OC获取ip地址

+(NSString *)getIp{
    NSError *error;NSURL *ipURL = [NSURL URLWithString:@"http://pv.sohu.com/cityjson?ie=utf-8"];
    NSMutableString *ip = [NSMutableString stringWithContentsOfURL:ipURL encoding:NSUTF8StringEncoding error:&error];//判断返回字符串是否为所需数据
    if ([ip hasPrefix:@"var returnCitySN = "]) {
       //删除字符串多余字符串
        NSRange range = NSMakeRange(0, 19);
        [ip deleteCharactersInRange:range];
        NSString * nowIp =[ip substringToIndex:ip.length-1];
        //将字符串转换成二进制进行Json解析
        NSData * data = [nowIp dataUsingEncoding:NSUTF8StringEncoding];
        NSDictionary * dict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];
        NSLog(@"%@",dict);
        return dict[@"cip"] ? dict[@"cip"] : @"";

    }
    return @"";

}