ios AFNetWorking上传图片有进度条

MBProgressHUD *HUD = [[MBProgressHUD alloc] init];
        HUD.mode = MBProgressHUDModeAnnularDeterminate;//圆环作为进度条
        HUD.labelColor = [UIColor whiteColor];
        HUD.labelFont = [UIFont systemFontOfSize:13];
        [HUD show:YES];
        [self.view addSubview:HUD];
        
        NSDictionary *dic = @{@"file":@"",@"wname":self.titleTextField.text,@"wdiscription":self.jianJieTextView.text};
        
        AFHTTPRequestOperationManager* _manager = [AFHTTPRequestOperationManager manager];
        
        NSMutableURLRequest* request = [_manager.requestSerializer multipartFormRequestWithMethod:@"POST" URLString:[NSString stringWithFormat:@"%@%@",URL_YUMING,SmallConnoisseur_updateWorks_URL] parameters:dic constructingBodyWithBlock:^(id  _Nonnull formData) {
            
            [formData appendPartWithFileData:UIImageJPEGRepresentation(self.imgView.image, 0.5) name:@"file" fileName:@"/Documents/pic.png" mimeType:@"image/png"];
        } error:nil];
        
        AFHTTPRequestOperation *operation = [_manager HTTPRequestOperationWithRequest:request success:^(AFHTTPRequestOperation * _Nonnull operation, id  _Nonnull responseObject) {
            NSLog(@"----成功---");
            
                dispatch_async(dispatch_get_main_queue(), ^{
                        [self.navigationController popViewControllerAnimated:YES];
                });
            
        } failure:^(AFHTTPRequestOperation * _Nonnull operation, NSError * _Nonnull error) {
            NSLog(@"---失败-");
            HUD.labelText = @"上传失败";
            [HUD hide:YES afterDelay:3];
        }];
        
        
        
        [operation setUploadProgressBlock:^(NSUInteger bytesWritten, long long totalBytesWritten, long long totalBytesExpectedToWrite) {
            NSLog(@"00----1---%ld----",bytesWritten);
            NSLog(@"00----2---%lld----",totalBytesWritten);
            NSLog(@"00----3---%lld----",totalBytesExpectedToWrite);
            NSLog(@"00-------%f--",(float)totalBytesWritten/totalBytesExpectedToWrite);
            
            HUD.progress = (float)totalBytesWritten/totalBytesExpectedToWrite;
            
            if (HUD.progress > 0.9f) {
                HUD.labelText = @"上传完成";
                [HUD hide:YES afterDelay:3];
            }else{
                HUD.labelText = [NSString stringWithFormat:@"当前上传的进度为%.2f",(float)totalBytesWritten/totalBytesExpectedToWrite*100];
            }
            
        }];
        
        [operation start];