从 iPhone 中的 MFMailComposeViewController 发送邮件时显示成功警报消息答案

【问题标题】：Display the success alert message when mail send from MFMailComposeViewController in iPhone从 iPhone 中的 MFMailComposeViewController 发送邮件时显示成功警报消息
【发布时间】：2017-12-13 00:54:08
【问题描述】：

当用户使用 MFMailComposeViewController 从 iPhone 成功发送邮件时，我需要显示警报消息。

我尝试使用 didFinishWithResult 委托，但它同时调用了发送和取消，那么我们如何确定我们成功发送了消息？

【问题讨论】：

标签： iphone email mfmailcomposeviewcontroller

【解决方案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];  
}

【讨论】：

【解决方案2】：

我在使用这种方法时遇到了麻烦。在我的应用程序中，我将 MFMailComposeViewController 用于电子邮件，将 MFMessageComposeViewController 用于 SMS 消息，并且两个 didFinishWithResult 例程都使用了与上述方法类似的方法，其中在 VC 关闭之前显示警报。

似乎如果您发送短信，下次您尝试发送电子邮件时，光标将不会出现在电子邮件正文中，并且您无法选择任何文本。同样在调试器中，我收到“wait_fences: failed to receive reply: 10004003”。

我最终只是从应用程序的这一部分中删除了警报视图，问题就消失了。如果有人对此问题有解决方案，我会很高兴听到。

【讨论】：

您需要在模态视图控制器的视图消失后显示警报。您可以将该调用挂钩到模态视图控制器上的 viewDidDisappear: 实现，或者您可以使用 dispatch_after 或 performSelector:afterDelay: 在不同的运行循环上执行一些小技巧

【解决方案3】：

你应该为委托对象实现这个方法...

– mailComposeController:didFinishWithResult:error:

【讨论】：

【解决方案4】：

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

使用这个委托，在这个 MFMailComposeResult 里面是一个枚举

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

【讨论】：

【解决方案5】：

答案的 Swift 版本。

       func sendMail(){
                if MFMailComposeViewController.canSendMail() {
                    let mail = MFMailComposeViewController()
                    mail.mailComposeDelegate = self
                    mail.setToRecipients(["hello@gmail.com"])
                    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.")
        }

【讨论】：