解决Format string is not a string literal (potentially insecure)问题

/// 字符串格式化化
NSString *GetFormatStr(NSString *str, ...)
{
   va_list args;
   va_start(args, str);
   NSString *result = [[NSString alloc] initWithFormat:str arguments:args];
   va_end (args);
   return result;
}