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POCrash when trying to add section footer to UICollectionView
 

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  1. POCrash when trying to add section footer to UICollectionView
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    <p>I'm trying to add a section footer to a UICollectionView and failing in a way I don't understand.</p> <p>I'm setting up the main cell like this:</p> <pre><code>[collectionView registerClass:[PickerOpenCell class] forCellWithReuseIdentifier:cellIdentifier]; UINib *cellNib = [UINib nibWithNibName:@"PickerOpenCell" bundle:nil]; [collectionView registerNib:cellNib forCellWithReuseIdentifier:cellIdentifier]; UICollectionViewFlowLayout *flowLayout = [[UICollectionViewFlowLayout alloc] init]; flowLayout.scrollDirection = UICollectionViewScrollDirectionVertical; flowLayout.itemSize = CGSizeMake(130, 50); [collectionView setCollectionViewLayout:flowLayout]; </code></pre> <p>The xib is a subclass of UICollectionViewCell, and just contains a UILabel. This all works fine.</p> <p>Now I want to add the section footer, so I add this (interleaved with the code above, so the setCollectionViewLayout call is still the last one in the sequence):</p> <pre><code>[collectionView registerClass:[PickerOpenFooter class] forCellWithReuseIdentifier:footerIdentifier]; UINib *footerNib = [UINib nibWithNibName:@"PickerOpenFooter" bundle:nil]; [collectionView registerNib:footerNib forSupplementaryViewOfKind:UICollectionElementKindSectionFooter withReuseIdentifier:footerIdentifier]; flowLayout.footerReferenceSize = CGSizeMake(130, 2); </code></pre> <p>The xib this time is a subclass of UICollectionReusableView, and contains a view (it's meant to be a horizontal white line between sections). The view's size is 130 x 2.</p> <p>The moment I add the footerReferenceSize line, the app crashes on the setCollectionViewLayoutLine with</p> <p>Terminating app due to uncaught exception 'NSRangeException', reason: '-[__NSArrayM objectAtIndex:]: index 0 beyond bounds for empty array'</p> <p>I have no clue which array this might be, and Google is providing no help. Any ideas? I must have forgotten to hook something up, but I can't find it.</p>
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    1. PTQuestion
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    1. USjanineanne
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    1. VO
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      1. POCrash when trying to add section footer to UICollectionView
      1. USAdetiloye Philip Kehinde
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    1. CODid you ever figure this out? I'm running into the exact same crash now, but for headers. Your post is the only Google result.
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      1. POCrash when trying to add section footer to UICollectionView
      1. USArclite
    2. COSorry, I gave up and put the white line in PickerOpenCell.xib so I could skip having a footer. It's probably a bug but I didn't have time to report it at the time, and I'd have to remember too many details now. If you report it, leave the bug number here and I'll dup it.
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      1. POCrash when trying to add section footer to UICollectionView
      1. USjanineanne
 

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