MFMessageComposeViewController 取消按钮不起作用

Question

我使用此块向联系人发送消息，发送后，后退按钮在那里，但是当我触摸它时没有任何反应。 请帮帮我:)

-(IBAction) InviteIt:(id) sender{


    if ([MFMessageComposeViewController canSendText]) {
        MFMessageComposeViewController *messageComposer =
        [[MFMessageComposeViewController alloc] init];
        messageComposer.messageComposeDelegate = self;
        NSString *message = @"You have more body buddies than you think at: http://www.itunes.com/app/JoyChain ";
        [messageComposer setBody:message];
        messageComposer.recipients = [NSArray arrayWithObjects:_itsnum, nil];
        messageComposer.messageComposeDelegate = self;
        [self presentViewController:messageComposer animated:YES completion:nil];

    }

}

Answer 1

你忘记实现mailComposeController:didFinishWithResult:吗？...

- (void) mailComposeController:(MFMailComposeViewController *)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError *)error
{
    switch (result)
    {
        case MFMailComposeResultCancelled:
            NSLog(@"Mail cancelled");
            break;
        case MFMailComposeResultSaved:
            NSLog(@"Mail saved");
            break;
        case MFMailComposeResultSent:
            NSLog(@"Mail sent");
            break;
        case MFMailComposeResultFailed:
            NSLog(@"Mail sent failure: %@", [error localizedDescription]);
            break;
        default:
            break;
    }

    // Close the Mail Interface
    [controller dismissViewControllerAnimated:YES completion:nil];
}

来自苹果文档：

// The mail compose view controller delegate method
- (void)mailComposeController:(MFMailComposeViewController *)controller
              didFinishWithResult:(MFMailComposeResult)result
              error:(NSError *)error
{
    [self dismissModalViewControllerAnimated:YES];
}

但是您可以根据您的目标处理所有情况......

Answer 2

这是 Swift 4、iOS 11 的答案

func mailComposeController(_ controller: MFMailComposeViewController, didFinishWith result: MFMailComposeResult, error: Error?) {
        print("Emailing attempt, error="+(error?.localizedDescription)!)        
        switch (result){
        case MFMailComposeResult.cancelled:
            print("Mail cancelled");
            break;
        case MFMailComposeResult.saved:
            print("Mail saved");
            break;
        case MFMailComposeResult.sent:
            print("Mail sent");
            break;
        case MFMailComposeResult.failed:
            print("Mail sent failure: %@", error?.localizedDescription);
            break;
        default:
            break;
        }
        // Close the Mail Interface
        controller.dismiss(animated: true)
    }

Answer 3

正确答案是设置控制器的messageComposeDelegate ，并定义以下委托方法：

- (void)messageComposeViewController:(MFMessageComposeViewCont‌​roller *)controller
                 didFinishWithResult:(MessageComposeResult)result {

  [self dismissModalViewControllerAnimated:YES];
  if (result == MessageComposeResultCancelled)
    NSLog(@"Message cancelled");
  else if (result == MessageComposeResultSent)
    NSLog(@"Message sent");
  else
    NSLog(@"Message failed");
}

MFMessageComposeViewController的答案基于MFMailComposeViewController而不是MFMessageComposeViewController

Answer 4

如果有人需要它，messageComposeDelegate 方法可以翻译成 Swift (3)：

func messageComposeViewController(_ controller: MFMessageComposeViewController, didFinishWith result: MessageComposeResult) {
    controller.dismiss(animated: true)
}

Answer 5

这是 Swift 4、iOS 11 的答案

case MFMailComposeResult.cancelled:
            print("Mail cancelled");
            break;
        case MFMailComposeResult.saved:
            print("Mail saved");
            break;
        case MFMailComposeResult.sent:
            print("Mail sent");
            break;
        case MFMailComposeResult.failed:
            print("Mail sent failure: %@", error?.localizedDescription);
            break;
        default:
            break;
        }

Answer 6

就像答案所说的那样，您需要在委托中解雇。 我的问题是我正在设置delegate而不是messageComposeDelegate （或电子邮件版本的mailComposeDelegate ）。

确保您设置了正确的委托 :)