Question

我有一个应用程序，允许用户从他们的iPhone发送测试电子邮件。我的应用程序调用一个方法来激活撰写邮件功能，如下所示：

-(void)displayComposerSheet
{

    //set up a way to cancel the email here
    //picker is an instance of MSMailComposeViewController already declared in the .h file

    [picker setSubject:@"Test Mail"];

    // Set up recipients

    // Attach an image to the email
    NSString *path = [[NSBundle mainBundle] pathForResource:@"Icon" ofType:@"png"];
    NSData *myData = [NSData dataWithContentsOfFile:path];
    [picker addAttachmentData:myData mimeType:@"image/png" fileName:@"Icon"];

    // Fill out the email body text
    NSString *emailBody = @"This is a test mail.";
    [picker setMessageBody:emailBody isHTML:NO];

    [self presentModalViewController:picker animated:YES];
    NSLog(@"mail is working");

}


- (void)mailComposeController:(MFMailComposeViewController*)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError*)error
{
    emailLabel.hidden = NO;
    // Notifies users about errors associated with the interface
    switch (result)
    {
        case MFMailComposeResultCancelled:
            emailLabel.text = @"Mail sending canceled.";
            break;
        case MFMailComposeResultSaved:
            emailLabel.text = @"Mail saved.";
            break;
        case MFMailComposeResultSent:
        {
            emailLabel.text = @"Mail sent.";
            NSLog(@"It's away!");


            UIAlertView *emailAlertView = [[UIAlertView alloc] initWithTitle:@"Sent!" message:@"Mail sent successfully." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
            [emailAlertView show];
            [self dismissModalViewControllerAnimated:YES];
            [self.navigationController popViewControllerAnimated:YES];


        }
            break;
        case MFMailComposeResultFailed:
        {
            emailLabel.text = @"Mail sending failed.";


        }
            break;
        default:
        {
            emailLabel.text = @"Mail not sent.";

        }
        break;
    }

}

我的问题是，当撰写电子邮件功能处于活动状态时，我无法退出此功能并返回我的应用程序。摆脱这种情况的唯一方法是实际进行并发送消息。导航栏左上角有一个默认的“取消”栏按钮，点击后会给我三个选项：“删除草稿”，“保存草稿”和“取消”。如果我选择“删除草稿”，它除了将我返回到撰写邮件屏幕外什么都不做。有没有办法允许用户在启动撰写邮件功能后允许用户返回应用程序，但在发送之前？有没有办法在“取消”栏按钮中添加额外的功能来实现这一目标？

感谢所有回复的人。

Answer 1

您必须使用MFMessageComposeViewControllerDelegate方法实施- (void)messageComposeViewController:(MFMessageComposeViewController *)controller didFinishWithResult:(MessageComposeResult)result。

您将在此方法中关闭您的消息视图。

编辑：我与MFMailComposeViewControllerDelegate混淆，但其目的与MFMessageComposeViewControllerDelegate相同

Answer 2

使用...didFinishWithResult:方法查看您自己的代码：

    case MFMailComposeResultCancelled:
        emailLabel.text = @"Mail sending canceled.";
        break;
    case MFMailComposeResultSaved:
        emailLabel.text = @"Mail saved.";
        break;
    case MFMailComposeResultSent:
    {
        emailLabel.text = @"Mail sent.";
        NSLog(@"It's away!");


        UIAlertView *emailAlertView = [[UIAlertView alloc] initWithTitle:@"Sent!" message:@"Mail sent successfully." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
        [emailAlertView show];
        [self dismissModalViewControllerAnimated:YES];
        [self.navigationController popViewControllerAnimated:YES];


    }

当结果为MFMailComposeResultSent时，您正在关闭模态视图控制器并弹出导航堆栈，这会导致邮件撰写视图控制器消失，并弹出堆栈以删除显示的视图控制器撰写视图控制器。但是，当结果为MFMailComposeResultCancelled时，您只需设置一些标签的文本。 MFMailComposeResultSaved也是如此。如果您希望撰写视图控制器在用户取消或保存时消失，则需要关闭这些情况下的消息撰写视图控制器。

Answer 3

您应该在视图控制器中添加此方法

- (void)mailComposeController:(MFMailComposeViewController*)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError*)error {
    [self becomeFirstResponder];
    [self dismissViewControllerAnimated:YES completion:nil];
}

希望这个可以帮助一个人。

Answer 4

设置MFMailComposeViewController的委托 MFMailComposeViewController * mailcomposer = [[MFMailComposeViewController alloc] init];

mailcomposer.mailComposeDelegate = self;

并使用此委托方法 - （void）mailComposeController：（MFMailComposeViewController *）controller didFinishWithResult：（MFMailComposeResult）结果错误：（NSError *）错误

在iOS中需要帮助解雇电子邮件编辑器屏幕

4 个答案: