这是我第一次使用 AppKit 和NSTableView. 它由NSFetchedResultsController核心数据支持。当数据集发生更改时，Notification将发送：
func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, didChange anObject: Any, at indexPath: IndexPath?, for type: NSFetchedResultsChangeType, newIndexPath: IndexPath?) {
guard let links = self.fetchedResultsController.fetchedObjects else {
return
}
if self.viewContext.hasChanges {
try? self.viewContext.save()
}
self._links = links
NotificationCenter.default.post(name: .reloadLinkList, object: nil)
}
NotificationCenter.default.publisher(for: .reloadLinkList).receive(on: RunLoop.main).sink { notification in
self.list.tableView.reloadData()
self.list.linksModel.selectedRows = IndexSet([])
}
.store(in: &cancellables)
这对于插入和更新数据非常有用。当我尝试删除某些内容时，我得到：
Thread 1: Fatal error: UnsafeRawBufferPointer with negative count
删除选定对象的代码如下：
Thread 1: Fatal error: UnsafeRawBufferPointer with negative count …