NSFetchedResultsControllerからコンテンツを受け取るUICollectionViewがあります。 データは複数のAPIエンドポイントからのものです(サーバーの設計は私の手にはない)。 最初の呼び出しはメタデータを配信し、各エントリ(> 10.000)よりも関連するデータを取得するためのAPI-Callが必要です。CoreDataの更新中にUICollectionViewのNSFetchedResultsControllerを置き換えるときにクラッシュする
CollectionViewは、いくつかの性質のためにフィルタリングすることができ、各フィルタは、ユーザーがフィルタリングを変更した場合ので、私は新しいものと現在のFRCを交換する必要があります異なるsectionNameKeyPath
が必要です。しかし、CoreDataが更新されると、アプリはクラッシュすることがあります
*** Assertion failure in -[UICollectionView _endItemAnimationsWithInvalidationContext:tentativelyForReordering:], /BuildRoot/Library/Caches/com.apple.xbs/Sources/UIKit_Sim/UIKit-3512.60.7/UICollectionView.m:4422
*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'attempt to delete item 9 from section 0 which only contains 1 items before the update'
クラッシュを回避する方法はありますか?
EDIT:NSFetchedResultsControllerDelegateため追加コード:
#pragma mark - NSFetchedResultsControllerDelegate
- (void)controllerWillChangeContent:(NSFetchedResultsController *)controller
{
_objectChanges = [NSMutableDictionary dictionary];
_sectionChanges = [NSMutableDictionary dictionary];
}
- (void)controller:(NSFetchedResultsController *)controller
didChangeSection:(id <NSFetchedResultsSectionInfo>)sectionInfo
atIndex:(NSUInteger)sectionIndex
forChangeType:(NSFetchedResultsChangeType)type
{
if (type == NSFetchedResultsChangeInsert || type == NSFetchedResultsChangeDelete) {
NSMutableIndexSet *changeSet = _sectionChanges[@(type)];
if (changeSet != nil) {
[changeSet addIndex:sectionIndex];
} else {
_sectionChanges[@(type)] = [[NSMutableIndexSet alloc] initWithIndex:sectionIndex];
}
}
}
- (void)controller:(NSFetchedResultsController *)controller didChangeObject:(id)anObject
atIndexPath:(NSIndexPath *)indexPath forChangeType:(NSFetchedResultsChangeType)type
newIndexPath:(NSIndexPath *)newIndexPath
{
NSMutableArray *changeSet = _objectChanges[@(type)];
if (changeSet == nil) {
changeSet = [[NSMutableArray alloc] init];
_objectChanges[@(type)] = changeSet;
}
switch(type) {
case NSFetchedResultsChangeInsert:
[changeSet addObject:newIndexPath];
break;
case NSFetchedResultsChangeDelete:
[changeSet addObject:indexPath];
break;
case NSFetchedResultsChangeUpdate:
[changeSet addObject:indexPath];
break;
case NSFetchedResultsChangeMove:
[changeSet addObject:@[indexPath, newIndexPath]];
break;
}
}
- (void)controllerDidChangeContent:(NSFetchedResultsController *)controller
{
NSMutableArray *moves = _objectChanges[@(NSFetchedResultsChangeMove)];
if ([moves count] > 0) {
NSMutableArray *updatedMoves = [[NSMutableArray alloc] initWithCapacity:[moves count]];
NSMutableIndexSet *insertSections = _sectionChanges[@(NSFetchedResultsChangeInsert)];
NSMutableIndexSet *deleteSections = _sectionChanges[@(NSFetchedResultsChangeDelete)];
for (NSArray *move in moves) {
NSIndexPath *oldIndexPath = move[0];
NSIndexPath *newIndexPath = move[1];
if ([deleteSections containsIndex:[oldIndexPath section]]) {
if (![insertSections containsIndex:[newIndexPath section]]) {
NSMutableArray *changeSet = _objectChanges[@(NSFetchedResultsChangeInsert)];
if (changeSet == nil) {
changeSet = [[NSMutableArray alloc] initWithObjects:newIndexPath, nil];
_objectChanges[@(NSFetchedResultsChangeInsert)] = changeSet;
} else {
[changeSet addObject:newIndexPath];
}
}
} else if ([insertSections containsIndex:[newIndexPath section]]) {
NSMutableArray *changeSet = _objectChanges[@(NSFetchedResultsChangeDelete)];
if (changeSet == nil) {
changeSet = [[NSMutableArray alloc] initWithObjects:oldIndexPath, nil];
_objectChanges[@(NSFetchedResultsChangeDelete)] = changeSet;
} else {
[changeSet addObject:oldIndexPath];
}
} else {
[updatedMoves addObject:move];
}
}
if ([updatedMoves count] > 0) {
_objectChanges[@(NSFetchedResultsChangeMove)] = updatedMoves;
} else {
[_objectChanges removeObjectForKey:@(NSFetchedResultsChangeMove)];
}
}
NSMutableArray *deletes = _objectChanges[@(NSFetchedResultsChangeDelete)];
if ([deletes count] > 0) {
NSMutableIndexSet *deletedSections = _sectionChanges[@(NSFetchedResultsChangeDelete)];
[deletes filterUsingPredicate:[NSPredicate predicateWithBlock:^BOOL(NSIndexPath *evaluatedObject, NSDictionary *bindings) {
return ![deletedSections containsIndex:evaluatedObject.section];
}]];
}
NSMutableArray *inserts = _objectChanges[@(NSFetchedResultsChangeInsert)];
if ([inserts count] > 0) {
NSMutableIndexSet *insertedSections = _sectionChanges[@(NSFetchedResultsChangeInsert)];
[inserts filterUsingPredicate:[NSPredicate predicateWithBlock:^BOOL(NSIndexPath *evaluatedObject, NSDictionary *bindings) {
return ![insertedSections containsIndex:evaluatedObject.section];
}]];
}
UICollectionView *collectionView = self.collectionView;
[collectionView performBatchUpdates:^{
NSIndexSet *deletedSections = _sectionChanges[@(NSFetchedResultsChangeDelete)];
if ([deletedSections count] > 0) {
[collectionView deleteSections:deletedSections];
}
NSIndexSet *insertedSections = _sectionChanges[@(NSFetchedResultsChangeInsert)];
if ([insertedSections count] > 0) {
[collectionView insertSections:insertedSections];
}
NSArray *deletedItems = _objectChanges[@(NSFetchedResultsChangeDelete)];
if ([deletedItems count] > 0) {
[collectionView deleteItemsAtIndexPaths:deletedItems];
}
NSArray *insertedItems = _objectChanges[@(NSFetchedResultsChangeInsert)];
if ([insertedItems count] > 0) {
[collectionView insertItemsAtIndexPaths:insertedItems];
}
NSArray *reloadItems = _objectChanges[@(NSFetchedResultsChangeUpdate)];
if ([reloadItems count] > 0) {
[collectionView reloadItemsAtIndexPaths:reloadItems];
}
NSArray *moveItems = _objectChanges[@(NSFetchedResultsChangeMove)];
for (NSArray *paths in moveItems) {
[collectionView moveItemAtIndexPath:paths[0] toIndexPath:paths[1]];
}
} completion:^(BOOL finished) {
[[self refreshControl] endRefreshing];
}];
_objectChanges = nil;
_sectionChanges = nil;
}
どのようにデリゲートコールバックを処理していますか?個々の変更をアニメーション化するだけですか? – Wain
私は両方を試しました 私はperformBatchUpdatesを使用します:controllerDidChangeContentで、ブロックではitemChangesとsectionChangesの2つのmutableDictionariesを処理します。 しかし、テストのために、私は単純な "reloadData"をcontrollerDidChangeContentで試しました。 – MatzeLoCal
変更処理のコードと変更内容をコアデータに保存する方法を示します – Wain