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[ASCollectionDataController] Repopulate deleted supplementary nodes if necessary (#1773)

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* Repopulate deleted supplementary nodes if necessary

Fixes 1771

* Fix warning
This commit is contained in:
Eric Horacek
2016-07-09 22:46:29 -07:00
committed by appleguy
parent f39c2ce7e3
commit 3efd01a781
1 changed files with 21 additions and 0 deletions
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21
AsyncDisplayKit/Details/ASCollectionDataController.mm
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@@ -154,11 +154,32 @@
}
}
- (void)prepareForDeleteRowsAtIndexPaths:(NSArray<NSIndexPath *> *)indexPaths
{
for (NSString *kind in [self supplementaryKinds]) {
NSMutableArray<ASIndexedNodeContext *> *contexts = [NSMutableArray array];
[self _populateSupplementaryNodesOfKind:kind atIndexPaths:indexPaths mutableContexts:contexts];
_pendingContexts[kind] = contexts;
}
}
- (void)willDeleteRowsAtIndexPaths:(NSArray<NSIndexPath *> *)indexPaths
{
for (NSString *kind in [self supplementaryKinds]) {
NSArray<NSIndexPath *> *deletedIndexPaths = ASIndexPathsInMultidimensionalArrayIntersectingIndexPaths([self editingNodesOfKind:kind], indexPaths);
[self deleteNodesOfKind:kind atIndexPaths:deletedIndexPaths completion:nil];
// If any of the contexts remain after the deletion, re-insert them, e.g.
// UICollectionElementKindSectionHeader remains even if item 0 is deleted.
NSArray<ASIndexedNodeContext *> *contexts = [_pendingContexts[kind] filteredArrayUsingPredicate:[NSPredicate predicateWithBlock:^(ASIndexedNodeContext *context, NSDictionary *_) {
return [deletedIndexPaths containsObject:context.indexPath];
}]];
[self batchLayoutNodesFromContexts:contexts ofKind:kind completion:^(NSArray<ASCellNode *> *nodes, NSArray<NSIndexPath *> *indexPaths) {
[self insertNodes:nodes ofKind:kind atIndexPaths:indexPaths completion:nil];
}];
[_pendingContexts removeObjectForKey:kind];
}
}