UICollectionViewFlowLayout EXC_ARITHMETIC Crash When Calling layoutAttributesForItemAtIndexPath in layoutSubviews
| Originator: | bryn.bodayle | ||
| Number: | rdar://46744145 | Date Originated: | 12/14/18 |
| Status: | Duplicate | Resolved: | 12/17/18 |
| Product: | iOS + SDK | Product Version: | 12.1 |
| Classification: | Crash | Reproducible: | Always |
Summary: UICollectionViewFlowLayout is crashing internally due to a divide by zero issue under a particular set of circumstances when I try to call layoutAttributesForItemAtIndexPath in layoutSubviews. Sample project to to consistently reproduce included. Steps to Reproduce: 1. Layout a UICollectionView with UICollectionViewFlowLayout normally with 1+ items and a normal view size. 2. Inside of layoutSubviews for the view containing the UICollectionView call layoutAttributesForItemAtIndexPath on the UICollectionView. 2. Perform steps 1 and 2 on the same UICollectionView except this time with 0 items and a view height of 0. 3. Then perform the original steps 1 and 2 on the same UICollectionView. Expected Results: The UICollectionView should return the correct layout attributes for the item at the given index path without crashing. Actual Results: The UICollectionView crashes internally. Version/Build: iOS 9.3 through iOS 12.1 Configuration: Xcode 10.1 Attached sample project: https://www.dropbox.com/s/grcmvhbrfsnojq8/UICollectionViewFlowLayoutDivideByZeroCrash.zip?dl=0 ---- Closed as duplicate of 46370295
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