moya_error_to_ns_error.swift

import Moya
import Foundation

guard let case MoyaError.underlying(nsError as NSError, _) = error else { return }

let unknownHostError = [
    NSURLErrorUnknown, 
    NSURLErrorCannotFindHost, 
    NSURLErrorDomain, 
    NSURLErrorCancelled, 
    NSURLErrorNetworkConnectionLost, 
    NSURLErrorNotConnectedToInternet, 
    NSURLErrorDNSLookupFailed, 
    NSURLErrorBackgroundSessionWasDisconnected, 
    NSURLErrorCancelledReasonBackgroundUpdatesDisabled, 
    NSURLErrorBackgroundSessionInUseByAnotherProcess
  ]

if unknownHostError.contains(nsError.code) {
  print("unknown host error")
} else if nsError.code == NSURLErrorTimedOut {
  print("timed out")
} else {
  print("unhandled error")
}