CODEWITHSUNDEEP
uitableviewcore-dataswift3
stevenpcurtis
stevenpcurtis

Reputation: 2001

InsertRow with NSFetchedResultsControllerdelegate

This should be trivial but I can't get it working.

I want to move a row in a UITableView in a NSFetchedResultsControllerDelegate.

I can easily delete rows, but inserting doesn't seem to work (NSInternalInconsistencyException).

I am trying

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    let destinationindex = IndexPath(item: 0, section: 0)
    tableView.deleteRows(at: [indexPath], with: .fade)
    tableView.insertRows(at: [destinationindex], with: .fade)
}

I have also tried

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    let delobject = fetchedResultsController?.object(at: indexPath)
    fetchedResultsController?.managedObjectContext.delete(delobject!)
    fetchedResultsController?.managedObjectContext.insert(delobject!)
}

Of course a simple delete works; for example swipe to delete:

override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
    if editingStyle == .delete {
        if (indexPath.row != 0) {
            let delobject = fetchedResultsController?.object(at: indexPath)
            fetchedResultsController?.managedObjectContext.delete(delobject!)
        }
    }
}

Upvotes: 0

Views: 100

Answers (1)

shallowThought
shallowThought

Reputation: 19602

Your data model must fit the tableView so number of items in data equals number of rows in tableView.

A FetchedResultsController based TableView reflects the results of a CoreData fetch request. Inserting a row in the UITableView means inserting a new entry in CoreData.

And that is what you want to do: Create a new entry in Core Data (Like you do already do when deleting a row).

Upvotes: 1

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