 0: return BoxSize.small
        case 1: return BoxSize.medium
        case 2: return BoxSize.large
        default:
            fatalError("Not a valid value for BoxSize \(value)")
        }
    }
    
}