iphone - 如何从 View 和 View Controller 中删除关联？

Question

当我在发送电子邮件后尝试显示 facebook 共享时(使用 MFMailComposeViewController)我收到此错误:

A view can only be associated with at most one view controller at a time! View [EAGLView] is associated with [EmailViewController]. Clear this association before associating this view with [FacebookView].'

[EmailViewController removeFromParentViewController];什么都不做

EmailViewController.view = nil;导致白屏，即使电子邮件表单早已消失。

如何让它忘记我曾经发送过电子邮件并使 View 层次结构恢复到以前的状态？如果我没有发送电子邮件，Facebook 分享就可以使用。

-(IBAction)ShowEmailForm:(char*)pSubject :(char*)pBody :(char*)pTo
{

    Class mailClass = (NSClassFromString(@"MFMailComposeViewController"));

    if (mailClass != nil)
    {
        if ([mailClass canSendMail])
        {
            self.view = eaglView;

            MFMailComposeViewController *picker = [[MFMailComposeViewController alloc] init];
            picker.mailComposeDelegate = self;

            [picker setSubject:[NSString stringWithFormat:@"%s", pSubject]];

            // Set up recipients
            if( pTo != nil )
            {
                NSArray *toRecipients = [NSArray arrayWithObject:[NSString stringWithFormat:@"%s", pTo]];
                [picker setToRecipients:toRecipients];
            }

            // Fill out the email body text
            [picker setMessageBody:[NSString stringWithFormat:@"%s",pBody] isHTML:YES];

            [self presentViewController:picker animated:YES completion:^(){}];
            [picker release];
        }
    }
}

// Dismisses the email composition interface when users tap Cancel or Send. Proceeds to update the message field with the result of the operation.
- (void)mailComposeController:(MFMailComposeViewController*)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError*)error 
{    
    [self dismissViewControllerAnimated:YES completion:^(){ printf("Email form done dismissing.\n"); }];

    printf("Email form dismissed.\n");

    [self removeFromParentViewController];

    //Email was sent.
    if (result == MFMailComposeResultSent)
    {
        printf("Email Sent!\n");

        NSString *pEmail = [self findEmailAddresses:controller.view : 0];

    }
}

Answer 1

已修复。

改变

        self.view = eaglView;

到

        [eaglView addSubview:self.view];