使用 AFNetworking 2.0 上传进度

Question

我知道这个问题在这个网站上很受欢迎，但是在搜索了大部分答案后，我找不到解决方案。 我的应用程序是将图像上传到远程 url。我尝试了几种上传方式，都成功了：
(1) 使用 AFURLSessionManager

AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];
[(AFHTTPResponseSerializer*)manager.responseSerializer setAcceptableContentTypes:[NSSet setWithObjects:@"multipart/form-data", nil]];
NSURLSessionUploadTask *uploadTask = [manager uploadTaskWithStreamedRequest:request progress:&progress completionHandler:^(NSURLResponse *response, id responseObject, NSError *error) {
    if (error) {
        NSDictionary *userInfo=[error userInfo];
        id responseError=[userInfo objectForKey:@"AFNetworkingOperationFailingURLResponseErrorKey"];
        if ([responseError isKindOfClass:[NSHTTPURLResponse class]]) {
            NSHTTPURLResponse *reponse=(NSHTTPURLResponse*)responseError;
            if (reponse.statusCode==200) {
                result(YES);
            } else {
                result(NO);
            }
        } else {
            result(NO);
        }
    } else {
        result(YES);
    }
}];
[uploadTask resume];

为此，我使用 KVO 来监控进度，但没有运气。

(2) 使用AFHTTPRequestOperation

AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
    [operation setUploadProgressBlock:^(NSUInteger bytesWritten, long long totalBytesWritten, long long totalBytesExpectedToWrite) {
        NSLog(@"total bytes written: %lld",totalBytesWritten);
    }];
    [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
        result(YES);
    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        if (operation.response.statusCode==200) {
            result(YES);
        } else {
            result(NO);
        }
    }];
    [operation start];

仅在开始上传时立即显示日志“写入的总字节数：”一次，文件体积为 100%。

(3) 使用 AFHTTPRequestOperationManager

AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
    manager.requestSerializer = [AFHTTPRequestSerializer serializer];
    manager.responseSerializer = [AFHTTPResponseSerializer serializer];
    AFHTTPRequestOperation *operation =
    [manager HTTPRequestOperationWithRequest:request
                                     success:^(AFHTTPRequestOperation *operation, id responseObject) {
                                         NSLog(@"Success %@", responseObject);
                                         result(YES);
                                     } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
                                         if (operation.response.statusCode==200) {
                                             result(YES);


              } else {
                                         result(NO);
                                     }
                                 }];

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

// 5. Begin!
[operation start];

=> 与第二个解决方案的结果相同。

请注意，所有解决方案都已成功上传，但进度未更新（NSProgress 或阻止）。

Answer 1

NSMutableURLRequest *request = [[AFHTTPRequestSerializer serializer] multipartFormRequestWithMethod:@"POST" URLString:@"<your upload url>" parameters:@{<parameters dict> } constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
         _STRONGREF(strongSelf);

            NSString  *name=@"file_data_name";
            [formData appendPartWithFileURL:[NSURL fileURLWithPath:path] name:name fileName:<file Path> mimeType:@"image/png" error:nil];//u can use data as well with other method
        }

    } error:nil];
    [request setTimeoutInterval:180];
    [request setValue:@"VAlue_your" forHTTPHeaderField:@"feild"];//set headers
    AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];
    NSProgress *progress = nil;
    NSURLSessionUploadTask *uploadTask = [manager uploadTaskWithStreamedRequest:request progress:&progress completionHandler:^(NSURLResponse *response, id responseObject, NSError *error) {
        if (error) {
            NSLog(@"Error: %@", error);
        } else {
            NSLog(@"%@ %@", response, responseObject);
        }
    }];

    NSLog(@"%@",progress);
    [uploadTask resume];

我的宏是

#define  _WEAKREF(obj)         __weak typeof(obj)ref=obj;
#define  _STRONGREF(name)      __strong typeof(ref)name=ref;\
                               if(!name)return ;\

Answer 2

在你的 NSProgress 上设置一个观察者。

类似

[uploadTask resume];
[progress addObserver:self
                   forKeyPath:@"fractionCompleted"
                      options:NSKeyValueObservingOptionNew
                      context:NULL];

然后执行

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
{
if ([keyPath isEqualToString:@"fractionCompleted"]) {
    NSProgress *progress = (NSProgress *)object;
    NSLog(@"progress = %f", progress.fractionCompleted);

} else {
    [super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
    }
}

上传任务完成后别忘了移除观察者。

注意：progress.fractionCompleted 返回一个百分比值。以 MB 为单位由您决定。

Answer 3

最后，我找到了没有调用进度块的原因：我上传了一个非常小的图像，大约只有几十 Kb。我尝试上传更大尺寸的文件并调用进度块。根据我的经验，带有 NSProgress 的 KVO 不起作用。取而代之的是，我们可以使用 AFHTTPRequestOperation 或 AFHTTPRequestOperationManager。如果您喜欢手动上传，您可以使用How can I upload a photo to a server with the iPhone? 建议的 NSURLConnection 以及委托方法：
- (void)connection:(NSURLConnection *)connection didSendBodyData:(NSInteger)bytesWritten totalBytesWritten:(NSInteger)totalBytesWritten totalBytesExpectedToWrite:(NSInteger)totalBytesExpectedToWrite { NSLog(@"percent: %d",100*totalBytesWritten/totalBytesExpectedToWrite); }