Question

我在我的demp app中实现MFMailComposeViewController。但是，由于某些原因，我触摸后在电子邮件文本字段中添加文本后，我的应用程序崩溃了。但是发送没有添加任何文本的工作正常。

我的Xcode没有显示太多。这是我得到的：

enter image description here

我已经在电子邮件文本字段中设置了初始文本。也许这个问题在这里？请求任何代码，我很乐意将其包含在内。

更新这里有两种方法，当触摸openMail

时，第一种方法UIButton会触发

- (IBAction)openMail:(id)sender
{
    if ([MFMailComposeViewController canSendMail])
    {

    }
    else
    {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Failure"
                                                        message:@"Your device doesn't support the composer sheet"
                                                       delegate:nil
                                              cancelButtonTitle:@"OK"
                                              otherButtonTitles:nil];
        [alert show];
        [alert release];
    }

    if ([MFMailComposeViewController canSendMail])
    {
        MFMailComposeViewController *mailer = [[MFMailComposeViewController alloc] init];

        mailer.mailComposeDelegate = self;

        [mailer setSubject:@"Feedback from Demo App user"];

        NSArray *toRecipients = [NSArray arrayWithObjects:@"myEMAIL@hotmail.com", @"myEMAIL2@gmail.com", nil];
        [mailer setToRecipients:toRecipients];

        NSString *emailBody = @"Happy to hear your feedback!";
        [mailer setMessageBody:emailBody isHTML:NO];

        [self presentModalViewController:mailer animated:YES];

        [mailer release];
    }
    else
    {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Failure"
                                                        message:@"Your device doesn't support the composer sheet"
                                                       delegate:nil
                                              cancelButtonTitle:@"OK"
                                              otherButtonTitles: nil];
        [alert show];
        [alert release];
    }

}

- (void)mailComposeController:(MFMailComposeViewController*)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError*)error
{
    switch (result)
    {
        case MFMailComposeResultCancelled:
            NSLog(@"Mail cancelled: you cancelled the operation and no email message was queued.");
            break;
        case MFMailComposeResultSaved:
            NSLog(@"Mail saved: you saved the email message in the drafts folder.");
            break;
        case MFMailComposeResultSent:
            NSLog(@"Mail send: the email message is queued in the outbox. It is ready to send.");
            break;
        case MFMailComposeResultFailed:
            NSLog(@"Mail failed: the email message was not saved or queued, possibly due to an error.");
            break;
        default:
            NSLog(@"Mail not sent.");
            break;
    }

    // Remove the mail view
    [self dismissModalViewControllerAnimated:YES];
}

Answer 1

可能你正在使用ARC，并且你没有强烈指向你的MFMailComposeViewController，并且在显示之后，ARC正在释放它。

使用

@property (nonatomic,stron) MFMailComposeViewController *mail;

当你初始化MFMailComposeViewController时：

MFMailComposeViewController *mailer = [[MFMailComposeViewController alloc] init];
self.mail = mailer;

Answer 2

你的代码中是否还有这一行：

[mailer release];

如果是这样就是问题所在。如果没有，那么请更新我们的代码示例，使其正是您现在正在使用的。

应用程序崩溃后触摸电子邮件文本MFMailComposeViewController

2 个答案: