Progress bar ASIHTTPRequest的setDownloadProgressDelegate不工作

我想从服务器下载大尺寸的zip文件。为此，我正在使用ASIHTTPRequest。我已成功下载文件，但我想显示进度条。我已实现它，就像ASIHTTPRequest的示例一样，但我的进度条未显示进度。我的代码在下面

  [networkQueue reset];
  networkQueue setRequestDidFinishSelector:@selector(imageFetchComplete:)];
[networkQueue setRequestDidFailSelector:@selector(imageFetchFailed:)];
    [networkQueue setDelegate:self];
    request = [ASIHTTPRequest requestWithURL:[NSURL URLWithString:fullURL]];
    fullPathTemp = [NSString stringWithFormat:@"%@/temp.zip", self.documentsDir];
    [request setDownloadProgressDelegate:progressIndicator];
    [request setDownloadDestinationPath:fullPathTemp];
    [request setUserInfo:[NSDictionary dictionaryWithObject:@"request1" forKey:@"name"]];
    [request setShouldContinueWhenAppEntersBackground:YES];
    [networkQueue addOperation:request];
   [networkQueue go];

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高级感谢。

可能是您的progressIndicator未设置