Open Radar

 
Summary:

A collection view with 2 sections before update:
 - section 0 has 4 cells
 - section 1 has 0 cells

After update:
 - section 0 should have 5 cells
 - section 1 should have 0 cells

reloading the sections in performBatchUpdates: crashes with 'NSInternalInconsistencyException', reason: 'attempt to create view animation for nil view'

[self.collectionView performBatchUpdates:^{
		[self.collectionView reloadSections:[NSIndexSet indexSetWithIndexesInRange:NSMakeRange(0, 2)]];
	} completion:nil];

Steps to Reproduce:
- see summary

Expected Results:
- No crash

Actual Results:
- crash

Regression:

Notes:

Assertion failure in -[UICollectionViewAnimation initWithView:viewType:finalLayoutAttributes:startFraction:endFraction:animateFromCurrentPostion:deleteAfterAnimation:customAnimations:], /BuildRoot/Library/Caches/com.apple.xbs/Sources/UIKit_Sim/UIKit-3512.60.7/UICollectionView.m:369
2016-09-05 21:55:25.960 app-dev[29987:3658222] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'attempt to create view animation for nil view'
*** First throw call stack:
(
	0   CoreFoundation                      0x0000000105e31d85 __exceptionPreprocess + 165
	1   libobjc.A.dylib                     0x0000000104f07deb objc_exception_throw + 48
	2   CoreFoundation                      0x0000000105e31bea +[NSException raise:format:arguments:] + 106
	3   Foundation                          0x0000000104b51d5a -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 198
	4   UIKit                               0x000000010890cbc9 -[UICollectionViewAnimation initWithView:viewType:finalLayoutAttributes:startFraction:endFraction:animateFromCurrentPostion:deleteAfterAnimation:customAnimations:] + 258
	5   UIKit                               0x000000010892c6f8 -[UICollectionView _viewAnimationsForCurrentUpdate] + 4103
	6   UIKit                               0x000000010893100c __62-[UICollectionView _updateWithItems:tentativelyForReordering:]_block_invoke1656 + 197
	7   UIKit                               0x000000010814c680 +[UIView(Animation) performWithoutAnimation:] + 65
	8   UIKit                               0x00000001089303b7 -[UICollectionView _updateWithItems:tentativelyForReordering:] + 3241
	9   UIKit                               0x000000010892b148 -[UICollectionView _endItemAnimationsWithInvalidationContext:tentativelyForReordering:] + 15572
	10  UIKit                               0x0000000108932497 -[UICollectionView _performBatchUpdates:completion:invalidationContext:tentativelyForReordering:] + 415
	11  UIKit                               0x00000001089322d5 -[UICollectionView _performBatchUpdates:completion:invalidationContext:] + 74
	12  UIKit                               0x0000000108932278 -[UICollectionView performBatchUpdates:completion:] + 53