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UITableViewCell, show delete button on swipe in ios

How do I get the delete button to show when swiping on a UITableViewCell? The event is never raised and the delete button never appears.

During startup in (-viewDidLoad or in storyboard) do:

self.tableView.allowsMultipleSelectionDuringEditing = NO;

Override to support conditional editing of the table view. This only needs to be implemented if you are going to be returning NO for some items. By default, all items are editable.

- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath {
    // Return YES if you want the specified item to be editable.
    return YES;
}

// Override to support editing the table view.
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
    if (editingStyle == UITableViewCellEditingStyleDelete) {
        //add code here for when you hit delete
    }    
}
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