Question

我使用AFNetworking3.0在iOS上传一些图像，代码如下所示， images 是UIImage的数组。我有两个问题：

在进度块中，当uploadProgress.fractionCompleted等于1.0时打印日志A，在completionHandler块的头部打印日志B，然后我找到了日志A的时间和B差别很大。有什么不对或正常吗？
当我上传多张图片时，为了获得更好的性能和更少的上传时间，我应该创建多个请求或者如下所示，这是正确的选择吗？

代码如下：

NSMutableURLRequest *request = [[AFHTTPRequestSerializer serializer] multipartFormRequestWithMethod:@"POST" URLString:URL_IMAGE_SERVER parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {           
  for(UIImage *eachImage in images) {
    NSData *imageData = UIImageJPEGRepresentation(eachImage, 0.5);
    [formData appendPartWithFileData:imageData name:@"upload_picture" fileName:@"filename.jpg" mimeType:@"image/jpeg"];
  }
} error:nil];
AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];
manager.responseSerializer = [AFHTTPResponseSerializer serializer];
NSURLSessionUploadTask *uploadTask;
uploadTask = [manager
  uploadTaskWithStreamedRequest:request
  progress:^(NSProgress * _Nonnull uploadProgress) {
     // This is not called back on the main queue.
     // You are responsible for dispatching to the main queue for UI updates
      dispatch_async(dispatch_get_main_queue(), ^{
   });
 }
  completionHandler:^(NSURLResponse * _Nonnull response, id  _Nullable responseObject, NSError * _Nullable error) {
     if (error) {
     } else {
     }
  }];
[uploadTask resume];

为什么completionHandler回调被称为延迟然后AFNetworking上传多个图像的进度（它的1.0）

0 个答案: