Ios <；NSMutableURLRequest:0x1c0c7ae0>；目标C中的{URL:（null）}

下面的代码有问题

-(void)AddEmpService:(NSDictionary *)params
{

    recordResults = FALSE;
    OutPutStringName = [[NSMutableString alloc] init];
    [OutPutStringName appendString: @"string"];

    NSString *urlstr =[NSString stringWithFormat:@"http://www.seen.com/SeenApi/Service.svc/EmpService?type=Insert&Id=&ClassId=%@&Name=%@&Desg=%@&Age=%@&Add=%@&Sal=%@&Gend=%@&Phone=%@&EmpId=%@",[params objectForKey:@"Id"],[params objectForKey:@"EmpName"],[params objectForKey:@"EmpDesignation"],[params objectForKey:@"EmpAge"],[params objectForKey:@"EmpAddress"],[params objectForKey:@"EmpSalary"],[params objectForKey:@"EmpGender"],[params objectForKey:@"EmpPhone"],[params objectForKey:@"EmpId"]];

    NSLog(@"dict is %@",params);
    urlstr=[urlstr stringByReplacingOccurrencesOfString:@" " withString:@"%20"];
    NSLog(@"%@",urlstr);
    NSURL *url=    [NSURL URLWithString:urlstr];
    NSMutableURLRequest *theRequest = [NSMutableURLRequest requestWithURL:url];
    NSLog(@"the request %@",theRequest);
    [theRequest addValue: @"text/xml; charset=utf-8" forHTTPHeaderField:@"Content-Type"];
    NSURLConnection *theConnection = [[NSURLConnection alloc] initWithRequest:theRequest delegate:self];
    if( theConnection )
    {
        webData = [NSMutableData data];
    }
    else
    {
        NSLog(@"theConnection is NULL");
    }

}

NSLog（@“%@”，urlstr）；是

但是得到空值 NSLog（@“请求%@”，请求）

请求{URL：（null）}
2017-11-21 14:07:36.262电磁脉冲[7070:2394869]与组件错误

请帮助我找出问题所在。请尝试使用以下方法：

NSMutableURLRequest * theRequest = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:[urlstr stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]]]];

---

字符串中有两个连续的

%

字符。强烈建议使用

NSURLComponents

和

NSURLQueryItem

组合URL。它隐式处理百分比编码。请您更正字符串@vadianI can't，因为我不知道字典的确切内容。但是，最好使用

stringByAddingPercentEncodingWithAllowedCharacters

来添加正确的百分比编码，而不是

stringByReplacingOccurrencesOfString

。

the request <NSMutableURLRequest: 0x1c0c7ae0> { URL: (null) }
2017-11-21 14:07:36.262 Emp[7070:2394869] ERROR with theConenction

NSMutableURLRequest * theRequest = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:[urlstr stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]]]];