我使用以下代码在网络活动中使用后台会话。然而,我遇到了下面的崩溃日志错误。
请提供解决此问题的指针。不支持在后台会话中使用完成处理程序块。 请改用委托。
NSURLSessionConfiguration* config = [NSURLSessionConfiguration backgroundSessionConfigurationWithIdentifier:identifier];
config.sessionSendsLaunchEvents = YES;
config.allowsCellularAccess = YES;
config.discretionary = YES;
NSURLSession* session = [NSURLSession sessionWithConfiguration:config delegate:self delegateQueue:nil];
NSURLSessionDownloadTask* downloadTask = [session downloadTaskWithRequest:request];
[downloadTask resume];
崩溃日志
0 CoreFoundation __exceptionPreprocess + 120
1 libobjc.A.dylib objc_exception_throw + 52
2 CFNetwork -[__NSURLBackgroundSession validateSerializabilityForRequest:completion:] + 196
3 CFNetwork -[__NSURLBackgroundSession _onqueue_downloadTaskForRequest:resumeData:completion:] + 48
4 CFNetwork __90-[__NSURLBackgroundSession downloadTaskForRequest:downloadFilePath:resumeData:completion:]_block_invoke + 32
5 CFNetwork __68-[__NSURLBackgroundSession performBlockOnQueueAndRethrowExceptions:]_block_invoke + 72
6 libdispatch.dylib _dispatch_client_callout + 12
7 libdispatch.dylib _dispatch_barrier_sync_f_invoke + 80
8 CFNetwork -[__NSURLBackgroundSession performBlockOnQueueAndRethrowExceptions:] + 148
9 CFNetwork -[__NSURLBackgroundSession downloadTaskForRequest:downloadFilePath:resumeData:completion:] + 188
! 10 -[CRNSURLSessionTaskProxy initDownloadTaskWithSession:request:completionHandler:dispatch:] + 152
11 -[CRNSURLSessionProxy downloadTaskWithRequest:completionHandler:] + 108
12 -[CRNSURLSessionProxy downloadTaskWithRequest:] + 20