ios - 未调用 MFMailComposeViewController 委托(delegate)

Question

即使我正在编写以下代码，我也无法调用 Mail composer 委托(delegate)方法:

-(void)openMailComposerInViewController:(UIViewController *)hostController{
if ([MFMailComposeViewController canSendMail])
{
    // Email Subject
    NSString *emailTitle = @"Test Email";
    // Email Content
    NSString *messageBody = @"Test Email";
    // To address
    NSArray *toRecipents = [NSArray arrayWithObject:@"support@test.com"];

    mailComposer = [[MFMailComposeViewController alloc] init];
    mailComposer.mailComposeDelegate = self;
    [mailComposer setSubject:emailTitle];
    [mailComposer setMessageBody:messageBody isHTML:NO];
    [mailComposer setToRecipients:toRecipents];

    // Present mail view controller on screen

    [hostController presentViewController:mailComposer animated:YES completion:NULL];
    mailController = hostController;
}
else
{
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Failure"
                                                    message:@"Your device doesn't support the composer sheet"
                                                   delegate:nil
                                          cancelButtonTitle:@"OK"
                                          otherButtonTitles:nil];
    [alert show];
}
}

pragma mark - 邮件

- (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
[mailController dismissViewControllerAnimated:YES completion:NULL];
}

我不想自己调用邮件编辑器

但是，我的委托(delegate)没有被调用。请帮忙。单击取消或发送邮件按钮时应用程序崩溃

Answer 1

我遇到过这个问题，我的问题是我有以下代码:

self.mailComposer.mailComposeDelegate = self
self.mailComposer = MFMailComposeViewController()

我在初始化 mailComposer 对象之前设置委托(delegate)。我只是将这两行切换到这个并且它起作用了:

 self.mailComposer = MFMailComposeViewController()
 self.mailComposer.mailComposeDelegate = self