UICollectionView throws an assertion failure in -[UICollectionView _endItemAnimationsWithInvalidationContext:tentativelyForReordering:]

Originator:tzaworowski
Number:rdar://26280932 Date Originated:13-May-2016 05:07 PM
Status:Open Resolved:
Product:iOS Product Version:iOS 9.3 (13E230)
Classification:Bug Reproducible:Always
 
Calling insertItemsAtIndexPaths: on UICollectionView after viewDidLoad but before viewDidAppear: will cause an assertion failure in -[UICollectionView _endItemAnimationsWithInvalidationContext:tentativelyForReordering:]. Calling reloadData in the same scenario doesn't generate the assertion.

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