Custom Segue Pushing/Popping UIViewControllers

Question

I'm trying to implement an iBooks-like flip transition as a storyboard. The segue should push resp. pop the destinationViewController onto/from the UINavigationControllers stack.

I can push viewcontrollers in my segues perform method but I am not able to pop. When I pop the controller right after creating my flip animation the animation does not run and its callback - that should perform [[UIApplication sharedApplication] endIgnoringInteractionEvents] gets never called and my App results dead.

So I tried to push/pop in the animationDidStop:anim:flag delegate method but it never gets called with the flag set to true.

I assume that the segue is deallocated before the delegate method gets called. What else could I do?

Answer 1

Forgive me if I am completely misunderstanding this question, but it seems like you just want to do a basic horizontal flip back and forth between two view controllers. And even if you've already figured this out, maybe it will help anyone else who has the same question.

(1) In your storyboard (that has ViewController A & B) create a Modal Segue from A to B. Give it an identifier (showViewControllerB) and choose Transition:Flip Horizontal.

We set up the protocol and delegates:

(2a) In ViewControllerB.h add above @interface:

@class ViewControllerB;

@protocol ViewControllerBDelegate
    - (void)viewControllerBDidFinish:(ViewControllerB *)controller;
@end

(2b) Add the delegate as a property:

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

(3a) In ViewControllerB.m synthesize:

@synthesize delegate;

(3b) And delegate in the method to flip back:

- (IBAction)flipBack:(id)sender
{
    [self.delegate viewControllerBDidFinish:self];
}

(4) In ViewControllerA.h add at the very top #import "ViewControllerB.h" and on the end of @interface <ViewControllerBDelegate>

(5a) In ViewControllerA.m add the method to conform to the protocol:

- (void)viewControllerBDidFinish:(ViewControllerB *)controller
{
    [self dismissModalViewControllerAnimated:YES];
}

(5b) Then set it as the delegate in prepareForSegue:

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([[segue identifier] isEqualToString:@"showViewControllerB"]) {
        [[segue destinationViewController] setDelegate:self];
    }
}

I hope this answers your question. If I misunderstood, just let me know.