線程1：在MFMailComposeViewController的dismissModalViewController上執行EXEC_BAD_ACCESS（嘗試iOS 5.1、5、4.3）

Question

好吧，這已經困擾了我一段時間了...

我已經檢查過，所有其他問題/答案都與非ARC項目有關。

每當我出現MFMCvc並迅速取消消息時，我在iPhone上都會收到Thread1：EXEC_BAD_ACCESS錯誤消息。 在iPad上工作正常，或者如果我靜置一會兒（例如30秒或更長時間）

有什么建議嗎？ （除了放置計時器，直到計時器啟動后才解雇？）

順便說一句，我用MFMessageComposeViewController做同樣的事情，它在iPhone和iPad上都能正常工作。

這是我的代碼來展示它

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];
    }
}

這是我解雇的地方

-(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）不行： [self dismissModalViewControllerAnimated:NO]; -需要為： [controller dismissModalViewControllerAnimated:NO]; ？ 您要關閉MFMailComposeViewController。

2）MFMailComposeViewController可能還沒有保留。 當我使用此類時，我為控制器創建了一個屬性。 這可能值得嘗試。

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

接着

// 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中

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

Answer 2

將[self dismissModalViewControllerAnimated：NO]移動到didFinishWithResult函數的頂部。 換句話說，在顯示警報視圖之前，請關閉郵件視圖。 我不確定這是否可以消除崩潰，但是無論如何，您應該這樣做。