如何使用afnetworking在后台上传任务

Question

我正在尝试使用AFNetworking上传大文件,并在应用程序处于后台时继续上传.

我可以正常上传文件,但是当我尝试使用后台配置时 - 应用程序崩溃时出现以下堆栈跟踪:异常:EXC_BAD_ACCESS(代码= 1,地址= 0x8000001f))

_CFStreamSetDispatchQueue
-[__NSCFBackgroundDataTask captureStream:]
__70-[__NSCFBackgroundDataTask _onqueue_needNewBodyStream:withCompletion:]_block_invoke_2
_dispatch_call_block_and_release
_dispatch_queue_drain
_dispatch_queue_invoke
_dispatch_root_queue_drain
_dispatch_worker_thread3
_pthread_wqthread

这是一些示例代码:

注意:当我使用[NSURLSessionConfiguration defaultSessionConfiguration]上传成功但在应用程序在后台时不会继续.[NSURLSessionConfiguration backgroundSessionConfigurationWithIdentifier:@"com.company.appname.uploadservice"]导致应用程序崩溃.

NSMutableURLRequest *request = [[AFHTTPRequestSerializer serializer] multipartFormRequestWithMethod:@"POST" URLString:[uploadBundle.uploadUrl absoluteString] parameters:[uploadBundle getParameters] constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
    [formData appendPartWithFileURL:uploadBundle.fileDataUrl name:uploadBundle.fileName fileName:uploadBundle.fileName mimeType:uploadBundle.mimeType error:nil];
} error:nil];

Authentication *authentication = [Authentication getInstance];
[request addValue:authentication.token forHTTPHeaderField:@"token"];
[request addValue:authentication.authorization forHTTPHeaderField:@"Authorization"];

//NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration backgroundSessionConfigurationWithIdentifier:@"com.company.appname.uploadservice"];
AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:configuration];

NSProgress *progress = nil;
_currentUploadTask = [manager uploadTaskWithStreamedRequest:request progress:&progress completionHandler:^(NSURLResponse *response, id responseObject, NSError *error) {
    if (error) {
        NSLog(@"Error: %@", error);
    } else {
        NSLog(@"%@ %@", response, responseObject);
    }
}];

Answer 1

我正在回答我自己的问题,希望能帮助一些人.

我无法在任何地方找到此文档,但看起来您uploadTaskWithRequest:fromFile:progress:completionHandler:在使用后台会话配置时必须使用它.

这是一个简单的例子:

AppDelegate *appDelegate = (AppDelegate *) [[UIApplication sharedApplication] delegate];

id config = [NSURLSessionConfiguration backgroundSessionConfigurationWithIdentifier:@"com.opentext.core.uploadservice"];
id session = [NSURLSession sessionWithConfiguration:config delegate:appDelegate delegateQueue:[NSOperationQueue new]];

OMGMultipartFormData *multipartFormData = [OMGMultipartFormData new];
//[multipartFormData addFile:data parameterName:@"file" filename:nil contentType:nil];
[multipartFormData addParameters:[uploadBundle getParameters]];

NSURLRequest *rq = [OMGHTTPURLRQ POST:[uploadBundle.uploadUrl absoluteString] :multipartFormData];

id path = [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:@"upload.NSData"];
[rq.HTTPBody writeToFile:path atomically:YES];

[[session uploadTaskWithRequest:rq fromFile:[NSURL fileURLWithPath:path]] resume];