问题：
剖析我的应用程序时，我在功能controllerDidChangeContent中遇到内存泄漏。仪器告诉我，泄漏应该在self.collectionView?.performBatchUpdates({ [unowned self] in行中。但是，由于我已经添加了无主的自我，但没有成功，怎么会有一个记忆周期。您对如何解决此泄漏有任何提示吗？
想法：
这可能是由于在类中声明的数组private var blockOperations = [BlockOperation]()引起的吗？但是不可能将数组设置为弱。
extension CollectionViewController: NSFetchedResultsControllerDelegate {
func controllerWillChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) {
self.blockOperations = []
}
func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, didChange anObject: Any,
at indexPath: IndexPath?, for type: NSFetchedResultsChangeType, newIndexPath: IndexPath?) {
var operation: BlockOperation
switch type {
case .insert:
guard let newIndexPath = newIndexPath else { return }
operation = BlockOperation { [unowned self] in
self.collectionView?.insertItems(at: [newIndexPath])
}
case .delete:
guard let indexPath = indexPath else { return }
operation = BlockOperation { [unowned self] in
self.collectionView?.deleteItems(at: [indexPath])
}
case .update:
guard let newIndexPath = newIndexPath else { return }
operation = BlockOperation { [unowned self] in
self.collectionView?.reloadItems(at: [newIndexPath])
}
case .move:
guard let indexPath = indexPath else { return }
guard let newIndexPath = newIndexPath else { return }
operation = BlockOperation { [unowned self] in
self.collectionView?.deleteItems(at: [indexPath])
self.collectionView?.insertItems(at: [newIndexPath])
}
}
blockOperations.append(operation)
}
func controllerDidChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) {
// in the next line there is the leak shown in Instruments
self.collectionView?.performBatchUpdates({ [unowned self] in
for block in self.blockOperations {
block.start() }
}, completion: { [unowned self] _ in
self.blockOperations.removeAll()
})
updateView()
}
}