How to delete cells from a table view?

I have an Edit button in my navigation bar, and I have an table view.

My edit button calls an -editAction method.

And then, I have this piece of code to delete a cell, but I don't know how I can make the edit button to call this code...or how the edit button can let the table view display those red delete circles for every cell, which then trigger this:

// Override to support editing the table view.
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
    if (editingStyle == UITableViewCellEditingStyleDelete) {
        // Delete the managed object at the given index path
        NSManagedObject *eventToDelete = [eventsArray objectAtIndex:indexPath.row];
        [managedObjectContext deleteObject:eventToDelete];

        // Update Event objects array and table view
        [eventsArray removeObject开发者_JAVA百科AtIndex:indexPath.row];
        [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:YES];

        // Commit the change
        NSError *error;
        if (![managedObjectContext save:&error]) {
            // Handle the error
        }
    } 
}

According to the UITableView class reference docs, the code:

tableView.editing = YES;

Should put the table into editing mode and display those red delete circles. Then when the user deletes a cell your data source method should be called.

You can also use [tableView setEditing:YES animated:YES]; for an animated effect

In your view controller's -viewDidLoad method add the Edit button:

self.navigationItem.rightBarButtonItem = self.editButtonItem;

This button will toggle the controller's editing mode, sending it -setEditing:animated: