BradB132

@interface TTBaseAnimator : NSObject

@property (nonatomic) NSTimeInterval duration;
- (NSTimeInterval)transitionDuration:(id<UIViewControllerContextTransitioning> )transitionContext;

@end

BradB132

@interface TTPushController ()

@property (nonatomic, strong) TTInteractivePinchTransition* transition;
@property (nonatomic, strong) UIPinchGestureRecognizer* pinch;

@end

// ...

- (void)viewDidLoad

BradB132

@protocol TTInteractivePinchTransitionDelegate <NSObject>
-(void)delegateShouldPerformSegue:(TTInteractivePinchTransition*)transition
							pinch:(UIPinchGestureRecognizer*)pinch;
@end

@interface TTInteractivePinchTransition : UIPercentDrivenInteractiveTransition

@property (nonatomic, weak) id<TTInteractivePinchTransitionDelegate> delegate;

-(void)handlePinch:(UIPinchGestureRecognizer*)pinch;

BradB132

- (id <UIViewControllerInteractiveTransitioning>)navigationController:(UINavigationController *)navigationController
                          interactionControllerForAnimationController:(id <UIViewControllerAnimatedTransitioning>) animationController
{
	if([_mostRecentController respondsToSelector:@selector(navigationController:interactionControllerForAnimationController:)])
	{
		return [(id<UINavigationControllerDelegate>)_mostRecentController navigationController:navigationController
							   interactionControllerForAnimationController:animationController];
	}
	return nil;
}

BradB132

@interface TTNavigationController ()

@property (nonatomic, weak) UIViewController* mostRecentController;

@end

// ...

- (id <UIViewControllerAnimatedTransitioning>)navigationController:(UINavigationController *)navigationController
                                   animationControllerForOperation:(UINavigationControllerOperation)operation

BradB132

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.delegate = self;
}

BradB132

fromController.view.hidden = YES;

BradB132

[fromController.view removeFromSuperview];

BradB132

//remove this line
//[transitionContext completeTransition:finished];

//use this code instead:

//put the original stuff back in place if the user cancelled
if(transitionContext.transitionWasCancelled)
{
	[toController.view removeFromSuperview];
	[container addSubview:fromController.view];

BradB132

#pragma mark - UINavigationControllerDelegate

- (id <UIViewControllerInteractiveTransitioning>)navigationController:(UINavigationController *)navigationController
                          interactionControllerForAnimationController:(id <UIViewControllerAnimatedTransitioning>) animationController
{
	if([animationController isKindOfClass:[TTPushAnimator class]])
		return _transition;
	return nil;
}