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iosxcodecore-dataswift3

Swift 3: How to delete the single record in the Core Data when a UIbutton is Pressed

I have a function, where I can add the Profile to the favourite list (which saves through Core Data) and when I want to mark it as Not Favourite, it should delete from the Core data and also from the TableList View (Favourite View Controller).

The code what I have so far, deletes all the records from the list instead deleting the specific record.

Please Find the code Below:-

 @IBAction func saveFav(_ sender: UIButton) {

   let propertyToCheck = sender.currentTitle!
    var proID = saved_id
    let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
    let task = FavProfile(context: context)

    switch propertyToCheck {
    case "Add to Favourite":
     // Link Task & Context
    task.busName = bussinessName
    task.profileID = Int32(id!)!
    print ("saved id is: - \(task.profileID)")
    print ("saved profile name is: - \(task.busName)")
    fav_remove_fav_button_label.setTitle("Remove From Favourite", for: .normal)

    // Save the data to coredata
    (UIApplication.shared.delegate as! AppDelegate).saveContext()

    let _ = navigationController?.popViewController(animated: true)

    let alert = UIAlertController(title: "Alert", message: "Added to your Favourite list", preferredStyle: UIAlertControllerStyle.alert)
    alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.default, handler: nil))
    self.present(alert, animated: true, completion: nil)

        case "Remove from Favourite":



            let fetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName: "FavProfile")
            let moc = getContext()
            let result = try? moc.fetch(fetchRequest)
            let resultData = result as! [FavProfile]

            for object in resultData {
                moc.delete(object)
            }

            do {
                try moc.save()
                print("saved!")
            } catch let error as NSError  {
                print("Could not save \(error), \(error.userInfo)")
            } catch {

            }




        let alert = UIAlertController(title: "Alert", message: "Removed from your Favourite list", preferredStyle: UIAlertControllerStyle.alert)
        alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.default, handler: nil))
        self.present(alert, animated: true, completion: nil)
      //  self.favtable.tableView.reloadData()


    default: break
    }
}

I dont know what I need to fix here that only deletes the specific record.

Thanks for the time and effort.

Screen 1, when i mark the profile as favourite:

enter image description here

Screen 2 when i mark same profile as not favourite :

enter image description here

screen 3, when i restart the app again:

enter image description here

I tried to mark the 2nd profile as not favourite, it does not update the tableview. and when i restart the app, it shows "Label"

Solution 
  •     let fetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName: "FavProfile")
    let predicate = NSPredicate(format: "profileID == %@", id as CVarArg)
    fetchRequest.predicate = predicate
    let moc = getContext()
    let result = try? moc.fetch(fetchRequest)
    let resultData = result as! [FavProfile]

    for object in resultData {
        moc.delete(object)
    }

    do {
        try moc.save()
        print("saved!")
    } catch let error as NSError  {
        print("Could not save \(error), \(error.userInfo)")
    }

    use predicate for profileID.