PageCurl bug from iOS 5.1 to 6.0

After bleeding too much of blood to solve crashing issue while trying to flip the first page(left side) and last page(right side) , finally i have come up with following solution. :)

OLD CODE(iOS 5.1) : when returning nil on the first and last page you will experience the app crash.It works fine in iOS 5.1,but in iOS 6 it wont.

- (UIViewController *)pageViewController:

(UIPageViewController *)pageViewController viewControllerBeforeViewController:

(UIViewController *)viewController

{

    for (UIGestureRecognizer *recognizer in pageController.gestureRecognizers) {

        if ([recognizer isKindOfClass:[UITapGestureRecognizer class]]) {

            recognizer.enabled = NO;

        }

    }

    NSUInteger index = [self indexOfViewController:

                        (MainViewController *)viewController];

    if ((index == 0) || (index == NSNotFound)) {

        return nil;

    }

    

    index--;

    return [self viewControllerAtIndex:index];

}

- (UIViewController *)pageViewController:

(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController

{

    for (UIGestureRecognizer *recognizer in pageController.gestureRecognizers) {

        if ([recognizer isKindOfClass:[UITapGestureRecognizer class]]) {

            recognizer.enabled = NO;

        }

    }

    NSUInteger index = [self indexOfViewController:

                        (MainViewController *)viewController];

    if (index == NSNotFound) {

        return nil;

    }
}

SOLUTION(iOS 6) : After adding the gesture effect to the superview,just call the delegate called -(BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer. What i did is quiet simple, computing the speed of the user flipping the first page and last page (i mean using the gesture recognizer) , i denied the swiping.All you need to do is just paste the following code,and you are DONE!.

- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer

{

    if (pageNum==0) {

        

        if ([(UIPanGestureRecognizer*)gestureRecognizer isKindOfClass:[UIPanGestureRecognizer class]] &&

            [(UIPanGestureRecognizer*)gestureRecognizer velocityInView:gestureRecognizer.view].x > 0.0f) {

            //NSLog(@"Swiping to left on 1st page is denied");

            return NO;

        }

        if ([(UITapGestureRecognizer*)gestureRecognizer isKindOfClass:[UITapGestureRecognizer class]] &&

            [(UITapGestureRecognizer*)gestureRecognizer locationInView:gestureRecognizer.view].x < self.view.frame.size.width/2) {

         //NSLog(@"tapping to left on 1st page is denied");

            return NO;

        }

    }

    

    else if(pageNum ==totalNoOfFiles-1)

    {

        

        if ([(UIPanGestureRecognizer*)gestureRecognizer isKindOfClass:[UIPanGestureRecognizer class]] &&

            [(UIPanGestureRecognizer*)gestureRecognizer velocityInView:gestureRecognizer.view].x < 0.0f) {

            //NSLog(@"Swiping to right on 1st page is denied");

            return NO;

        }

        if ([(UITapGestureRecognizer*)gestureRecognizer isKindOfClass:[UITapGestureRecognizer class]] &&

            [(UITapGestureRecognizer*)gestureRecognizer locationInView:gestureRecognizer.view].x > self.view.frame.size.width/2) {

          //NSLog(@"Tapping to right on 1st page is denied");

            return NO;

        }

    }

    

    return YES;

}

- (UIViewController *)pageViewController:(UIPageViewController*) pageViewController viewControllerBeforeViewController:(UIViewController *)viewController

 {

  int index = [self indexOfViewController:(ChildViewController *)viewController];

                index--;

        

    return [self viewControllerAtIndex:index];

}

- (UIViewController *)pageViewController:

(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController

{

    int index = [self indexOfViewController:(ChildViewController *)viewController];

          

            index++;

     return [self viewControllerAtIndex:index];

}

Hope your life is saved :)