How to iOS 7 Intaraction Transtion - NavigationController

How to iOS 7 Intaraction Transtion (NavigationController)

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1.Return animator object in UINavigationControllerDelegate method.

- (id)navigationController:(UINavigationController *)navigationController animationControllerForOperation:(UINavigationControllerOperation)operation fromViewController:(UIViewController *)fromVC toViewController:(UIViewController *)toVC
{
    NKRBaseAnimator*    animator;
    animator = [[NKRBackAnimator alloc] init];
    animator.reverse = (operation == UINavigationControllerOperationPop);
    animator.duration = 0.3f;
    return animator;
}

1.Return UIViewControllerInteractiveTansitioning object in UINavigationControllerDelegate method.

- (id)navigationController:(UINavigationController *)navigationController interactionControllerForAnimationController:(id)animationController
{
    return self.interactiveTransition;
}

NKRBaseInteraction.h

#import 
@interface NKRBaseInteraction : UIPercentDrivenInteractiveTransition
@end

NKRBaseInteraction.m

#import "NKRBaseInteraction.h"

@implementation NKRBaseInteraction

// This is important! if not override this method, animateTransition: was executed twice.
- (CGFloat)completionSpeed
{
    return 1 - self.percentComplete;
}

@end

2.Push or Pop view controller in UIGestureRecognizerStateBegan.

if (recognizer.state == UIGestureRecognizerStateBegan) {
        // Create a interactive transition
        self.interactiveTransition = [[NKRBaseInteraction alloc] init];
        
        if (translation.y > 0) {
            // Push view controller
            ViewController*  viewController;
            viewController = [[UIStoryboard storyboardWithName:@"Main" bundle:nil] instantiateViewControllerWithIdentifier:@"ViewController"];
            viewController.view.backgroundColor = [UIColor colorWithRed:(rand()%255)/255.0f green:(rand()%255)/255.0f blue:(rand()%255/255.0f) alpha:1.0f];
            [self.navigationController pushViewController:viewController animated:YES];
        }
        else {
            // Pop view controller
            [self.navigationController popViewControllerAnimated:YES];
        }
    }

3.Do updateInteractiveTransition: in UIGestureRecognizerStateChanged.

else if (recognizer.state == UIGestureRecognizerStateChanged) {
        // if an interactive transitions is 100% completed via the user interaction, for some reason
        // the animation completion block is not called, and hence the transition is not completed.
        // This glorious hack makes sure that this doesn't happen.
        // see: https://github.com/ColinEberhardt/VCTransitionsLibrary/issues/4
        if (fraction >= 1.0)
            fraction = 0.99;
        
        // Update the interactive transition's progress
        [self.interactiveTransition updateInteractiveTransition:fraction];
    }

4.Do finishInteractiveTransition and cancelInteractiveTransition in UIGestureRecognizerStateEnded and UIGestureRecognizerStateCancelled

else if (recognizer.state == UIGestureRecognizerStateEnded ||
             recognizer.state == UIGestureRecognizerStateCancelled) {
        // Finish or cancel the interactive transition
        if (fraction > 0.5) {
            [self.interactiveTransition finishInteractiveTransition];
        }
        else {
            [self.interactiveTransition cancelInteractiveTransition];
        }
        
        // Clear interaction
        self.interactiveTransition = nil;
    }