調用didFinishLaunchingWithOptions時，應用崩潰

Question

觸發通知時，我有一個應用程序。當應用程序處於后台時，我會收到一個通知欄，當我點擊該欄時，它會導航到通知集的tableview中。 當我從后台退出應用程序時，我會收到通知，但是在通知欄上點擊時，應用程序將崩潰，因為它沒有獲取tableview的indexpath。

當應用在后台退出並重新加載時，應進入didfinishlaunching。

在appDidFinishLaunching中，我正在調用導航到tableview的方法

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    self.viewController = [[PPViewController alloc] initWithNibName:@"ViewController_iPhone" bundle:nil] ;

     UILocalNotification *notification = [launchOptions objectForKey:              UIApplicationLaunchOptionsLocalNotificationKey];

    if (notification)
        {
            int remedyID = [[notification.userInfo objectForKey:kRemindMeNotificationRemedyIDKey] intValue];
            NSDictionary *reminderDetails =[NSDictionary dictionaryWithObjectsAndKeys:notification.userInfo,@"kRemindMeNotificationDataKey",[NSNumber numberWithInt:remedyID],kRemindMeNotificationRemedyIDKey,nil];

            [_viewController goToReminder:reminderDetails showNotification:YES];

       }
     [application setStatusBarStyle:UIStatusBarStyleBlackTranslucent];
    self.viewController = [[PPViewController alloc] initWithNibName:@"PPViewController" bundle:nil];
    self.window.rootViewController = self.viewController;
    [self.window makeKeyAndVisible];
    return YES;

}

**This is the code which navigates into tableview in another viewcontroller**

- (void)goToReminder:(NSMutableDictionary *)reminderDictionary showNotification:(BOOL)shouldShowNotification

{
    NSIndexPath *selectedSymptIP = [NSIndexPath indexPathForRow:selectedSymptomIndex inSection:keyIndexNumber];

    [self tableView:symptomsTableView didSelectRowAtIndexPath:selectedSymptIP];

}

Answer 1

當您退出應用程序並且應用程序再次啟動時，您的viewController尚未設置。 從通知啟動時，需要檢查是從后台恢復還是正常啟動。

在UIApplicationDelegate協議參考中查看applicationWillEnterForeground和applicationDidBecomeActive ，以了解如何處理從各種狀態恢復應用程序的問題。 另請參閱： http : //developer.apple.com/library/ios/#documentation/iPhone/Conceptual/iPhoneOSProgrammingGuide/ManagingYourApplicationsFlow/ManagingYourApplicationsFlow.html#//apple_ref/doc/uid/TP40007072-CH4-SW3

Answer 2

我能夠解決問題..由於加載錯誤的xib文件而發生崩潰。