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POUIPageViewController: display error when user aborts pangesture
 

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  1. POUIPageViewController: display error when user aborts pangesture
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    <p>Here is my problem: I've implemented a calendar in week mode, navigation between weeks is done using a <code>UIPageViewController</code> in pagecurl mode (quite similar to the standard calendar of the iPad). Everything works well except when user aborts the page navigation. So if the calendar is showing the current week and user pan with the finger to show next week but then aborts the gesture and he doesn't turn the page, the datasource will still display the next week instead of staying at the current week.</p> <p>I tried using the method</p> <pre><code> - (void)pageViewController:(UIPageViewController *)pageViewController didFinishAnimating:(BOOL)finished previousViewControllers:(NSArray*)previousViewControllers transitionCompleted:(BOOL)completed </code></pre> <p>and detecting when pangesture is aborted and then manually reset the previous viewcontroller but the result is not good at all.</p> <p>Here is my code for the datasource and delegate methods</p> <pre><code>- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController { if (_pageIsAnimating) { return nil; } [[MCalendarManager sharedCalendar] previousWeek]; MCalendarContentViewController * contentViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"CalendarContentViewController"]; return contentViewController; } - (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController { if (_pageIsAnimating) { return nil; } [[MCalendarManager sharedCalendar] nextWeek]; MCalendarContentViewController * contentViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"CalendarContentViewController"]; return contentViewController; } - (void)pageViewController:(UIPageViewController *)pageViewController willTransitionToViewControllers:(NSArray *)pendingViewControllers { _pageIsAnimating = YES; } - (void)pageViewController:(UIPageViewController *)pageViewController didFinishAnimating:(BOOL)finished previousViewControllers:(NSArray *)previousViewControllers transitionCompleted:(BOOL)completed { if (completed || finished) { // Turn is either finished or aborted _pageIsAnimating = NO; } if (finished &amp;&amp; !completed) {//Turn is aborted //Do something here for not changing the viewcontroller } } </code></pre> <p>Does anyone has an idea how to solve this?</p> <p>Thanks in advance.</p> <p>Regards</p>
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    1. USEmil
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    1. COWhat are you doing in `Do something here for not changing the viewcontroller` ?
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    2. COI tried to manually set the previous viewcontroller using the method [self.pageViewController setViewControllers: direction: animated: completion:]; but the result is not good since I still see the viewcontroller changing to the next one before I set the previous again
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      1. USEmil
    3. COYou should check the order of the `[[MCalendarManager sharedCalendar] previousWeek];` and `[[MCalendarManager sharedCalendar] nextWeek];` methods are called because if a gesture is aborted and the animation is not completed, one of these methods is already called and in case the animation is aborted you should call the opposite method that was first called, so if `nextWeek` is called then you have to call `previousWeek` and vice versa.
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      1. POUIPageViewController: display error when user aborts pangesture
      1. USdanypata
 

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