我正在开发的应用程序有一个选项卡控制器。
当应用程序启动时,我在AppDelegate中获取用户位置,当我获得所需的准确度时,AppDelegate会向我的应用程序起始页面(选项卡控制器的索引0)发送一个NSNotification。
在接收到通知后,此视图尝试使用用户坐标和其他数据发送电子邮件,但是一旦呈现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!
我漏掉了什么?
谢谢。
编辑:添加一些代码...
这是我在AppDelegate.m中的代码:
- (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(另一个也非常相似):
- (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已通过IB创建,但我在AppDelegate中添加了上面的代码,因为我需要本地化选项卡栏项目并向其中一个添加标记。
我在这里做错了什么吗?