Bookmark Button with core data in a TableView - ios

Question

Question:- I am having problem while deleting a row from core data. Whenever I perform the delete function, The values in the row are changed to 0 but the row still exist in Core database. How can I completely remove the row in below written code?
I have a tableView showing some list, each cell has a button with grey bookmark image as default.
When I click on bookmarkBtn, the button image is changed to blue image and the data is stored by coreData. After clicking it again, bookmarkBtn again changes to grey image and the entry in core data is supposed to be deleted.
//Code:- **when bookmarkBtn is clicked.**
#IBAction func btnClicked(_ sender: UIButton)
{
let position: CGPoint = sender.convert(CGPoint.zero, to: self.tableView)
let indexPath = self.tableView.indexPathForRow(at: position)!
sender.tag = indexPath.row
let cell: TableViewCell = self.tableView.cellForRow(at: indexPath) as! TableViewCell
// print("Favorite button tapped")
if sender.isSelected != true
{
cell.bookmarkBtn.setImage(UIImage(named: "bookmark_blue"), for: UIControlState.normal);
sender.isSelected = true;
saveItem(itemToSave:sender.tag)
self.bookmarkArrState.replaceObject(at: (indexPath.row), with:1);
}
else
{
cell.bookmarkBtn.setImage(UIImage(named: "bookmark_grey" ), for: UIControlState.normal);
sender.isSelected = false;
removeData(itemToDelete: sender.tag)
self.bookmarkArrState.replaceObject(at: (indexPath.row), with:0)
}
}
//Code:- **Saving values in CoreData**
func saveItem(itemToSave: Int){
let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
//**Note:** Here we are providing the entityName **`Entity`** that we have added in the model
let entity = NSEntityDescription.entity(forEntityName: "AddedBookmark", in: context)
let myItem = NSManagedObject(entity: entity!, insertInto: context)
myItem.setValue(itemToSave, forKey: "indexNo")
do {
try context.save()
}
catch{
print("There was an error in saving data")
}
}
//**Code:- Deleting Data when bookmarkBtn is clicked again**
func removeData(itemToDelete: Int)
{
let mngdCntxt = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
//**Note:** Here we are providing the entityName **`Entity`** that we have added in the model
let entity = NSEntityDescription.entity(forEntityName: "AddedBookmark", in: mngdCntxt)
let myItem = NSManagedObject(entity: entity!, insertInto: mngdCntxt)
if let dataAppDelegatde = UIApplication.shared.delegate as? AppDelegate {
let mngdCntxt = dataAppDelegatde.persistentContainer.viewContext
let fetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName: "AddedBookmark")
let predicate = NSPredicate(format: "indexNo = %i", Int(itemToDelete))
print("item selected :-\(itemToDelete)")
fetchRequest.predicate = predicate
do{
var result = try mngdCntxt.fetch(fetchRequest)
print(result.count)
print(fetchRequest)
if result.count > 0{
for object in result
{
print(object)
mngdCntxt.performAndWait {
mngdCntxt.delete(result[0] as! NSManagedObject)
mngdCntxt.refreshAllObjects()
}
}
}
do {
try mngdCntxt.save()
}
catch{
print("There was an error in saving data")
}
}
catch{
}
}
}