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我检查了 stackOverFlow 和其他，在didReceiveData:, didReceiveResponse:NSURLConnectionDataDelegate 版本 4.3 上可用。从 2.3 版到 4.3 版，它们在 NSURLConnectionDelegate 中可用。

看看这些：

http://stackoverflow.com:(10937215)connection-didreceivedata-is-not-call

http://stackoverflow.com:(7862316) ios5 nsurlconnection 方法已弃用

通过检查 SDK 版本，我猜我们可以继承一个特定的类，我还没有测试过。但是我猜是可以实现的。

但问题是我在 iOS 6.0 和 3G 网络上运行，然后它一直因超时错误而失败。在 WIFI 上，didReceiveData:即使我使用 NSURLConnectionDelegate 也会被调用。感觉有点奇怪。

在我扩展 NSURLConnectionDelegate 的类中，这些是要查看的方法。

-(void)connection:(NSURLConnection *)theConnection didReceiveResponse:(NSURLResponse *)response
{
    NSLog(@"Private didReceiveResponse - %d", [response statusCode]);

    if([response statusCode] == 200)
        connectionstatus = YES;
}

- (void)connection:(NSURLConnection *)theConnection didReceiveData:(NSData *)data
{
    self.connectionstatus = YES;

}

- (void)connectionDidFinishLoading:(NSURLConnection*)theConnection 
{
    NSLog(@"Private connectionDidFinishLoading");

    self.connectionstatus = NO;
    [self reinitConnection];
}

-(void)connection:(NSURLConnection *)theConnection didFailWithError:(NSError *)error
{
    self.connectionstatus = NO;
    self.connection= nil;
}


- (void) reinitConnection
{
    self.connectionstatus = YES;
    connectionCount++;
    NSString* urlS = @“VALID url”; //Such as http://google.com
    NSURL *url = [NSURL URLWithString:urlS];
    self.req = [[NSMutableURLRequest alloc] initWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:20.0];
    NSString *appstring =[httpreq appendMyParamsPost:req];
    [req setURL:[NSURL URLWithString:[NSString stringWithFormat:@"%@?%@",[url absoluteString],appstring]]];

    NSString* authValue = @“SomeValue”,
    [req addValue:@"application/vnd.gupshup.privatechat-v1+json" forHTTPHeaderField:@"Accept"];
    [req setValue:@"application/x-www-form-urlencoded; charset=utf-8" forHTTPHeaderField:@"Content-Type"];
    [req addValue:authValue forHTTPHeaderField:@"Authorization"];
    [req setHTTPMethod:@"GET"];

    [self.connection cancel];
    self.connection = nil;
    self.connection = [[NSURLConnection alloc] initWithRequest:req delegate:self startImmediately:YES];
}

有什么问题吗？为什么它专门在 3G 上，虽然在 SDK 级别存在方法 shuffle 的问题，在哪里，它也必须在 WIFI 上发生？

提前致谢。文卡塔劳

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