iphone - 线程 1 : EXEC_BAD_ACCESS on MFMailComposeViewController's dismissModalViewController (tried iOS 5. 1、5、4.3)

Question

好吧，这已经困扰我一段时间了......

我已经检查过了，所有其他问题/答案都与非 ARC 项目有关。

每当我展示 MFMCvc 并快速取消消息时，我都会在 iPhone 上收到 Thread1:EXEC_BAD_ACCESS 错误消息。在 iPad 上运行良好，或者如果我让它静置一会儿(比如 30 秒或更长时间)

有什么建议吗？ (除了设置一个计时器并且在计时器结束之前不解雇？)

顺便说一句，我对 MFMessageComposeViewController 做同样的事情，它在 iPhone 和 iPad 上都可以正常工作。

这是我展示它的代码

if (([action isEqualToString:@"EMail"]) && contact.length>0)
{
    MFMailComposeViewController *mailViewController = [[MFMailComposeViewController alloc] init];
    if([MFMailComposeViewController canSendMail]) {
        [mailViewController setSubject:@""];
        [mailViewController setMessageBody:@"" isHTML:NO];
        [mailViewController setToRecipients:[NSArray arrayWithObject:contact]];
        [mailViewController setMailComposeDelegate:self];
        [self presentModalViewController:mailViewController animated:NO];
    }
}

这就是我忽略它的地方

-(void)mailComposeController:(MFMailComposeViewController *)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError *)error
    {
        switch (result)
        {
            case MFMailComposeResultCancelled:
            {
                UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Send EMail" message:@"EMail Has Been Cancelled"
                                                               delegate:self cancelButtonTitle:@"OK" otherButtonTitles: nil];
                [alert show];
            }
                break;
            case MFMailComposeResultFailed:
            {
                NSLog(@"Error");
            }
                break;
            case MFMailComposeResultSent:
            {
                UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Send EMail" message:@"EMail Has Been Sent"
                                                               delegate:self cancelButtonTitle:@"OK" otherButtonTitles: nil];
                [alert show];
            }
                break;
            case MFMailComposeResultSaved:
            {
                UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Send EMail" message:@"EMail Has Been Saved"
                                                               delegate:self cancelButtonTitle:@"OK" otherButtonTitles: nil];
                [alert show];
            }
                break;
            default:
                break;
        }
        [self dismissModalViewControllerAnimated:NO];
    }

Answer 1

1) 行不行:[self dismissModalViewControllerAnimated:NO]; - 需要:[controller dismissModalViewControllerAnimated:NO]; ?您想要关闭 MFMailComposeViewController。

2) MFMailComposeViewController 未保留也可能存在问题。当我使用这个类时，我为 Controller 创建了一个属性。这可能值得一试。

// in the interface definition
 @property (nonatomic, strong) MFMailComposeViewController* mailComposer;

进而

// at creation time
if (([action isEqualToString:@"EMail"]) && contact.length>0)

if(![MFMailComposeViewController canSendMail]) return; // bail early if can't send mail

MFMailComposeViewController *mailViewController = [[MFMailComposeViewController alloc] init];
[mailViewController setSubject:@""];
[mailViewController setMessageBody:@"" isHTML:NO];
[mailViewController setToRecipients:[NSArray arrayWithObject:contact]];
[mailViewController setMailComposeDelegate:self];
[self presentModalViewController:mailViewController animated:NO];

[self setMailComposer: mailViewController];
// if not using ARC then:  [mailViewController release];

然后在 didFinish

 [[self mailComposer] dismissModalViewControllerAnimated:YES];
 [self setMailComposer: nil];