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我最近在尝试ASINetworkQueue，在这个过程中我遇到了一个很奇怪的问题。

我尝试从大约 30 MB 大小的服务器下载一个 zip，当我使用简单的 ASIHttpRequest 下载文件时，文件仅在 2 分钟内下载完毕，但是当我尝试将该请求放入 ASINetworkQueue 时，下载时间出人意料地增加了 5 分钟，太奇怪了..如果有人能说有什么不正确的话，我会放代码片段。

[self setNetworkQueue:[ASINetworkQueue queue]];
[[self networkQueue] setDelegate:self];
[[self networkQueue] setShouldCancelAllRequestsOnFailure:NO];
[[self networkQueue] setMaxConcurrentOperationCount:1];
[[self networkQueue] setShowAccurateProgress:YES];

if (!progressBar)
{
    progressBar = [[UIProgressView alloc] init];
}
[[self networkQueue] setDownloadProgressDelegate:progressBar];
[[self networkQueue] setRequestDidFinishSelector:@selector(requestFinished:)];
[[self networkQueue] setRequestDidFailSelector:@selector(requestFailed:)];
[[self networkQueue] setQueueDidFinishSelector:@selector(queueFinished:)];

NSArray *arrFilenames = [[NSArray alloc] initWithObjects:@"Audio", nil];

for (NSString *strFilename in arrFilenames)
{

    NSString *strDestFolderName = @"Destination Path";


    BOOL fileExists = [[NSFileManager defaultManager] fileExistsAtPath:  [NSString stringWithFormat:@"%@.zip", strDestFolderName]];

    if(!fileExists)
    {
        NSURL *url = <File Url to be downloaded>;

        ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];

        // This file has part of the download in it already
        [request setTemporaryFileDownloadPath:[NSString stringWithFormat:@"%@.zip.download", strDestFolderName]];
        [request setAllowResumeForFileDownloads:YES];
        [request setDownloadDestinationPath:[NSString stringWithFormat:@"%@.zip", strDestFolderName]];

        [request setTimeOutSeconds:30];
        [request setShouldContinueWhenAppEntersBackground:YES];
        [request setNumberOfTimesToRetryOnTimeout:2];
        request.userInfo = [NSDictionary dictionaryWithObjectsAndKeys: strFilename, @"fileName", nil];

        [[self networkQueue] addOperation:request];


    }

}




[[self networkQueue] go];

通过使用上面的代码，下载 Audio.zip 大约需要 5 分钟。但是当我执行以下操作时，需要 2 分钟。

NSArray *arrFilenames = [[NSArray alloc] initWithObjects:@"Audio", nil];

for (NSString *strFilename in arrFilenames)
{

    NSString *strDestFolderName = @"Destination Path";


    BOOL fileExists = [[NSFileManager defaultManager] fileExistsAtPath:  [NSString stringWithFormat:@"%@.zip", strDestFolderName]];

    if(!fileExists)
    {
        NSURL *url = <File Url to be downloaded>;

        ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];

        // This file has part of the download in it already
        [request setTemporaryFileDownloadPath:[NSString stringWithFormat:@"%@.zip.download", strDestFolderName]];
        [request setAllowResumeForFileDownloads:YES];
        [request setDownloadDestinationPath:[NSString stringWithFormat:@"%@.zip", strDestFolderName]];

        [request setTimeOutSeconds:30];
        [request setShouldContinueWhenAppEntersBackground:YES];
        [request setNumberOfTimesToRetryOnTimeout:2];
        request.userInfo = [NSDictionary dictionaryWithObjectsAndKeys: strFilename, @"fileName", nil];

        [request setDidFinishSelector:@selector(requestFinished:)];
        [request setDidFailSelector:@selector(requestFailed:)];
        [request setDownloadProgressDelegate:progressBar];

        [request start];


    }

}

注意 - 我只测试一个文件，而不是多个文件，但我的目标是下载多个文件..

谢谢。

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