我使用URLSession来"POST"；请求，但有时当在路上请求时，我会得到带有差异错误的错误代码，更多时候是："；超时"；这是我在控制台"中看到的错误消息的例子；错误域=NSURLError域代码=-1009"；Internet连接似乎处于脱机状态"quot；
但我无法在代码中捕捉到这个错误，我做错了什么？，我也得到了另一个代码错误，但它并没有改变情况。
错误消息：
2020-11-25 09:52:07.456207+0200 TestApp[40176:2305710] Connection 4: received failure notification
2020-11-25 09:52:07.456344+0200 TestApp[40176:2305710] Connection 4: failed to connect 1:50, reason -1
2020-11-25 09:52:07.456771+0200 TestApp[40176:2305710] Connection 4: encountered error(1:50)
2020-11-25 09:52:07.459696+0200 TestApp[40176:2305710] Task <888AA895-677A-403B-A436-599FF55DB3BB>.<1> HTTP load failed, 0/0 bytes (error code: -1009 [1:50])
2020-11-25 09:52:07.460557+0200 Venom[40176:2305710] Task <888AA895-677A-403B-A436-599FF55DB3BB>.<1> finished with error [-1009]
Error Domain=NSURLErrorDomain Code=-1009 "The Internet connection appears to be offline." UserInfo={_kCFStreamErrorCodeKey=50, NSUnderlyingError=0x600000116880
{Error Domain=kCFErrorDomainCFNetwork Code=-1009 "(null)" UserInfo={_kCFStreamErrorCodeKey=50, _kCFStreamErrorDomainKey=1}}, _NSURLErrorFailingURLSessionTaskErrorKey=LocalDataTask
<888AA895-677A-403B-A436-599FF55DB3BB>.<1>, _NSURLErrorRelatedURLSessionTaskErrorKey=(
"LocalDataTask <888AA895-677A-403B-A436-599FF55DB3BB>.<1>"
), NSLocalizedDescription=The Internet connection appears to be offline.,
NSErrorFailingURLStringKey=https://link_to_my_request, NSErrorFailingURLKey=https://link_to_my_request, _kCFStreamErrorDomainKey=1}
我的代码：
func addPlayer(playerCode: String, completion: @escaping (Error?) -> ()) {
guard let url = URL(string: "(url)") else { return }
var urlRequest = URLRequest(url: url)
urlRequest.httpMethod = "POST"
let playerCode = [playerCode]
let params = ["players": playerCode]
do {
let data = try JSONSerialization.data(withJSONObject: params, options: .init())
urlRequest.httpBody = data
urlRequest.setValue("application/json", forHTTPHeaderField: "content-type")
let sessionConfig = URLSessionConfiguration.default
sessionConfig.timeoutIntervalForRequest = 5.0
DispatchQueue.global(qos: .background).async {
URLSession(configuration: sessionConfig).dataTask(with: urlRequest) { (data, resp, err) in
guard let data = data else { return }
guard let resp = resp else { return }
print(data)
print(resp)
if (err as? URLError)?.code == .timedOut {
// Handle session timeout
// THIS PIACE OF CODE DOES NOT EXECUTED
print("Oops, what is going on")
}
guard let response = resp as? HTTPURLResponse, (200 ..< 530) ~= response.statusCode else {
print("Error: HTTP request failed")
return
}
if response.statusCode == 200 {
print("Status code is 200")
do {
let json = try JSONDecoder().decode(ListOfPlayers.self, from: data)
// I am do what I am want
} catch let jsonError {
print("Error json serialization (jsonError)")
}
completion(nil)
} else if response.statusCode == 422 {
print("Status code is 422")
completion(nil)
return
}
}.resume()
}
} catch {
}
}
打印所有可能的URLError代码的rawValues：
unknown: -1 cancelled: -999 badURL: -1000 timedOut: -1001 unsupportedURL: -1002 cannotFindHost: -1003 cannotConnectToHost: -1004 networkConnectionLost: -1005 dnsLookupFailed: -1006 httpTooManyRedirects: -1007 resourceUnavailable: -1008 notConnectedToInternet: -1009 redirectToNonExistentLocation: -1010 badServerResponse: -1011 userCancelledAuthentication: -1012 userAuthenticationRequired: -1013 zeroByteResource: -1014 cannotDecodeRawData: -1015 cannotDecodeContentData: -1016 cannotParseResponse: -1017 appTransportSecurityRequiresSecureConnection: -1022 fileDoesNotExist: -1100 fileIsDirectory: -1101 noPermissionsToReadFile: -1102 dataLengthExceedsMaximum: -1103 secureConnectionFailed: -1200 serverCertificateHasBadDate: -1201 serverCertificateUntrusted: -1202 serverCertificateHasUnknownRoot: -1203 serverCertificateNotYetValid: -1204 clientCertificateRejected: -1205 clientCertificateRequired: -1206 cannotLoadFromNetwork: -2000 cannotCreateFile: -3000 cannotOpenFile: -3001 cannotCloseFile: -3002 cannotWriteToFile: -3003 cannotRemoveFile: -3004 cannotMoveFile: -3005 downloadDecodingFailedMidStream: -3006 downloadDecodingFailedToComplete: -3007 internationalRoamingOff: -1018 callIsActive: -1019 dataNotAllowed: -1020 requestBodyStreamExhausted: -1021 backgroundSessionRequiresSharedContainer: -995 backgroundSessionInUseByAnotherProcess: -996 backgroundSessionWasDisconnected: -997
您可以看到您正在寻找notConnectedToInternet代码。(rawValue-1009的(
所以，你的代码可能看起来像这样：
switch (err as? URLError)?.code {
case .some(.timedOut):
// Handle session timeout
case .some(.notConnectedToInternet):
// Handle not connected to internet
default: break
}