NSHTTPURLResponse+HTTPStatus.swift

extension NSHTTPURLResponse {
    
    public enum HTTPStatus {
        
        case info
        case success
        case redirect
        case clientError
        case serverError
        
        public init?(_ rawValue: Int?) {
            guard let statusCode = rawValue else { return nil }
            switch statusCode {
            case 100...199: self = .info
            case 200...299: self = .success
            case 300...399: self = .redirect
            case 400...499: self = .clientError
            case 500...599: self = .serverError
            default: return nil
            }
        }
    }
}

extension NSURLResponse {
    
    public var httpStatus: NSHTTPURLResponse.HTTPStatus? {
        return NSHTTPURLResponse.HTTPStatus((self as? NSHTTPURLResponse)?.statusCode)
    }
}