在iPhone中，当邮件从MFMailComposeViewController发送时，显示成功警报消息

Question

我需要在用户使用MFMailComposeViewController从iPhone成功发送邮件时显示警告消息。

我尝试使用didFinishWithResult委托，但它同时调用send和cancel，那么我们如何确定我们成功发送消息?

Answer 1

Try this code
-(IBAction)Btn_EmailPressed:(id)sender{
    if (![MFMailComposeViewController canSendMail]) {
        UIAlertView *alert=[[UIAlertView alloc] initWithTitle:@"Alert" message:@"Email cannot be configure." delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [alert show];
        [alert release];
        return;
    }else {
        picker = [[MFMailComposeViewController alloc] init];
        picker.mailComposeDelegate=self;
        [picker setToRecipients:nil];
                [picker setSubject:@"Email"];
                [picker setMessageBody:nil isHTML:NO];
                NSArray *toRecipients = [[NSArray alloc] initWithObjects:lblSite.text,nil];
                [picker setToRecipients:toRecipients];
                [self presentModalViewController:picker animated:YES];
            }
}

- (void)mailComposeController:(MFMailComposeViewController*)mailController didFinishWithResult:(MFMailComposeResult)result error:(NSError*)error {
    NSString *msg1;
    switch (result)
    {
        case MFMailComposeResultCancelled:
            msg1 =@"Sending Mail is cancelled";
            break;
        case MFMailComposeResultSaved:
            msg1=@"Sending Mail is Saved";
            break;
        case MFMailComposeResultSent:
            msg1 =@"Your Mail has been sent successfully";
            break;
        case MFMailComposeResultFailed:
            msg1 =@"Message sending failed";
            break;
        default:
            msg1 =@"Your Mail is not Sent";
            break;
    }
    UIAlertView *mailResuletAlert = [[UIAlertView alloc]initWithFrame:CGRectMake(10, 170, 300, 120)];
    mailResuletAlert.message=msg1;
    mailResuletAlert.title=@"Message";
    [mailResuletAlert addButtonWithTitle:@"OK"];
    [mailResuletAlert show];
    [mailResuletAlert release];
    [self dismissModalViewControllerAnimated:YES];  
}

Answer 2

我在使用这种方法时遇到了麻烦。在我的应用程序中，我使用MFMailComposeViewController的电子邮件和MFMessageComposeViewController的短信和两个didFinishWithResult例程使用类似的方法与上面的一个，在VC被驳回之前显示一个警告。

似乎如果你发送了一条短信，下次你尝试发送电子邮件时，光标不会出现在电子邮件正文中，你也不能选择任何文本。同样在调试器中，我得到"wait_fences: failed to receive reply: 10004003"。

我最终只是从应用程序的这一部分删除了警报视图，问题就消失了。如果有人有解决这个问题的办法，我很乐意听听。

Answer 3

你应该为委托对象实现这个方法…

– mailComposeController:didFinishWithResult:error:

查看这个以获得更多细节…http://developer.apple.com/library/ios/文档/MessageUI/引用/MFMailComposeViewControllerDelegate_protocol/引用/Reference.html #//apple_ref/occ/intf MFMailComposeViewControllerDelegate

Answer 4

(void)mailComposeController:(MFMailComposeViewController*)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError*)error

使用这个委托，在这个委托中MFMailComposeResult是一个enum

enum MFMailComposeResult {
   MFMailComposeResultCancelled,
   MFMailComposeResultSaved,
   MFMailComposeResultSent,
   MFMailComposeResultFailed
};
typedef enum MFMailComposeResult MFMailComposeResult;

Answer 5

Swift版本的答案

       func sendMail(){
                if MFMailComposeViewController.canSendMail() {
                    let mail = MFMailComposeViewController()
                    mail.mailComposeDelegate = self
                    mail.setToRecipients(["[e-mail]"])
                    present(mail, animated: true)
                } else {
                    showSendMailErrorAlert()
                }
            }
        func mailComposeController(_ controller: MFMailComposeViewController, didFinishWith result: MFMailComposeResult, error: Error?) {
            switch result {
                case .cancelled: print("Sending Mail is cancelled")
                case .sent : print("Your Mail has been sent successfully")
                case .saved : print("Sending Mail is Saved")
                case .failed : print("Message sending failed")
            }
            controller.dismiss(animated: true, completion: nil)
        }
        func showSendMailErrorAlert() {
            showAlert(title: "Could Not Send Email", message: "Your device could not send e-mail.  Please check e-mail configuration and try again.")
        }