iOS平台 加载webView出现 code ＝ -999 错误分析和解决办法

加载webView时在

didFailLoadWithError中出现code ＝ -999错误。

错误原因：一个页面没有被加载完成之前，收到下一个请求。

解决办法：在didFailLoadWithError方法中，做如下处理即可：

if ([error code] == NSURLErrorCancelled) {

       return;

    }

code枚举列表：

    NSURLErrorUnknown = -1,

    NSURLErrorCancelled = -999,

    NSURLErrorBadURL = -1000,

    NSURLErrorTimedOut = -1001,

    NSURLErrorUnsupportedURL = -1002,

    NSURLErrorCannotFindHost = -1003,

    NSURLErrorCannotConnectToHost = -1004,

    NSURLErrorDataLengthExceedsMaximum = -1103,

    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,

    NSURLErrorFileDoesNotExist = -1100,

    NSURLErrorFileIsDirectory = -1101,

    NSURLErrorNoPermissionsToReadFile = -1102,

    NSURLErrorSecureConnectionFailed = -1200,

    NSURLErrorServerCertificateHasBadDate = -1201,

    NSURLErrorServerCertificateUntrusted = -1202,

    NSURLErrorServerCertificateHasUnknownRoot = -1203,

    NSURLErrorServerCertificateNotYetValid = -1204,

    NSURLErrorClientCertificateRejected = -1205,

    NSURLErrorClientCertificateRequired = -1206,

    NSURLErrorCannotLoadFromNetwork = -2000,

    NSURLErrorCannotCreateFile = -3000,

    NSURLErrorCannotOpenFile = -3001,

    NSURLErrorCannotCloseFile = -3002,

    NSURLErrorCannotWriteToFile = -3003,

    NSURLErrorCannotRemoveFile = -3004,

    NSURLErrorCannotMoveFile = -3005,

    NSURLErrorDownloadDecodingFailedMidStream = -3006,

    NSURLErrorDownloadDecodingFailedToComplete = -3007

参考来源：http://blog.csdn.net/yesjava/article/details/8056681