- (void)businessContactWithMail
{
    Class mailClass = (NSClassFromString(@"MFMailComposeViewController"));
    if (mailClass != nil)
    {
        // We must always check whether the current device is configured for sending emails
        if ([mailClass canSendMail])
        {
            MFMailComposeViewController *picker = [[MFMailComposeViewController alloc] init];
            picker.mailComposeDelegate = self;
            [picker setToRecipients:[NSArray arrayWithObject:@""]];
            [picker setSubject:[NSString stringWithFormat:@""]];
            
            UIDevice *device = [UIDevice currentDevice];
            
            NSString *content=[NSString stringWithFormat:@""];
            [picker setMessageBody:content isHTML:NO];
            [self presentViewController:picker animated:YES completion:^{
                
            }];
        }
        else
        {
            [NDUI showAlertWithInfo:@"您的裝置尚未配置郵件賬號" title:@"提示"];
        }
    } else {
        [NDUI showAlertWithInfo:@"您的裝置不支援郵件功能" title:@"提示"];
    }
}
#pragma mark - Mail and SMS delegate
// Dismisses the email composition interface when users tap Cancel or Send.
// Proceeds to update the message field with the result of the operation.
- (void)mailComposeController:(MFMailComposeViewController*)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError*)error
{
    [self dismissViewControllerAnimated:YES completion:nil];
}