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    <p>My solution..</p> <pre><code>- (void) pause { if(self.queue &amp;&amp; self.queue.requestsCount&gt;0) { NSLog(@"%@", self.queue.operations); for (ASIHTTPRequest * req in self.queue.operations) { req.userInfo = [NSDictionary dictionaryWithObject:@"1" forKey:@"ignore"]; } [self.queue.operations makeObjectsPerformSelector:@selector(cancel)]; [self.queue setSuspended:YES]; for (ASIHTTPRequest * req in self.queue.operations) { ASIHTTPRequest * newReq = [[ASIHTTPRequest alloc] initWithURL:req.url]; [newReq setDownloadDestinationPath:req.downloadDestinationPath]; [newReq setTemporaryFileDownloadPath:req.temporaryFileDownloadPath]; // [newReq setAllowResumeForFileDownloads:YES]; [newReq setUserInfo:req.userInfo]; [self.queue addOperation:newReq]; } } } - (void) resume { if(self.queue &amp;&amp; self.queue.requestsCount&gt;0) { [self _setupQueue]; [self.queue go]; } } - (void) _setupQueue { [self.queue setShouldCancelAllRequestsOnFailure:NO]; [self.queue setRequestDidStartSelector:@selector(downloadDidStart:)]; [self.queue setRequestDidFinishSelector:@selector(downloadDidComplete:)]; [self.queue setRequestDidFailSelector:@selector(downloadDidFailed:)]; [self.queue setQueueDidFinishSelector:@selector(queueDidFinished:)]; [self.queue setDownloadProgressDelegate:self.downloadProgress]; [self.queue setDelegate:self]; self.queue.maxConcurrentOperationCount = 3; // self.queue.showAccurateProgress = YES; } </code></pre> <p>First, pause function cancel all running operations, and recreate new requests push them into queue. Then resume function unsuspends the queue. Be noticed, request should not set setAllowResumeForFileDownloads:YES, otherwise the totalBytesToDownload will calculate wrong..If allowResumeForFileDownloads=NO, its value will be same as the count of requests in queue.</p> <p>Here is my request fail handler, I add retry when file download fail. But I don't whant when I cancel a request, the retry mechanism will be invoked, so I set userInfo(ignore:true) to request object to prevent it happens.</p> <pre><code>- (void) downloadDidFailed:(ASIHTTPRequest *)req { NSLog(@"request failed"); NSLog(@"%d", self.queue.requestsCount); if(![self.queue showAccurateProgress]) { [self.queue setTotalBytesToDownload:[self.queue totalBytesToDownload]-1]; NSLog(@"totalBytesToDownload=%lld", self.queue.totalBytesToDownload); } NSDictionary * userInfo = req.userInfo; if([[userInfo valueForKey:@"ignore"] boolValue]) return; // ignore retry int retryTimes = [[req.userInfo objectForKey:@"retryTimes"] intValue]; if(retryTimes&lt;kMU_MaxRetry) { ++ retryTimes; NSLog(@"retry %d", retryTimes); ASIHTTPRequest * newReq = [ASIHTTPRequest requestWithURL:req.url]; [newReq setDownloadDestinationPath:req.downloadDestinationPath]; [newReq setTemporaryFileDownloadPath:req.temporaryFileDownloadPath]; newReq.userInfo = [NSDictionary dictionaryWithObject:[NSString stringWithFormat:@"%d", retryTimes] forKey:@"retryTimes"]; [self.queue addOperation:newReq]; NSLog(@"%d", self.queue.requestsCount); }else{ // reach max retry, fail it [self.failures addObject:req]; } } </code></pre> <p>I am not sure if there is a better solution, hope it can help you.</p>
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