UITableViewCell, show delete button on swipe

This code shows how to implement the delete.

#pragma mark - UITableViewDataSource

// Swipe to delete.
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (editingStyle == UITableViewCellEditingStyleDelete) {
        [_chats removeObjectAtIndex:indexPath.row];
        [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];
    }
}

Optionally, in your initialization override, add the line below to show the Edit button item:

self.navigationItem.leftBarButtonItem = self.editButtonItem;

Swift 4

func tableView(_ tableView: UITableView, editActionsForRowAt indexPath: IndexPath) -> [UITableViewRowAction]? {
    let delete = UITableViewRowAction(style: .destructive, title: "delete") { (action, indexPath) in
        // delete item at indexPath
    tableView.deleteRows(at: [indexPath], with: .fade)

    }
    return [delete]
}

Swift 4,5

To delete a cell on swipe there are two built in methods of UITableView.Write this method in TableView dataSource extension.

func tableView(_ tableView: UITableView, trailingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {
  let delete = deleteProperty(at: indexPath)
  return UISwipeActionsConfiguration(actions: [delete])
}

// Declare this method in UIViewController Main and modify according to your need

func deleteProperty(at indexpath: IndexPath) -> UIContextualAction {
  let action = UIContextualAction(style: .destructive, title: "Delete") { (action, view, completon) in
    self.yourArray.remove(at: indexpath) // Removing from array at selected index

    completon(true)
    action.backgroundColor = .red //cell background color
  }
  return action
}

If you're adopting diffable data sources, you'll have to move the delegate callbacks to a UITableViewDiffableDataSource subclass. For example:

class DataSource: UITableViewDiffableDataSource<SectionType, ItemType> {

    override func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
        return true
    }

    override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
        if editingStyle == .delete {
            if let identifierToDelete = itemIdentifier(for: indexPath) {
                var snapshot = self.snapshot()
                snapshot.deleteItems([identifierToDelete])
                apply(snapshot)
            }
        }
    }
}

SWIFT 5 : for iOS 13+

func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
        return true
  }
    
    
 func tableView(_ tableView: UITableView, trailingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {
        let deleteAction = UIContextualAction(style: .destructive, title: "Delete") {  (contextualAction, view, boolValue) in
            //Code I want to do here
        }
        
        let editAction = UIContextualAction(style: .destructive, title: "Edit") {  (contextualAction, view, boolValue) in
            //Code I want to do here
        }
        
        let swipeActions = UISwipeActionsConfiguration(actions: [deleteAction, editAction])
        
        return swipeActions
    }