AFNetworking - 获取响应内容长度

Question

我正在使用一个简单的AFNetworking [AFHTTPRequestOperation -initWithRequest:]来下载文件,我想在实际下载文件之前检查响应头"内容长度".如何在AFNetworking中检查响应内容的长度？

Answer 1

使用NSURLResponse的expectedContentLength属性你可以找到长度.

 AFHTTPRequestOperation *op = [[AFHTTPRequestOperation alloc] initWithRequest:request];
    [op setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject)
     {
         NSLog(@"Content-lent: %lld", [operation.response expectedContentLength]);

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