搜索的时候遇到汉字问题

//需要转换成 NSUTF8StringEncoding    

NSString *str1 =@"鞋";

    NSString *str = [NSStringstringWithFormat:@"http://lanrenapp.sinaapp.com/iphone/search/goodslist?start=0&num=20&keyword=%@&version=1.0",[str1stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];

    

    //将ascll转换成汉字

    NSLog(@"%@",[urlStrstringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding]);