"Swift Core Data" and UISearchController

Question

I have a tableView with NSFetchedResultsController! I have fully completed NSFetchedResultsController's delegate methods and works perfectly! My problem line is presenting a UIAlertController. UIAlertController works well on the tableView, but doesn't works inside of the UISearchController. I'm attempted to delete objects inside of the UISearchController. When I press a delete button Xcode gives me error like so:

Here's codes of my commitEditingStyle method and UIAlertController, UIAlertAction's handler:

`// Override to support editing the table view. override func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) { if editingStyle == .Delete {

        let itemToDelete:Manager = self.fetchedResultsController.objectAtIndexPath(indexPath) as! Manager
        prepareForDelete(itemToDelete)

        // Delete the row from the data source
        //tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: .Fade)
    } else if editingStyle == .Insert {
        // Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
    }    
}

// Delete Action
var itemsToDelete:Manager!

// Delete function

private func prepareForDelete(managedObject:Manager) {

    //
    self.itemsToDelete = managedObject

    // Alert
    let alert:UIAlertController = UIAlertController(title: "Warning!", message: "Do you want to delete this note?", preferredStyle: UIAlertControllerStyle.Alert)

    // Actions
    let deleteAction:UIAlertAction = UIAlertAction(title: "Delete", style: UIAlertActionStyle.Destructive, handler: deleteHandler)

    // Actions
    let cancelAction:UIAlertAction = UIAlertAction(title: "Cancel", style: UIAlertActionStyle.Cancel, handler: nil)

    // Add actions to the alert
    alert.addAction(deleteAction)
    alert.addAction(cancelAction)

    // Present alert
    self.presentViewController(alert, animated: true, completion: nil)
}

func deleteHandler(alert:UIAlertAction) -> Void {

    // Delete from the moc
    if let delete = self.itemsToDelete {
        self.managedObjectContext.deleteObject(delete)
        do {
            // Save changes
            try self.managedObjectContext.save()
        } catch {

        }
        self.itemsToDelete = nil
    }
}`

How to disable UIAlertController ? I do not need alerts inside of the UISearchController. Because this function doesn't work inside of UISearchController

Thanks for your attention!

So if you are searching you don't want the alert to pop up - no deleting? — tktsubota
I want to delete objects with alert on the tableView! It works well. But I can't delete objects inside of the UISearchController , when UISearchController is active. I need alerts on tableView, outside of the UISearchController ! But I do not need inside of this. — Amateur User

tktsubota tktsubota · Accepted Answer · 2016-03-06T02:51:04

You can check if your search controller is active (I'm assuming you have a reference to your search controller in the view controller).

Add this to the beginning of prepareForDelete:

guard !searchController.active else { return }

That code checks if the search controller is not active, but if it is, it doesn't execute any code.

"Swift Core Data" and UISearchController

1 Answers