Crash on collectionView.deleteSections(...)

If I add a button that is removing some section, it is crashing after scrolling to last section:

@IBAction func didClick(sender: AnyObject) {
        numberOfSections -= 1;
        let set = NSIndexSet(index: 2)
        self.collectionView.deleteSections(set)
    }

Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'UICollectionView received layout attributes for a cell with an index path that does not exist: <NSIndexPath: 0xc000000000003116> {length = 2, path = 49 - 0}'

Can you help me how to resolve this issue?

I simulated on my branch: https://github.com/ostatnicky/CustomCollectionViewLayout

I added

func reload() {
        itemAttributes = nil
        itemsSize = nil
        prepareLayout()
    }

into CustomCollectionViewLayout and call it after deleting section, but it's still crashing when I'm on bottom of collection view.

Hey, I've niled at start of prepareLayout the itemAttributes and itemsSize and it works now. It is a little hot fix but it works.

    override func prepareLayout() {

        itemAttributes = nil
        itemsSize = nil
...

@ostatnicky

@ostatnicky UICollectionViewLayout has a delegate method just for what you're doing.

override func invalidateLayout() {
  super.invalidateLayout()

  itemAttributes = nil
  itemsSize = nil
}

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Crash on collectionView.deleteSections(...) #7

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Crash on collectionView.deleteSections(...) #7

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ostatnicky commented on Sep 29, 2015

ostatnicky commented on Sep 29, 2015

ostatnicky commented on Sep 30, 2015

jkereako commented on Aug 5, 2016

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