Unwind Segue iOS goes back 1 too many VC's

Question

I have a 3 viewcontroller navigation where A presents modal controller B, which presents modal controller C all via segues. C has an unwind segue back to B. It also has an unwind back to A. When I perform action for C to unwind to B, it unwinds but then pops B and goes back to A. This is not what I want, I want it in this case to stay on B. Below are the segues VC C uses.

unwindCancel is for when user clicks on a collectionViewCell and goes back to VC B. prepareForUnwind is just a standard "cancel" button to VC A.

Below is code for didSelectItem to call the unwind in VC C. Below that is prepareForSegue in VC C.

-(void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath{
[self performSegueWithIdentifier:@"unwindCancel" sender:self];
}

-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
    if ([segue.identifier isEqualToString:@"unwindCancel"]) {
        GalleryDetailViewController *detailVC = segue.destinationViewController;
        detailVC.colletionCount = self.indexPathToPass;
    }
}

VC B unwind in .m file

-(IBAction)unwindCancel:(UIStoryboardSegue *)segue{

    [self.collectionView scrollToItemAtIndexPath:self.colletionCount atScrollPosition:UICollectionViewScrollPositionLeft animated:YES];
}

VC A unwind in .m file

-(IBAction)prepareForUnwind:(UIStoryboardSegue *)segue {
}

score 3 · Answer 1 · edited Nov 04 '15 at 14:38

3

When going from C to B, don't use an unwind segue just have C call dismissViewController. If you're committed to using unwind segues, look here specifically section entitle How an Unwind Segue Determines its Destination View Controller

edited Nov 04 '15 at 14:38

itsji10dra

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answered Nov 03 '15 at 13:11

beyowulf

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score 2 · Answer 2 · answered Nov 04 '15 at 14:35

2

I guess you confused an unwind-segue's identifier with unwind-segue's Action method.

If you build an unwind-segue with "prepareForUnwind" action, and then you change this unwind-segue's identifier to "unwindCancel".The problem would appear.

Just make sure the unwind-segue's identifier matches it's action method.

answered Nov 04 '15 at 14:35

wj2061

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There are 2 unwind segues from C - one back to the B and one back to A. – noobsmcgoobs Nov 05 '15 at 03:40
1

@noobsmcgoobs I recreated your demo,the problem does not exist.So I guess you give the segue a wrong name.Put "nslog" in your two unwind methodes, and see which one is called. – wj2061 Nov 05 '15 at 03:53
@noobsmcgoobs This Post is similar to your :http://stackoverflow.com/q/33181577/4975761 – wj2061 Nov 06 '15 at 16:48
The name's not wrong but VC C pops off back to A using `prepareForUnwind` as well. When I dragged the segue from the VC, not the button, to Exit, this doesn't happen. I'll try the solution posted, but on first glance it's not a naming error like the solution. – noobsmcgoobs Nov 07 '15 at 09:15

Unwind Segue iOS goes back 1 too many VC's

2 Answers2