Question

程序中最重要的功能是管理设备的脱机在线状态，并保存对脱机状态的请求/在联机时推送它们。因此，我得到了一些实验获得的错误代码，例如-1009，-1001，-1003，-1005，每个错误代码都对应于网络错误代码。现在，我只是检查获得的错误代码是否等于这些家伙之一，但是是否有更聪明的方法？也许是网络错误列表/特殊前缀/等。

那么，如何检查描述网络问题的错误？

Answer 1

如果有人想像我一样根据错误代码来调整代码，那么（在Foundation的NSURLError.h中找到），欢迎您：

NS_ERROR_ENUM(NSURLErrorDomain)
{
    NSURLErrorUnknown =             -1,
    NSURLErrorCancelled =           -999,
    NSURLErrorBadURL =              -1000,
    NSURLErrorTimedOut =            -1001,
    NSURLErrorUnsupportedURL =          -1002,
    NSURLErrorCannotFindHost =          -1003,
    NSURLErrorCannotConnectToHost =         -1004,
    NSURLErrorNetworkConnectionLost =       -1005,
    NSURLErrorDNSLookupFailed =         -1006,
    NSURLErrorHTTPTooManyRedirects =        -1007,
    NSURLErrorResourceUnavailable =         -1008,
    NSURLErrorNotConnectedToInternet =      -1009,
    NSURLErrorRedirectToNonExistentLocation =   -1010,
    NSURLErrorBadServerResponse =       -1011,
    NSURLErrorUserCancelledAuthentication =     -1012,
    NSURLErrorUserAuthenticationRequired =  -1013,
    NSURLErrorZeroByteResource =        -1014,
    NSURLErrorCannotDecodeRawData =             -1015,
    NSURLErrorCannotDecodeContentData =         -1016,
    NSURLErrorCannotParseResponse =             -1017,
    NSURLErrorAppTransportSecurityRequiresSecureConnection API_AVAILABLE(macos(10.11), ios(9.0), watchos(2.0), tvos(9.0)) = -1022,
    NSURLErrorFileDoesNotExist =        -1100,
    NSURLErrorFileIsDirectory =         -1101,
    NSURLErrorNoPermissionsToReadFile =     -1102,
    NSURLErrorDataLengthExceedsMaximum API_AVAILABLE(macos(10.5), ios(2.0), watchos(2.0), tvos(9.0)) =  -1103,
    NSURLErrorFileOutsideSafeArea API_AVAILABLE(macos(10.12.4), ios(10.3), watchos(3.2), tvos(10.2)) = -1104,

    // SSL errors
    NSURLErrorSecureConnectionFailed =      -1200,
    NSURLErrorServerCertificateHasBadDate =     -1201,
    NSURLErrorServerCertificateUntrusted =  -1202,
    NSURLErrorServerCertificateHasUnknownRoot = -1203,
    NSURLErrorServerCertificateNotYetValid =    -1204,
    NSURLErrorClientCertificateRejected =   -1205,
    NSURLErrorClientCertificateRequired =   -1206,
    NSURLErrorCannotLoadFromNetwork =       -2000,

    // Download and file I/O errors
    NSURLErrorCannotCreateFile =        -3000,
    NSURLErrorCannotOpenFile =          -3001,
    NSURLErrorCannotCloseFile =         -3002,
    NSURLErrorCannotWriteToFile =       -3003,
    NSURLErrorCannotRemoveFile =        -3004,
    NSURLErrorCannotMoveFile =          -3005,
    NSURLErrorDownloadDecodingFailedMidStream = -3006,
    NSURLErrorDownloadDecodingFailedToComplete =-3007,

    NSURLErrorInternationalRoamingOff API_AVAILABLE(macos(10.7), ios(3.0), watchos(2.0), tvos(9.0)) =         -1018,
    NSURLErrorCallIsActive API_AVAILABLE(macos(10.7), ios(3.0), watchos(2.0), tvos(9.0)) =                    -1019,
    NSURLErrorDataNotAllowed API_AVAILABLE(macos(10.7), ios(3.0), watchos(2.0), tvos(9.0)) =                  -1020,
    NSURLErrorRequestBodyStreamExhausted API_AVAILABLE(macos(10.7), ios(3.0), watchos(2.0), tvos(9.0)) =      -1021,

    NSURLErrorBackgroundSessionRequiresSharedContainer API_AVAILABLE(macos(10.10), ios(8.0), watchos(2.0), tvos(9.0)) = -995,
    NSURLErrorBackgroundSessionInUseByAnotherProcess API_AVAILABLE(macos(10.10), ios(8.0), watchos(2.0), tvos(9.0)) = -996,
    NSURLErrorBackgroundSessionWasDisconnected API_AVAILABLE(macos(10.10), ios(8.0), watchos(2.0), tvos(9.0))= -997,
};

检查错误（错误代码）是否属于网络错误

1 个答案: