I have created a very simple app to download a text file from my web server. I have this working perfectly with NSURLConnection, but am trying to migrate over to NSURLSession instead.
The issue I am having is that none of the delegate methods are being called.
My server is password protected so I need to use the basic http authentication to access the file, but when the didReceiveChallenge method is never called.
The line of code [getFileTask resume] seems to have no effect on anything.
My setup is as follows:
@interface ViewController : UIViewController <NSURLSessionDelegate, NSURLSessionDownloadDelegate, NSURLSessionTaskDelegate> { NSURLSession *session; } The following method is called from viewDidLoad:
-(void)setUpTheNetworking { NSString *fileURL = @"www.mywebsite.com/utility/file.txt"; NSURLSessionConfiguration *sessionConfig = [NSURLSessionConfiguration defaultSessionConfiguration]; sessionConfig.allowsCellularAccess = YES; sessionConfig.timeoutIntervalForRequest = 10; sessionConfig.timeoutIntervalForResource = 10; sessionConfig.HTTPMaximumConnectionsPerHost = 1; session = [NSURLSession sessionWithConfiguration:sessionConfig delegate:self delegateQueue:nil]; NSURLSessionDownloadTask *getFileTask = [session downloadTaskWithURL:[NSURL URLWithString:fileURL]]; [getFileTask resume]; } The delegate methods I have implemented are:
-(void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didWriteData:(int64_t)bytesWritten totalBytesWritten:(int64_t)totalBytesWritten totalBytesExpectedToWrite:(int64_t)totalBytesExpectedToWrite { NSLog(@"Here we go"); } -(void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didResumeAtOffset:(int64_t)fileOffset expectedTotalBytes:(int64_t)expectedTotalBytes { NSLog(@"Here we go"); } -(void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didFinishDownloadingToURL:(NSURL *)location { NSLog(@"Here we go"); } - (void)URLSession:(NSURLSession *)session didReceiveChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition disposition, NSURLCredential *credential))completionHandler { if (challenge.previousFailureCount == 0) { NSURLCredentialPersistence persistence = NSURLCredentialPersistenceForSession; NSURLCredential *credential = [NSURLCredential credentialWithUser:user password:@password persistence:persistence]; completionHandler(NSURLSessionAuthChallengeUseCredential, credential); } else { // handle the fact that the previous attempt failed NSLog(@"%s: challenge.error = %@", __FUNCTION__, challenge.error); completionHandler(NSURLSessionAuthChallengeCancelAuthenticationChallenge, nil); } } - (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didReceiveChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition disposition, NSURLCredential *credential))completionHandler { { if (challenge.previousFailureCount == 0) { NSURLCredential *credential = [NSURLCredential credentialWithUser:user password:password persistence:NSURLCredentialPersistenceForSession]; completionHandler(NSURLSessionAuthChallengeUseCredential, credential); } else { NSLog(@"%s; challenge.error = %@", __FUNCTION__, challenge.error); completionHandler(NSURLSessionAuthChallengeCancelAuthenticationChallenge, nil); } } } Thanks!