iOS:如何通过MFMailComposeController发送消息后如何获取消息正文，主题和收件人

我正在通过以下方法发送电子邮件:

I am sending email via following method:

-(void) sendEmailOpenControllerWithSubject:(NSString *)subject messsageBody:(NSString *) message
{
    MFMailComposeViewController* controller = [[MFMailComposeViewController alloc] init];
    controller.mailComposeDelegate = self;
    [controller setSubject:subject];
    [controller setMessageBody:message isHTML:NO];
    [controller setToRecipients:[[NSArray alloc] initWithObjects:currentProspect.email, nil]];
    if (controller) [self presentModalViewController:controller animated:YES];
}

我正在设置邮件正文主题和收件人，但是用户可能会在MailComposer中更改这些属性.

I am setting message body subject and recipient but it is likely that user changes these attribute in MailComposer.

我需要什么:

因此，我想在发送电子邮件后获取诸如邮件正文，主题和收件人之类的内容.用户可能已通过邮件编辑器更改了这些设置.

So I want to get the contents like message body,subject and recipients after the email is sent. As it is possible that user has changed these via mail composer.