ios – 文件下载期间进度阻止中的负值

2023年6月5日 266次阅读

我想下载pdf文件.当我下载小pdf文件然后我得到加值但是当我下载大文件然后我使用afnetworking得到负值.

这是我的代码：

- (IBAction)download:(id)sender {


    NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@""]];
    AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
    NSString *pdfName = @"The_PDF_Name_I_Want.pdf";

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *path = [[paths objectAtIndex:0] stringByAppendingPathComponent:pdfName];
    operation.outputStream = [NSOutputStream outputStreamToFileAtPath:path append:NO];
    [operation setDownloadProgressBlock:^(NSUInteger bytesRead, long long totalBytesRead, long long totalBytesExpectedToRead) {

        NSLog(@"Download = %f", (float)totalBytesRead / totalBytesExpectedToRead);
                self.progressView3.progress = (float)totalBytesRead / totalBytesExpectedToRead;

    }];
    [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
        NSLog(@"Successfully downloaded file to %@", path);
    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        NSLog(@"Error: %@", error);
    }];

    [operation start];
}

看看我的输出

2016-04-06 15:04:53.842 pdf[8149:60b] Download = -811521.000000
2016-04-06 15:04:53.849 pdf[8149:60b] Download = -817179.000000
2016-04-06 15:04:53.860 pdf[8149:60b] Download = -819123.000000
2016-04-06 15:04:53.872 pdf[8149:60b] Download = -823469.000000
2016-04-06 15:04:53.879 pdf[8149:60b] Download = -826393.000000
2016-04-06 15:04:53.921 pdf[8149:60b] Download = -827820.000000
2016-04-06 15:04:53.932 pdf[8149:60b] Download = -830744.000000
2016-04-06 15:04:53.939 pdf[8149:60b] Download = -833662.000000

请解决我的问题……

最佳答案 你的问题是在服务器上传pdf文件的内容长度

    如果未提供Content-Length HTTP标头,则.totalBytesExpectedToRead为-1

由server.you应该将此标头添加到您的服务器,或通过显示UIActivityIndi​​cator而不是UIProgressView来处理-1.

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