Question

我的应用程序有一个功能可以将图像上传到Web服务器。虽然这在后台发生，但我设置了一个进度条，以便用户可以看到上传状态。我正在上传进度条，如下所示。只要没有其他HTTP请求，一切正常。一旦另一个请求被设置，setUploadProgressBlock就会停止更新，但最终会调用setCompletionBlockWithSuccess，所以我的进度条将在30到70之间的某个百分比，但上传实际上已经完成。对于其他请求，我没有使用AFNetworking。下面还有一个例子。我试过调用[operation waitUntillFinished]和我在网上看过的其他几个例子，但似乎没有任何工作。

图片上传=

NSData *postData= [[NSString stringWithFormat:@"description=%@&location=%@&image=%@",i, l, d] dataUsingEncoding:NSNonLossyASCIIStringEncoding allowLossyConversion:YES];

NSURL *url = [NSURL URLWithString: [NSString stringWithFormat:@"%@/upload/create", SERVICE_URL]];
AFHTTPClient *httpClient = [[AFHTTPClient alloc] initWithBaseURL:url];

NSMutableURLRequest *theRequest = [NSMutableURLRequest requestWithURL:url];
[theRequest setHTTPMethod:@"POST"];
[theRequest setHTTPBody:postData];

AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:theRequest];
[operation setUploadProgressBlock:^(NSUInteger bytesWritten, long long totalBytesWritten, long long totalBytesExpectedToWrite) {
    NSLog(@"Sent %lld of %lld bytes", totalBytesWritten, totalBytesExpectedToWrite);

        float percentDone = ((float)(totalBytesWritten) / (float)(totalBytesExpectedToWrite));

        [progressLabel setText:[NSString stringWithFormat:@"%.0f%%", (percentDone * 100)]];
        [progressView setProgress:percentDone];

}];

[operation  setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {

    NSLog(@"success: %@", operation.responseString);

}
  failure:^(AFHTTPRequestOperation *operation, NSError *error) {
      NSLog(@"error: %@",  operation.responseString);

  }
 ];
[httpClient enqueueHTTPRequestOperation:operation];

所有其他请求=

NSURL *loginURL = [NSURL URLWithString: [NSString stringWithFormat:@"%@/user/add", SERVICE_URL]];

        NSData *postData= [[NSString stringWithFormat:@"user_id=%@", user_id] dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];

        NSMutableURLRequest *theRequest = [NSMutableURLRequest requestWithURL:loginURL];
        [theRequest setHTTPMethod:@"POST"];
        [theRequest setHTTPBody:postData];

        NSOperationQueue *queue = [[NSOperationQueue alloc] init];
        [NSURLConnection sendAsynchronousRequest:theRequest queue:queue completionHandler:^(NSURLResponse *response, NSData *data, NSError *error)
         {


         }];

更新

为了解释一下，这里有一个控制台在这个过程中会是什么样子的例子 -

发送437568个769069字节

发送了另一个API调用

进度条停止更新

另一个API调用响应

成功：图片上传回复

Answer 1

您的无主HTTP客户端实例可能在操作完成之前被释放。使用示例中显示的静态单例模式，或将其存储在某个拥有的视图控制器的strong属性中。

Answer 2

setText:和setProgress是从错误的线程调用的，未获得更新是这里可能发生的危害最小的事情。

使用

dispatch_async(dispatch_get_main_queue(), ^ {
    [progressLabel setText:[NSString stringWithFormat:@"%.0f%%", (percentDone * 100)]];
    [progressView setProgress:percentDone];
});

或

[progressLabel performSelectorOnMainThread:@selector(setText:) withObject:[NSString stringWithFormat:@"%.0f%%", (percentDone * 100)] waitUntilDone:NO];
[progressView performSelectorOnMainThread:@selector(setProgress:) withObject:(id)percentDone waitUntilDone:NO];

Answer 3

切换到ASIHTTPRequest（http://allseeing-i.com/ASIHTTPRequest/）以检索上传进度并解决问题！

AFNetworking setUploadProgressBlock停止更新

3 个答案: