UIWebView加载时报错:H5中一个按钮点击跳转另一个网页（NSURLErrorCancelled = -999）
UIWebView加载时报错:H5中一个按钮点击跳转另一个网页（NSURLErrorCancelled = -999）
陈满iOS
发布于 2018-09-10 11:19:06
发布于 2018-09-10 11:19:06
问题情境：嵌入金融相关的H5时，可能会有这样的操作：从接口请求得到一个JSON字符串，取出其中html字符串，由UIWebView的loadHTMLString方法渲染该html字符串。当一个按钮点击跳转另一个网页时，会走网页加载错误的代理方法。这时候，需要区分这种错误。
- 问题代码
- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error
{
//把出错信息打出来
NSLog(@"webview didFailLoadWithError %@ , and err is %@",webView.debugDescription, error.debugDescription);
[Toast showBottomWithText:@"加载失败,请稍后再试"];
}- 问题分析
慢网时，页面内通过按钮等控件跳转可能会出现报错（即使视觉上网页跳转并加载成功）。这是由于当一个按钮点击跳转另一个网页时，会走网页加载错误的代理方法。而走代理方法的原因是因为上一个URL还没完全加载完全，就开始下一个URL的请求，就会走该代理方法。
- 断点分析error
Error Domain=NSURLErrorDomain Code=-999 “The operation couldn’t be completed.- 查看NSURLErrorDomain的枚举类型
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,
};- 解决方案
取出error，专门忽略该类型错误
- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error
{
// 如果是被取消，什么也不干
if([error code] == NSURLErrorCancelled) {
return;
}
//把出错信息打出来
NSLog(@"webview didFailLoadWithError %@ , and err is %@",webView.debugDescription, error.debugDescription);
[Toast showBottomWithText:@"加载失败,请稍后再试"];
}本文参与 腾讯云自媒体分享计划，分享自作者个人站点/博客。
原始发表：2018.03.19 ，如有侵权请联系 cloudcommunity@tencent.com 删除
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