ios - NSURLResponse 在模拟器中很快出现，但在实际设备上它会在一段时间后出现或返回 NULL

Question

我正在创建一个在每个 View Controller 上调用 Web 服务的应用程序。该应用程序在模拟器上运行良好，但在实际设备上，它运行速度非常慢，或者有时会返回空响​​应，这就是应用程序因服务器的空响应而崩溃的原因。有什么解决方案可以解决这个问题。我对 Objective-C 编程很陌生。请建议我一种解决问题的方法。非常感谢。:)

在这里，我添加了向网络服务发送请求并接收响应的代码部分。

{
    NSURL *url = [NSURL URLWithString:@"http://www.someurl.com/somewebservice.asmx"];
    NSMutableURLRequest *theRequest = [NSMutableURLRequest requestWithURL:url];
    NSString *msgLength = [NSString stringWithFormat:@"%d", [soapMessage length]];

    [theRequest addValue:@"somehost.in" forHTTPHeaderField:@"Host"];
    [theRequest addValue:@"someUrl/someWebMethod" forHTTPHeaderField:@"SOAPAction"];
    [theRequest addValue:@"text/xml; charset=utf-8" forHTTPHeaderField:@"Content-Type"];
    [theRequest addValue:msgLength forHTTPHeaderField:@"Content-Type"];
    [theRequest setHTTPMethod:@"POST"];
    [theRequest setHTTPBody:[soapMessage dataUsingEncoding:NSUTF8StringEncoding]];    [theRequest setHTTPBody: [soapMessage dataUsingEncoding:NSUTF8StringEncoding]];

    NSURLConnection *theConnection =
    [[NSURLConnection alloc] initWithRequest:theRequest delegate:self];

    NSURLResponse *response1 = [[NSURLResponse alloc] init];;
    self.webResponseData = [NSURLConnection sendSynchronousRequest:theRequest returningResponse:&response error:&error];

    self.response = [[NSURLResponse alloc] init];
}

-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
    NSLog(@"Printing response...\n");
    NSLog(@"%@",response);
}


-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
    [self.webResponseData  appendData:data];
}

Answer 1

您正在使用 sendSynchronousRequest。不。从不，从不，从不在主线程上同步网络。