iOS 7 custom transition glitch

Question

This video shows the issue I am having. http://www.youtube.com/watch?v=C9od_2KZAbs

I am attempting to create a custom push interactive transition using a UIPanGestureRec

Answer 1

As of iOS 7.1, I can reproduce this in simulator but not on an actual device. Anyway, there appears to be a workaround:

self.interactiveTransitionAnimator.completionSpeed = 0.999;

There is a radar for this bug: rdar://14675246

Answer 2

I've got an example on github that works without the glitch. Let me know if you have further questions.

Answer 3

What happens if you call the [transitionContext completeTransition:YES]; immediately after calling finishInteractiveTransition like this:

else if (gestureRecogznier.state == UIGestureRecognizerStateEnded) {

    if ([gestureRecogznier velocityInView:self.view].x < 0) {
        [self.interactiveTransitionAnimator finishInteractiveTransition];
        [transitionContext completeTransition:YES];
    } else {
        [self.interactiveTransitionAnimator cancelInteractiveTransition];
    }

    self.interactiveTransitionAnimator = nil;
}

Answer 4

Or, as matt observed here, you can also either defer the completeTransition or drive the custom interaction controller yourself:

I've seen something similar. I have two possible workarounds. One is to use delayed performance in the animation completion handler:

   } completion:^(BOOL finished) {
            double delayInSeconds = 0.1;
            dispatch_time_t popTime = 
                 dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delayInSeconds * NSEC_PER_SEC));
            dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
                BOOL cancelled = [transitionContext transitionWasCancelled];
                [transitionContext completeTransition:!cancelled];
            });
           self.interacting = NO;
    }];

The other possibility is: don't use percent-drive animation! I've never had a problem like this when driving the interactive custom animation myself manually.