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我有一个客户在他的设备上测试一个应用程序,他使用的是带有 iOS 6.1.3 的 iPhone 3GS。

该应用程序包含一个简单的部分,您可以在其中共享有关该应用程序的信息等。

他报告的问题是,当邮件编写器打开 (presentViewController) 应用程序时,它会在邮件窗口显示后立即自动关闭。因此它会上升,然后再次直接下降,结果与取消电子邮件相同。

我完全不知道为什么只有这个单独的测试仪报告了这个问题。它在模拟器 iOS 6.1 和 7.0 上运行良好,在 iPhone 4、4S 和 5 等所有其他设备上运行良好。这是代码,也许我做错了 3GS 无法编译:

#pragma mark - Share to mail
// Share mail button
- (IBAction)shareTo_mail_BtnClicked:(id)sender
{
    [HUD showUIBlockingIndicatorWithText:@"Laddar mail"];

    // Email Subject
    NSString *emailTitle = PROMO_TEXT;
    // Email Content
    NSString *messageBody = SHARED_INFO_TEXT;

    // If mail account can't bee found
    if(![MFMailComposeViewController canSendMail]) {

        [HUD hideUIBlockingIndicator];

// Alert the user that no mail account is connected to the phone
            UIAlertView *warningAlert = [[UIAlertView alloc] initWithTitle:@"Ett fel inträffade" message:@"Kontrollera att du har ett mail-konto anslutet till telefonen." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
            [warningAlert show];
            return;

        }else {

            NSLog(@"Mail account found!");

        }

    MFMailComposeViewController *mc = [[MFMailComposeViewController alloc] init];
    mc.mailComposeDelegate = self;
    [mc setSubject:emailTitle];
    [mc setMessageBody:messageBody isHTML:NO];

    [self presentViewController:mc animated:YES completion:nil];
    [HUD hideUIBlockingIndicator];
}

// Mail did finish with result
- (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
    [self dismissViewControllerAnimated:YES completion:nil];
}
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