给AFNetworking添加请求缓存功能实现在没有网络的情况下返回缓存数据

- (instancetype)initWithSessionConfiguration:(NSURLSessionConfiguration *)configuration { ???self = [super init]; ???if (!self) { ???????return nil; ???} ???if (!configuration) { ???????configuration = [NSURLSessionConfiguration defaultSessionConfiguration]; ???} ???self.sessionConfiguration = configuration; ???#pragma mark 在这里给网络加上一个缓存 ???[self addURLCacheForRequestSession:configuration]; ???self.operationQueue = [[NSOperationQueue alloc] init]; ???self.operationQueue.maxConcurrentOperationCount = 1; ???????self.session = [NSURLSession sessionWithConfiguration:self.sessionConfiguration delegate:self delegateQueue:self.operationQueue]; ???self.responseSerializer = [AFJSONResponseSerializer serializer]; ???self.securityPolicy = [AFSecurityPolicy defaultPolicy];#if !TARGET_OS_WATCH ???self.reachabilityManager = [AFNetworkReachabilityManager sharedManager];#endif ???self.mutableTaskDelegatesKeyedByTaskIdentifier = [[NSMutableDictionary alloc] init]; ???self.lock = [[NSLock alloc] init]; ???self.lock.name = AFURLSessionManagerLockName; ???[self.session getTasksWithCompletionHandler:^(NSArray *dataTasks, NSArray *uploadTasks, NSArray *downloadTasks) { ???????for (NSURLSessionDataTask *task in dataTasks) { ???????????[self addDelegateForDataTask:task uploadProgress:nil downloadProgress:nil completionHandler:nil]; ???????} ???????for (NSURLSessionUploadTask *uploadTask in uploadTasks) { ???????????[self addDelegateForUploadTask:uploadTask progress:nil completionHandler:nil]; ???????} ???????for (NSURLSessionDownloadTask *downloadTask in downloadTasks) { ???????????[self addDelegateForDownloadTask:downloadTask progress:nil destination:nil completionHandler:nil]; ???????} ???}]; ???return self;}#pragma mark 添加缓存-(void)addURLCacheForRequestSession:(NSURLSessionConfiguration*)configuration{ ???if ([[[UIDevice currentDevice] systemVersion] compare:@"8.2" options:NSNumericSearch] == NSOrderedAscending) { ???????configuration.URLCache = [NSURLCache sharedURLCache]; ???} ???else { ???????configuration.URLCache = [[NSURLCache alloc] initWithMemoryCapacity:5 * 1024 * 1024 ??????????????????????????????????????????????????????????????diskCapacity:20 * 1024 * 1024 ??????????????????????????????????????????????????????????????????diskPath:@"customer_request_cache"]; ???}}

#pragma mark - NSURLSessionTaskDelegate- (void)URLSession:(__unused NSURLSession *)session ?????????????task:(NSURLSessionTask *)taskdidCompleteWithError:(NSError *)error{ ???__strong AFURLSessionManager *manager = self.manager; ???__block id responseObject = nil; ???__block NSMutableDictionary *userInfo = [NSMutableDictionary dictionary]; ???userInfo[AFNetworkingTaskDidCompleteResponseSerializerKey] = manager.responseSerializer; ???//Performance Improvement from #2672 ???NSData *data = nil; ???if (self.mutableData) { ???????data = [self.mutableData copy]; ???????//We no longer need the reference, so nil it out to gain back some memory. ???????self.mutableData = nil; ???} ???if (self.downloadFileURL) { ???????userInfo[AFNetworkingTaskDidCompleteAssetPathKey] = self.downloadFileURL; ???} else if (data) { ???????userInfo[AFNetworkingTaskDidCompleteResponseDataKey] = data; ???} ???if (error) {#pragma mark 网络错误时读取网络缓存数据 ???????if (error.code == -1009) { ???????????NSURLCache *cache = self.manager.session.configuration.URLCache; ???????????if (cache) { ???????????????NSCachedURLResponse *response = [cache cachedResponseForRequest:task.currentRequest]; ???????????????dispatch_async(url_session_manager_processing_queue(), ^{ ???????????????????NSError *serializationError = nil; ???????????????????responseObject = [manager.responseSerializer responseObjectForResponse:response.response data:response.data error:&serializationError]; ???????????????????????????????????????if (self.downloadFileURL) { ???????????????????????responseObject = self.downloadFileURL; ???????????????????} ???????????????????????????????????????if (responseObject) { ???????????????????????userInfo[AFNetworkingTaskDidCompleteSerializedResponseKey] = responseObject; ???????????????????} ???????????????????????????????????????if (serializationError) { ???????????????????????userInfo[AFNetworkingTaskDidCompleteErrorKey] = serializationError; ???????????????????} ???????????????????????????????????????dispatch_group_async(manager.completionGroup ?: url_session_manager_completion_group(), manager.completionQueue ?: dispatch_get_main_queue(), ^{ ???????????????????????if (self.completionHandler) { ???????????????????????????self.completionHandler(response.response, responseObject, serializationError); ???????????????????????} ???????????????????????dispatch_async(dispatch_get_main_queue(), ^{ ???????????????????????????[[NSNotificationCenter defaultCenter] postNotificationName:AFNetworkingTaskDidCompleteNotification object:task userInfo:userInfo]; ???????????????????????}); ???????????????????}); ???????????????}); ???????????} ???????} ???????else { ???????????userInfo[AFNetworkingTaskDidCompleteErrorKey] = error; ???????????????????????dispatch_group_async(manager.completionGroup ?: url_session_manager_completion_group(), manager.completionQueue ?: dispatch_get_main_queue(), ^{ ???????????????if (self.completionHandler) { ???????????????????self.completionHandler(task.response, responseObject, error); ???????????????} ???????????????????????????????dispatch_async(dispatch_get_main_queue(), ^{ ???????????????????[[NSNotificationCenter defaultCenter] postNotificationName:AFNetworkingTaskDidCompleteNotification object:task userInfo:userInfo]; ???????????????}); ???????????}); ???????} ???????????} else { ???????dispatch_async(url_session_manager_processing_queue(), ^{ ???????????NSError *serializationError = nil; ???????????responseObject = [manager.responseSerializer responseObjectForResponse:task.response data:data error:&serializationError]; ???????????if (self.downloadFileURL) { ???????????????responseObject = self.downloadFileURL; ???????????} ???????????if (responseObject) { ???????????????userInfo[AFNetworkingTaskDidCompleteSerializedResponseKey] = responseObject; ???????????} ???????????if (serializationError) { ???????????????userInfo[AFNetworkingTaskDidCompleteErrorKey] = serializationError; ???????????} ???????????dispatch_group_async(manager.completionGroup ?: url_session_manager_completion_group(), manager.completionQueue ?: dispatch_get_main_queue(), ^{ ???????????????if (self.completionHandler) { ???????????????????self.completionHandler(task.response, responseObject, serializationError); ???????????????} ???????????????dispatch_async(dispatch_get_main_queue(), ^{ ???????????????????[[NSNotificationCenter defaultCenter] postNotificationName:AFNetworkingTaskDidCompleteNotification object:task userInfo:userInfo]; ???????????????}); ???????????}); ???????}); ???}}

//网络请求错误代码enum { ???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, ???NSURLErrorInternationalRoamingOff = -1018, ???NSURLErrorCallIsActive = -1019, ???NSURLErrorDataNotAllowed = -1020, ???NSURLErrorRequestBodyStreamExhausted = -1021, ???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}