Apps crashes when centeredIndexPath is being called

[maughray]

Hi,

If number of items is zero, attemp to call collectionView?.centeredIndexPath will cause "divide by zero" crash instead returning nil

Thanks.

[zykyan]

Any fix on this?

[rcobelli]

Hi!

Can you provide some additional context around how you are getting the divide by zero crash? I've been unable to replicate.

You can see a modified version of the BaseCollectionViewController.swift from the example project below. When you load this VC in the example app then centeredIndexPath returns nil as expected.

BaseCollectionViewController.swift

override func viewDidAppear(_ animated: Bool) {
	print(self.infiniteCollectionView!.centeredIndexPath as Any)
}

override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    guard let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as? Cell else {
        fatalError()
    }
    cell.update(index: self.infiniteCollectionView!.indexPath(from: indexPath).row)
    return cell
}

override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    return 0
}

override func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
    collectionView.scrollToItem(at: indexPath, at: self.infiniteCollectionView!.infiniteLayout.scrollDirection == .vertical ? .centeredVertically : .centeredHorizontally, animated: true)
}