20150528 UI考试项目中，使用SHAI加密，生成请求URL

<span style="font-size:18px;">#pragma -mark 利用SHAI加密，求得网络请求URL地址
- (void)getURLOfCategory:(NSString *)city andCategory:(NSString *)category
{
//将要请求的参数传递存储到字典里面
NSMutableDictionary *dic = [NSMutableDictionary dictionaryWithObjectsAndKeys:city,@"city",category,@"category",@"30",@"limit",@"1",@"page", nil];
//利用类方法生成sign值
NSMutableDictionary *signDic = [SignatrueEncryption encryptedParamsWithBaseParams:dic];
NSString *signValue = [signDic objectForKey:@"sign"];
//拼接字符串求得URL
NSString *string = [NSString stringWithFormat:@"/v1/deal/find_deals?appkey=%@&sign=%@&city=%@&category=%@&limit=%d&page=%d",kAPP_KEY,singValue,city,category,30,1];
//对URL进行URLEncode转码（中文转码）
NSString *urlString = [string stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
self.URLStr = [kBASE_SERVER_URL stringByAppendingString:urlString];
}</span>