ios - RKRequestDelegate TotalBytesExpectedToReceive 始终返回 -1

Question

我正在实现

-(void)request:(RKRequest *)request didReceivedData:(NSInteger)bytesReceived totalBytesReceived:(NSInteger)totalBytesReceived totalBytesExpectedToReceive:(NSInteger)totalBytesExpectedToReceive {
    NSLog(@"totalBytesExpectedToReceive = [%i]  :  totalBytesReceived = [%i]", totalBytesExpectedToReceive, totalBytesReceived);
}

但是我只正确地得到了totalBytesReceived。 totalBytesExpectedToReceive 始终返回 -1。

可能是什么问题？

谢谢

沙尼

Answer 1

RestKit 使用响应中发送的 Content-Length HTTP header 来确定预期长度。我建议您在 AppDelegate 中将日志级别设置为 Trace:

RKLogConfigureByName("RestKit/*", RKLogLevelTrace);

并在日志中找到标题。寻找这样的声明

2011-12-04 17:00:36.564 XXXXXX[56816:15803] D restkit.network:RKResponse.m:197 Headers: {
    Connection = "Keep-Alive";
    "Content-Disposition" = "inline; filename=xxxx.xml";
    "Content-Encoding" = gzip;
    "Content-Length" = 391;
    "Content-Type" = "application/xml";
    Date = "Sun, 04 Dec 2011 16:00:36 GMT";
    "Keep-Alive" = "timeout=15, max=100";
    Server = "Apache/2.2.14 (Ubuntu)";
    Vary = "Accept-Encoding";
}

如果您的输出中缺少“Content-Length”，则 RestKit 无法告诉您预计有多少数据。