NSString *IP =@"0.0.0.0";

   //http://61.4.185.48:81/g/（中国天气网的接口）

    NSURL *url = [NSURLURLWithString:@"http://61.4.185.48:81/g/"];

    NSURLRequest *request = [NSURLRequestrequestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicytimeoutInterval:1.0];

   NSURLResponse *response = nil;

   NSError *error = nil;

   NSData *data = http://www.mamicode.com/[NSURLConnectionsendSynchronousRequest:request returningResponse:&response error:&error];

   if (error) {

        NSLog(@"Failed to get WAN IP Address!\n%@", error);

    }else {

        NSString *responseStr = [[NSStringalloc] initWithData:dataencoding:NSUTF8StringEncoding];

        IP = responseStr;

    }

   NSLog(@"%@",IP);

   return IP;

iOS 获取城市IP