AFNetworking 2.0 track file upload progress

问题:

I am relatively new to AFNetworking 2.0. Using the code snippet below, I've been able to successfully upload a photo to my url. I would like to track the incremental upload progress, but I cannot find an example of doing this with version 2.0. My application is iOS 7, so I've opted for AFHTTPSessionManager.

Can anyone offer an example of how to modify this snippet to track upload progress?

AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];

NSData *imageData = UIImageJPEGRepresentation([UIImage imageNamed:@"myimage.jpg"], 1.0);

[manager POST:@"http://myurl.com" parameters:dataToPost constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
    [formData appendPartWithFileData:imageData name:@"attachment" fileName:@"myimage.jpg" mimeType:@"image/jpeg"];
} success:^(NSURLSessionDataTask *task, id responseObject) {
    NSLog(@"Success %@", responseObject);
} failure:^(NSURLSessionDataTask *task, NSError *error) {
    NSLog(@"Failure %@, %@", error, [task.response description]);
}];

回答1:

The interface of AFHTTPSession doesn't provide a method to set a progress block. Instead, you'll have to do the following:

// 1. Create `AFHTTPRequestSerializer` which will create your request.
AFHTTPRequestSerializer *serializer = [AFHTTPRequestSerializer serializer];

// 2. Create an `NSMutableURLRequest`.
NSMutableURLRequest *request =
    [serializer multipartFormRequestWithMethod:@"POST" URLString:@"http://www.myurl.com"
                                    parameters:dataToPost
                     constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
                       [formData appendPartWithFileData:imageData
                                                   name:@"attachment"
                                               fileName:@"myimage.jpg"
                                               mimeType:@"image/jpeg"];
                     }];

// 3. Create and use `AFHTTPRequestOperationManager` to create an `AFHTTPRequestOperation` from the `NSMutableURLRequest` that we just created.
AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
AFHTTPRequestOperation *operation =
    [manager HTTPRequestOperationWithRequest:request
                                     success:^(AFHTTPRequestOperation *operation, id responseObject) {
                                       NSLog(@"Success %@", responseObject);
                                     } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
                                       NSLog(@"Failure %@", error.description);
                                     }];

// 4. Set the progress block of the operation.
[operation setUploadProgressBlock:^(NSUInteger __unused bytesWritten,
                                    long long totalBytesWritten,
                                    long long totalBytesExpectedToWrite) {
  NSLog(@"Wrote %lld/%lld", totalBytesWritten, totalBytesExpectedToWrite);
}];

// 5. Begin!
[operation start];

In addition, you don't have to read the image via UIImage and then compress it again using JPEG to get an NSData. Just use +[NSData dataWithContentsOfFile:] to read the file directly from your bundle.

回答2:

It's true the interface of AFHTTPSessionManager doesn't provide a method to track the upload progress. But the AFURLSessionManager does.

As a inherited class of AFURLSessionManager AFHTTPSessionManager can track upload progress like this:

NSMutableURLRequest *request = [[AFHTTPRequestSerializer serializer]  multipartFormRequestWithMethod:@"POST" URLString:kUploadImageURL parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
    [formData appendPartWithFileData:UIImageJPEGRepresentation(image, 0.5) name:@"uploadFile" fileName:@"image" mimeType:@"image/jpeg"];
} error:nil];

NSProgress *progress;
NSURLSessionDataTask *uploadTask = [[AFHTTPSessionManager sharedManager] uploadTaskWithStreamedRequest:request progress:&progress completionHandler:^(NSURLResponse *response, id responseObject, NSError *error) {
    if (!error) {
        //handle upload success
    } else {
        //handle upload failure
    }
}];
[uploadTask resume];
[progress addObserver:self forKeyPath:@"fractionCompleted" options:NSKeyValueObservingOptionNew context:NULL];

outside

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
    if ([keyPath isEqualToString:@"fractionCompleted"] && [object isKindOfClass:[NSProgress class]]) {
        NSProgress *progress = (NSProgress *)object;
        //progress.fractionCompleted tells you the percent in CGFloat
    }
}

Here is method 2(updated)

use KVO to track progress means self need to be alive during observation. The more elegant way is AFURLSessionManager's method setTaskDidSendBodyDataBlock, like this:

AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
[manager setTaskDidSendBodyDataBlock:^(NSURLSession *session, NSURLSessionTask *task, int64_t bytesSent, int64_t totalBytesSent, int64_t totalBytesExpectedToSend) {
    //during the progress
}];

NSMutableURLRequest *request = [[AFHTTPRequestSerializer serializer]  multipartFormRequestWithMethod:@"POST" URLString:kUploadImageURL parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
    [formData appendPartWithFileData:UIImageJPEGRepresentation(image, 0.5) name:@"uploadFile" fileName:@"image" mimeType:@"image/jpeg"];
} error:nil];

NSURLSessionDataTask *uploadTask = [manager uploadTaskWithStreamedRequest:request progress:&progress completionHandler:^(NSURLResponse *response, id responseObject, NSError *error) {
    if (!error) {
        //handle upload success
    } else {
        //handle upload failure
    }
}];
[uploadTask resume];