ios – 不在窗口层次结构中的模态视图控制器

当应用程序启动时,我将获得AppDelegate中的用户位置,当我获得准确性时,我需要AppDelegate将Nsnotification发送到我的应用程序的起始页面(标签栏控制器的索引0).

收到通知后,此视图会尝试发送包含用户坐标和其他数据的电子邮件,但只要出现MFMailComposeViewController,我就会收到以下错误：

Warning: Attempt to present <MFMailComposeViewController: 0x98a0270> on <UITabBarController: 0x988c630> whose view is not in the window hierarchy!

我错过了什么？

谢谢.

编辑：添加一些代码……

这是我在AppDelegate.m中得到的：

- (void) LOCATIOnManager:(CLLOCATIOnManager *)manager didupdateToLOCATIOn:(CLLOCATIOn *)newLOCATIOn fromLOCATIOn:(CLLOCATIOn *)oldLOCATIOn {
NSUserDefaults *phonenumbers = [NSUserDefaults standardUserDefaults];
NSDate *eventDate = newLOCATIOn.timestamp;
NSTimeInterval howRecent = [eventDate timeIntervalSinceNow];
if (abs(howRecent) < 10.0) {
    [self LOCATIOnupdate:newLOCATIOn];
    smsLoc = newLOCATIOn;
    if ([[phonenumbers objectForKey:@"sendSMS"] isEqualToString:@"yes"]) {
        [[NsnotificationCenter defaultCenter] postNotificationName:@"sendSMS" object:nil];
    } else if ([[phonenumbers objectForKey:@"sendEmail"] isEqualToString:@"yes"]) {
        [[NsnotificationCenter defaultCenter] postNotificationName:@"sendEmail" object:nil];
    }

}
}

然后,在我的第一个视图控制器中,我有：

- (void)viewDidLoad
{
[[NsnotificationCenter defaultCenter] addObserver:self SELEctor:@SELEctor(sendSMS:) name:@"sendSMS" object:nil];
[[NsnotificationCenter defaultCenter] addObserver:self SELEctor:@SELEctor(sendEmail:) name:@"sendEmail" object:nil];
}

最后,“sendSMS”的选择器(另一个非常相似)：

- (void)sendSMS: (Nsnotification *)notification {
NSUserDefaults *phonenumbers = [NSUserDefaults standardUserDefaults];
if ([phonenumbers objectForKey:@"first"] || [phonenumbers objectForKey:@"second"]) {
        MFmessageComposeViewController *controller = [[MFmessageComposeViewController alloc] init];
        if ([MFmessageComposeViewController canSendText]) {
            AppDelegate *deleg = (AppDelegate *)[[UIApplication sharedApplication] delegate];
            controller.body = [NSString StringWithFormat:@"some message with coordinates %.4f - %.4f",[deleg currentLOCATIOn].coordinate.latitude,[deleg currentLOCATIOn].coordinate.longitude];
            controller.recipients = [NSArray arrayWithObjects:[phonenumbers objectForKey:@"first"],[phonenumbers objectForKey:@"second"],nil];
            controller.messageComposeDelegate = self;
            [self presentModalViewController:controller animated:YES];
        }
    }
}
}

第二次编辑：添加更多代码.

UITabBarController *tabBarController = [[UITabBarController alloc] init];
tabBarController.delegate = self;
tabBarController.SELEctedIndex = 0;
[[tabBarController.tabBar.items objectATindex:0] settitle:NSLocalizedString(@"Home",nil)];
[[tabBarController.tabBar.items objectATindex:1] settitle:NSLocalizedString(@"requests",nil)];
[[tabBarController.tabBar.items objectATindex:2] settitle:NSLocalizedString(@"Account",nil)];
[[tabBarController.tabBar.items objectATindex:3] settitle:NSLocalizedString(@"SetTings",nil)];
//some other controls from DB
[[tabBarController.tabBar.items objectATindex:1] setBadgeValue:[NSString StringWithFormat:@"%d",number]];

tabbarController是通过IB制作的,但我在AppDelegate中添加了上面的代码,因为我需要本地化标签栏项目并为其中一个添加徽章.
我在这里做错了吗？