Swift Saving Deleted Rows To Core Data - swift

Question

Bit of a beginner here so probably shouldn't be trying core data stuff but anyway, I would like to be able to delete a row by swiping. I have done this but it doesn't save the deleted cells and they come back again. I am using a xcdatamodeld file. If anyone can tell me how to save the deleted files to core data that would be great!
Here is my saving data code:
inputAlert.addAction(UIAlertAction(title: "Save", style: .default, handler: { (action:UIAlertAction) in
let taskTextField = inputAlert.textFields?.first
let descTextField = inputAlert.textFields?.last
if taskTextField?.text != "" && descTextField?.text != "" {
taskItem.task = taskTextField?.text
taskItem.desc = descTextField?.text
do {
try self.managedObjectContext.save()
self.loadData()
}catch {
print("Could not save data \(error.localizedDescription)")
}
}
Here is the code I have so far for the deleting:
override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
if editingStyle == UITableViewCellEditingStyle.delete {
tasks.remove(at: indexPath.row)
tableView.reloadData()
}
}

Answer 1

Don't let the fact that you are a beginner keep you from using this powerful persistent store friend. CoreData is a big topic, books have been written on it, but it is something that works very well once you understand the core concepts of programming with it. It looks like you want to remove data that is populated in a UITableView and then save what you deleted into CoreData. Let's break down the steps and give you some examples to work with in your own project.
1) Remove data from your UITableView's datasource
2) Save NSManagedObject to CoreData
3) Delete row from UITableView
override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
if editingStyle == UITableViewCellEditingStyle.delete {
// 1)
let task = tasks.remove(at: indexPath.row)
// 2)
saveToCoreData(task: task)
// 3)
tableView.beginUpdates()
tableView.deleteRows(at: [indexPath], with: .fade)
tableView.endUpdates()
}
}
// Assuming your task is of type "`Task`". You should put whatever data type your task object actually is.
func saveToCoreData(task: Task) {
// Insert Into CoreData (very important)
let managedObject = NSEntityDescription.insertNewObject(forEntityName: "RemovedTask", into: self.context)
// assign values
managedObject.value = task.value
// Save CoreData Context (also, very important)
do {
self.context.save()
}
catch {
print("Could not save CoreData!")
}
}