iphoneios5uipageviewcontrollerright-to-left

RTL languages uipageviewcontroller animation


I know this question is typique and it was asked many times in the forum, but I still cannot solve my problem, so please if any body can help be that would be GREAT :)

I am creating a book application in the arabic languages and I need to perform the transitions of the uipageviewcontroller from right to left. And thats all I have to say.

One more thing (if I hadn't explain very well my self) I have the exact need as this thread: How to change UIPageViewController direction of paging curl animation but I couldn't manage to make the solution they spoke about, so if someone can explain me or give me a link where I can have how to do it that would be more than enough :)


Solution

  • It can be done in this way

    1. Swap the code of pageViewController's datasource from viewControllerBeforeViewController to viewControllerAfterViewController

    2. Change UIPageViewControllerSpineLocationMin to UIPageViewControllerSpineLocationMax

    To check that, start Page-Based Application template as Universal and change the following in ModelController.m

    - (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController
    {
        NSUInteger index = [self indexOfViewController:(DataViewController *)viewController];
        if (index == NSNotFound) {
            return nil;
        }
    
        index++;
        if (index == [self.pageData count]) {
            return nil;
        }
        return [self viewControllerAtIndex:index storyboard:viewController.storyboard];
    }
    
    - (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController
    {
        NSUInteger index = [self indexOfViewController:(DataViewController *)viewController];
        if ((index == 0) || (index == NSNotFound)) {
            return nil;
        }
    
        index--;
        return [self viewControllerAtIndex:index storyboard:viewController.storyboard];
    }
    

    and change UIPageViewControllerSpineLocationMin to UIPageViewControllerSpineLocationMax and swipe the condition of (indexOfCurrentViewController % 2 == 0) in "RootViewController.m"

    - (UIPageViewControllerSpineLocation)pageViewController:(UIPageViewController *)pageViewController spineLocationForInterfaceOrientation:(UIInterfaceOrientation)orientation
    {
        if (UIInterfaceOrientationIsPortrait(orientation) || ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone)) {
            UIViewController *currentViewController = [self.pageViewController.viewControllers objectAtIndex:0];
            NSArray *viewControllers = [NSArray arrayWithObject:currentViewController];
            [self.pageViewController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:NULL];
    
            self.pageViewController.doubleSided = NO;
            return UIPageViewControllerSpineLocationMax;
        }
    
        DataViewController *currentViewController = [self.pageViewController.viewControllers objectAtIndex:0];
        NSArray *viewControllers = nil;
    
        NSUInteger indexOfCurrentViewController = [self.modelController indexOfViewController:currentViewController];
        if (indexOfCurrentViewController == 0 || indexOfCurrentViewController % 2 == 0) {
            UIViewController *previousViewController = [self.modelController pageViewController:self.pageViewController viewControllerBeforeViewController:currentViewController];
            viewControllers = [NSArray arrayWithObjects:previousViewController, currentViewController, nil];
        } else {
            UIViewController *nextViewController = [self.modelController pageViewController:self.pageViewController viewControllerAfterViewController:currentViewController];
            viewControllers = [NSArray arrayWithObjects:currentViewController, nextViewController, nil];
        }
        [self.pageViewController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:NULL];
    
    
        return UIPageViewControllerSpineLocationMid;
    }
    

    Source: PageViewControllers Apple Doc