如果存在多個視圖控制器，如何關閉模態視圖控制器

Question

我有一個具有表視圖的視圖控制器A，並且基於行選擇，我將以模態方式打開另一個視圖控制器B。 我還為我的應用程序實現了不活動計時器。 現在，當B出現並且A在呈現控制器時，由於用戶的不活動，另一個視圖控制器“不活動”視圖控制器C將以模態方式在B之上打開。這意味着我擁有A，然后B處於A之上，C處於頂部B.現在，用戶單擊了C中的一個按鈕以注銷，而我只能關閉C。但是從未關閉View ControllerB。

不活動是使用觸摸事件和通知實現的，並且通知在當前視圖的頂部以模態形式顯示不活動視圖控制器，如以下代碼中所述。

- (void) applicationDidTimeout:(NSNotification *) notif
{
    NSLog(@"Application Did Timeout ...");

    BCDSessionInactivityViewController *sessionView=[[UIStoryboard storyboardWithName:@"Main" bundle:nil] instantiateViewControllerWithIdentifier:@"InactivityViewController"];

    sessionView.modalPresentationStyle = UIModalPresentationFormSheet;
    sessionView.preferredContentSize =  CGSizeMake(838,340);
    UIViewController *parentController = self.parentViewController;
    NSLog(@"presenting view controller is %@", [parentController class]);

    [[self topViewController]presentViewController:sessionView animated:YES completion:nil];


}


- (UIViewController *)topViewController{
    return [self topViewController:[UIApplication sharedApplication].keyWindow.rootViewController];
}



- (UIViewController *)topViewController:(UIViewController *)rootViewController
{
    if (rootViewController.presentedViewController == nil) {
        return rootViewController;
    }

    if ([rootViewController.presentedViewController isMemberOfClass:[UINavigationController class]]) {
        UINavigationController *navigationController = (UINavigationController *)rootViewController.presentedViewController;
        UIViewController *lastViewController = [[navigationController viewControllers] lastObject];
        return [self topViewController:lastViewController];
    }

    UIViewController *presentedViewController = (UIViewController *)rootViewController.presentedViewController;
    return [self topViewController:presentedViewController];
}

有什么辦法我也可以解雇控制器B嗎？

在關閉視圖控制器C的View Controller C方法中，我根據建議編輯了代碼，但是View Controller B仍然沒有被關閉。

- (IBAction)logoutbtn:(id)sender
{
    NSLog(@"logout is called");
    if ([self.presentingViewController isKindOfClass:[BCDScanReviewViewController class]] || [[[F7CheckScanner instance]checkFrontScanned] isEqualToString:@"checkFrontScanned"])
         {
             NSLog(@"check front scanned %@",[[F7CheckScanner instance]checkFrontScanned]);
             [[F7CheckScanner instance]scanBackOfCheckNoData];
         }
    [sessionTimer invalidate];
    sessionTimer = nil;
    [[BCDTimeManager sharedTimerInstance]stopIdleTimer];

    [self dismissViewControllerAnimated:YES completion:^(){

        [self.presentingViewController.presentingViewController dismissViewControllerAnimated:YES completion:^(){;
             BCDThankYouViewController  *thankuView=[[UIStoryboard storyboardWithName:@"Main" bundle:nil] instantiateViewControllerWithIdentifier:@"ThankyouView"];
             [[self topViewController ]presentViewController:thankuView animated:YES completion:nil];
         }];
    }];



    UIViewController *parentController = self.presentingViewController;
    NSLog(@"presenting view controller is %@", [parentController class]);
   // [self dismissViewControllerAnimated:YES completion:^() {
   //     [parentController performSegueWithIdentifier:COMMON_VC_TO_THANK_YOU_VC sender:self];
   // }];


}

Answer 1

你可以用C做類似的事情，

[self.presentingViewController.presentingViewController dismissViewControllerAnimated:YES completion:nil];

要么

[self dismissViewControllerAnimated:YES completion:^{ /* do something when the animation is completed */ }];
[self.parentViewController dismissViewControllerAnimated:YES completion:^{ /* do something when the animation is completed */ }];

根據評論更新：

更換您的

[self dismissViewControllerAnimated:YES completion:^(){

    [self.presentingViewController.presentingViewController dismissViewControllerAnimated:YES completion:^(){;
         BCDThankYouViewController  *thankuView=[[UIStoryboard storyboardWithName:@"Main" bundle:nil] instantiateViewControllerWithIdentifier:@"ThankyouView"];
         [[self topViewController ]presentViewController:thankuView animated:YES completion:nil];
     }];
}];

與

[self.presentingViewController.presentingViewController dismissViewControllerAnimated:YES completion:nil];

 //you can do something here in completion instead of nil. 

如果您要self.presentingViewController.presentingViewController.presentingViewController三個viewcontroller，則可以使用self.presentingViewController.presentingViewController.presentingViewController 。

希望這會有所幫助:)

Answer 2

像這樣解散

//remove
    [self removeFromParentViewController];
    [self didMoveToParentViewController:nil];
    [self.view removeFromSuperview];

Answer 3

感謝大家的建議。 我在其他SO posts的幫助下解決了這個問題。

-(void)dismissModalStack {
    UIViewController *vc = self.presentingViewController;
    while (vc.presentingViewController) {
        vc = vc.presentingViewController;
    }

    NSLog(@"Dismissing the view controller at root of view hiearchy: %@", [vc class]);

    [vc dismissViewControllerAnimated:YES completion:^() {
        BCDThankYouViewController  *thankuView=[[UIStoryboard storyboardWithName:@"Main" bundle:nil] instantiateViewControllerWithIdentifier:@"ThankyouView"];
        [[self topViewController ]presentViewController:thankuView animated:YES completion:nil];
    }];
}